[{"status":"public","_id":"66640","publisher":"American Physical Society (APS)","user_id":"75127","volume":8,"citation":{"bibtex":"@article{Aßbrock_Sperling_Ares_2026, title={Quantum speedup from nonclassical polarization}, volume={8}, DOI={<a href=\"https://doi.org/10.1103/mflc-2mzq\">10.1103/mflc-2mzq</a>}, number={3L032018}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Aßbrock, Tim and Sperling, Jan and Ares, Laura}, year={2026} }","ama":"Aßbrock T, Sperling J, Ares L. Quantum speedup from nonclassical polarization. <i>Physical Review Research</i>. 2026;8(3). doi:<a href=\"https://doi.org/10.1103/mflc-2mzq\">10.1103/mflc-2mzq</a>","mla":"Aßbrock, Tim, et al. “Quantum Speedup from Nonclassical Polarization.” <i>Physical Review Research</i>, vol. 8, no. 3, L032018, American Physical Society (APS), 2026, doi:<a href=\"https://doi.org/10.1103/mflc-2mzq\">10.1103/mflc-2mzq</a>.","chicago":"Aßbrock, Tim, Jan Sperling, and Laura Ares. “Quantum Speedup from Nonclassical Polarization.” <i>Physical Review Research</i> 8, no. 3 (2026). <a href=\"https://doi.org/10.1103/mflc-2mzq\">https://doi.org/10.1103/mflc-2mzq</a>.","short":"T. Aßbrock, J. Sperling, L. Ares, Physical Review Research 8 (2026).","ieee":"T. Aßbrock, J. Sperling, and L. Ares, “Quantum speedup from nonclassical polarization,” <i>Physical Review Research</i>, vol. 8, no. 3, Art. no. L032018, 2026, doi: <a href=\"https://doi.org/10.1103/mflc-2mzq\">10.1103/mflc-2mzq</a>.","apa":"Aßbrock, T., Sperling, J., &#38; Ares, L. (2026). Quantum speedup from nonclassical polarization. <i>Physical Review Research</i>, <i>8</i>(3), Article L032018. <a href=\"https://doi.org/10.1103/mflc-2mzq\">https://doi.org/10.1103/mflc-2mzq</a>"},"title":"Quantum speedup from nonclassical polarization","year":"2026","publication_identifier":{"issn":["2643-1564"]},"author":[{"full_name":"Aßbrock, Tim","last_name":"Aßbrock","first_name":"Tim"},{"full_name":"Sperling, Jan","orcid":"0000-0002-5844-3205","first_name":"Jan","last_name":"Sperling","id":"75127"},{"full_name":"Ares, Laura","last_name":"Ares","first_name":"Laura"}],"publication_status":"published","date_updated":"2026-08-03T16:28:48Z","intvolume":"         8","article_number":"L032018","language":[{"iso":"eng"}],"doi":"10.1103/mflc-2mzq","issue":"3","publication":"Physical Review Research","abstract":[{"text":"<jats:p>\r\n                    We develop a framework for identifying nonclassical speedups in systems with polarization, likewise spin degrees of freedom. By confining the dynamics to the manifold of angular momentum coherent states, which act as the classical reference in this case, we compute the speed limit that bounds the rate of change of the state achievable without generating quantum coherence. A comparison with the unrestricted quantum speed limit enables the quantitative identification of speedups arising from polarization nonclassicality. We apply this framework to the cross-Kerr interaction, demonstrating a persistent speedup scaling as\r\n                    <a:math xmlns:a=\"http://www.w3.org/1998/Math/MathML\">\r\n                      <a:mrow>\r\n                        <a:mi mathvariant=\"script\">O</a:mi>\r\n                        <a:mo>(</a:mo>\r\n                        <a:msqrt>\r\n                          <a:mi>N</a:mi>\r\n                        </a:msqrt>\r\n                        <a:mo>)</a:mo>\r\n                      </a:mrow>\r\n                    </a:math>\r\n                    with the photon number\r\n                    <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\">\r\n                      <c:mi>N</c:mi>\r\n                    </c:math>\r\n                    , with a parity effect in favor of even photon numbers. The results establish polarization nonclassicality as a genuine dynamical resource, linking quantum coherence to quantum-enhanced evolution speeds in nonlinear photonic systems.\r\n                  </jats:p>","lang":"eng"}],"date_created":"2026-08-03T16:26:49Z","type":"journal_article","department":[{"_id":"623"},{"_id":"15"},{"_id":"170"},{"_id":"706"}]},{"citation":{"mla":"Castaños-Cervantes, Luis Octavio, et al. “Indefinite Causal Order in Cavity Quantum Electrodynamics.” <i>Physical Review Research</i>, vol. 8, no. 2, 023295, American Physical Society (APS), 2026, doi:<a href=\"https://doi.org/10.1103/wgr6-1g5m\">10.1103/wgr6-1g5m</a>.","bibtex":"@article{Castaños-Cervantes_Procopio Peña_Bartley_2026, title={Indefinite causal order in cavity quantum electrodynamics}, volume={8}, DOI={<a href=\"https://doi.org/10.1103/wgr6-1g5m\">10.1103/wgr6-1g5m</a>}, number={2023295}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Castaños-Cervantes, Luis Octavio and Procopio Peña, Lorenzo Manuel and Bartley, Tim J.}, year={2026} }","ama":"Castaños-Cervantes LO, Procopio Peña LM, Bartley TJ. Indefinite causal order in cavity quantum electrodynamics. <i>Physical Review Research</i>. 2026;8(2). doi:<a href=\"https://doi.org/10.1103/wgr6-1g5m\">10.1103/wgr6-1g5m</a>","ieee":"L. O. Castaños-Cervantes, L. M. Procopio Peña, and T. J. Bartley, “Indefinite causal order in cavity quantum electrodynamics,” <i>Physical Review Research</i>, vol. 8, no. 2, Art. no. 023295, 2026, doi: <a href=\"https://doi.org/10.1103/wgr6-1g5m\">10.1103/wgr6-1g5m</a>.","apa":"Castaños-Cervantes, L. O., Procopio Peña, L. M., &#38; Bartley, T. J. (2026). Indefinite causal order in cavity quantum electrodynamics. <i>Physical Review Research</i>, <i>8</i>(2), Article 023295. <a href=\"https://doi.org/10.1103/wgr6-1g5m\">https://doi.org/10.1103/wgr6-1g5m</a>","short":"L.O. Castaños-Cervantes, L.M. Procopio Peña, T.J. Bartley, Physical Review Research 8 (2026).","chicago":"Castaños-Cervantes, Luis Octavio, Lorenzo Manuel Procopio Peña, and Tim J. Bartley. “Indefinite Causal Order in Cavity Quantum Electrodynamics.” <i>Physical Review Research</i> 8, no. 2 (2026). <a href=\"https://doi.org/10.1103/wgr6-1g5m\">https://doi.org/10.1103/wgr6-1g5m</a>."},"status":"public","_id":"66075","publisher":"American Physical Society (APS)","user_id":"105816","volume":8,"publication":"Physical Review Research","issue":"2","abstract":[{"lang":"eng","text":"<jats:p>Indefinite causal order (ICO) has the potential to be a new resource for quantum information processing. In most of its experiments, ICO has been investigated in a photonic platform. Here, we investigate ICO in a cavity quantum electrodynamics system composed of two cavities. Our results show that ICO can create highly entangled states of two distant cavity fields that never interact directly independent of the initial (excited or ground) state of the atom. These entangled states can have the form of one- or two-photon NOON states. We show that ICO can interchange one photon between both cavities without changing the state of the atom, something that is impossible to achieve for two cavities in well-defined order. Furthermore, the vacuum Rabi oscillations either disappear or lose their sinusoidal form with ICO. Our results show the potential that ICO can offer in the paradigm of light-matter interaction for coherently controlling atom-field observables.</jats:p>"}],"date_created":"2026-06-29T08:08:42Z","type":"journal_article","title":"Indefinite causal order in cavity quantum electrodynamics","year":"2026","publication_identifier":{"issn":["2643-1564"]},"author":[{"full_name":"Castaños-Cervantes, Luis Octavio","first_name":"Luis Octavio","last_name":"Castaños-Cervantes"},{"full_name":"Procopio Peña, Lorenzo Manuel","first_name":"Lorenzo Manuel","last_name":"Procopio Peña","id":"105816"},{"full_name":"Bartley, Tim J.","first_name":"Tim J.","last_name":"Bartley"}],"date_updated":"2026-07-07T07:29:09Z","publication_status":"published","intvolume":"         8","article_type":"original","article_number":"023295","language":[{"iso":"eng"}],"doi":"10.1103/wgr6-1g5m"},{"user_id":"55907","volume":8,"_id":"66665","publisher":"American Physical Society (APS)","status":"public","oa":"1","project":[{"name":"TRR 142 - Project Area C","_id":"56"},{"_id":"53","name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"},{"name":"TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen Systemen: Eine theoretische Analyse","_id":"174"},{"_id":"52","name":"Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"citation":{"bibtex":"@article{Scharwald_Sharapova_2026, title={Characterization of spatial Schmidt modes in high-gain SU(1,1) interferometers}, volume={8}, DOI={<a href=\"https://doi.org/10.1103/ph64-ts39\">10.1103/ph64-ts39</a>}, number={3033139}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Scharwald, Dennis and Sharapova, Polina}, year={2026} }","ama":"Scharwald D, Sharapova P. Characterization of spatial Schmidt modes in high-gain SU(1,1) interferometers. <i>Physical Review Research</i>. 2026;8(3). doi:<a href=\"https://doi.org/10.1103/ph64-ts39\">10.1103/ph64-ts39</a>","mla":"Scharwald, Dennis, and Polina Sharapova. “Characterization of Spatial Schmidt Modes in High-Gain SU(1,1) Interferometers.” <i>Physical Review Research</i>, vol. 8, no. 3, 033139, American Physical Society (APS), 2026, doi:<a href=\"https://doi.org/10.1103/ph64-ts39\">10.1103/ph64-ts39</a>.","short":"D. Scharwald, P. Sharapova, Physical Review Research 8 (2026).","chicago":"Scharwald, Dennis, and Polina Sharapova. “Characterization of Spatial Schmidt Modes in High-Gain SU(1,1) Interferometers.” <i>Physical Review Research</i> 8, no. 3 (2026). <a href=\"https://doi.org/10.1103/ph64-ts39\">https://doi.org/10.1103/ph64-ts39</a>.","ieee":"D. Scharwald and P. Sharapova, “Characterization of spatial Schmidt modes in high-gain SU(1,1) interferometers,” <i>Physical Review Research</i>, vol. 8, no. 3, Art. no. 033139, 2026, doi: <a href=\"https://doi.org/10.1103/ph64-ts39\">10.1103/ph64-ts39</a>.","apa":"Scharwald, D., &#38; Sharapova, P. (2026). Characterization of spatial Schmidt modes in high-gain SU(1,1) interferometers. <i>Physical Review Research</i>, <i>8</i>(3), Article 033139. <a href=\"https://doi.org/10.1103/ph64-ts39\">https://doi.org/10.1103/ph64-ts39</a>"},"doi":"10.1103/ph64-ts39","article_number":"033139","main_file_link":[{"url":"https://journals.aps.org/prresearch/pdf/10.1103/ph64-ts39","open_access":"1"}],"language":[{"iso":"eng"}],"publication_status":"published","date_updated":"2026-08-12T14:29:44Z","article_type":"original","intvolume":"         8","title":"Characterization of spatial Schmidt modes in high-gain SU(1,1) interferometers","year":"2026","publication_identifier":{"issn":["2643-1564"]},"author":[{"id":"55907","full_name":"Scharwald, Dennis","first_name":"Dennis","orcid":"0009-0007-5654-5412","last_name":"Scharwald"},{"id":"60286","full_name":"Sharapova, Polina","last_name":"Sharapova","first_name":"Polina"}],"type":"journal_article","department":[{"_id":"975"},{"_id":"15"},{"_id":"623"},{"_id":"569"},{"_id":"170"},{"_id":"35"},{"_id":"429"},{"_id":"34"},{"_id":"502"}],"date_created":"2026-08-05T11:51:21Z","abstract":[{"text":"Multimode quantum light has promising applications in many areas of physics, such as quantum communications and quantum computing. However, its multimode nature also makes it challenging to measure its properties. Recently [I. Barakat et al., Optica Quantum 3, 36 (2025)], a technique for the simultaneous measurement of squeezing of multiple broadband modes based on a phase-sensitive amplification approach was experimentally implemented using a setup that effectively corresponds to an SU(1,1) interferometer. Here, we aim to provide a complete theoretical analysis of the modal structure of (generally unbalanced) SU(1,1) interferometers and a detailed theoretical formal derivation of the framework for this technique. Utilizing the joint Schmidt decomposition of the transfer functions, we investigate the shape and phase profiles of the modes of the SU(1,1) interferometer and its components [parametric down-conversion (PDC) sections] for different parametric gain regimes. We discover a complicated interplay between the PDC modes and the modes of the entire interferometer, and analyze it by using their overlap coefficients as a similarity measure. Finally, we develop a rigorous processing method for the aforementioned multimode squeezing measurement technique and discuss necessary approximations to make this method experimentally feasible.","lang":"eng"}],"issue":"3","publication":"Physical Review Research"},{"language":[{"iso":"eng"}],"article_number":"013141","doi":"10.1103/physrevresearch.7.013141","author":[{"full_name":"Ali, Usman","first_name":"Usman","last_name":"Ali"},{"full_name":"Holthaus, Martin","last_name":"Holthaus","first_name":"Martin"},{"id":"344","full_name":"Meier, Torsten","orcid":"0000-0001-8864-2072","last_name":"Meier","first_name":"Torsten"}],"publication_identifier":{"issn":["2643-1564"]},"title":"Wave packet dynamics in parabolic optical lattices: From Bloch oscillations to long-range dynamical tunneling","year":"2025","intvolume":"         7","date_updated":"2025-12-05T09:37:10Z","publication_status":"published","date_created":"2025-12-05T09:36:31Z","department":[{"_id":"15"},{"_id":"170"},{"_id":"293"},{"_id":"230"},{"_id":"35"}],"type":"journal_article","issue":"1","publication":"Physical Review Research","abstract":[{"text":"<jats:p>We investigate the dynamics of wave packets in a parabolic optical lattice formed by combining an optical lattice with a global parabolic trap. Our study examines the phase space representation of the system's eigenstates by comparing them to the classical phase space of a pendulum, to which the system effectively maps. The analysis reveals that quantum states can exhibit mixed dynamics by straddling the separatrix. A key finding is that the dynamics around the separatrix enables the controlled creation of highly nonclassical states, distinguishing them from the classical oscillatory or rotational dynamics of the pendulum. By considering a finite momentum of the initial wave packet, we demonstrate various dynamical regimes. Furthermore, a slight energy mismatch between nearly degenerate states localized at opposite turning points of the trap potential results in controlled long-range dynamical tunneling. These results can be interpreted as quantum beating between a clockwise rotating and a counterclockwise rotating pendulum.</jats:p>","lang":"eng"}],"publisher":"American Physical Society (APS)","_id":"62912","volume":7,"user_id":"16199","status":"public","citation":{"apa":"Ali, U., Holthaus, M., &#38; Meier, T. (2025). Wave packet dynamics in parabolic optical lattices: From Bloch oscillations to long-range dynamical tunneling. <i>Physical Review Research</i>, <i>7</i>(1), Article 013141. <a href=\"https://doi.org/10.1103/physrevresearch.7.013141\">https://doi.org/10.1103/physrevresearch.7.013141</a>","mla":"Ali, Usman, et al. “Wave Packet Dynamics in Parabolic Optical Lattices: From Bloch Oscillations to Long-Range Dynamical Tunneling.” <i>Physical Review Research</i>, vol. 7, no. 1, 013141, American Physical Society (APS), 2025, doi:<a href=\"https://doi.org/10.1103/physrevresearch.7.013141\">10.1103/physrevresearch.7.013141</a>.","ieee":"U. Ali, M. Holthaus, and T. Meier, “Wave packet dynamics in parabolic optical lattices: From Bloch oscillations to long-range dynamical tunneling,” <i>Physical Review Research</i>, vol. 7, no. 1, Art. no. 013141, 2025, doi: <a href=\"https://doi.org/10.1103/physrevresearch.7.013141\">10.1103/physrevresearch.7.013141</a>.","chicago":"Ali, Usman, Martin Holthaus, and Torsten Meier. “Wave Packet Dynamics in Parabolic Optical Lattices: From Bloch Oscillations to Long-Range Dynamical Tunneling.” <i>Physical Review Research</i> 7, no. 1 (2025). <a href=\"https://doi.org/10.1103/physrevresearch.7.013141\">https://doi.org/10.1103/physrevresearch.7.013141</a>.","short":"U. Ali, M. Holthaus, T. Meier, Physical Review Research 7 (2025).","ama":"Ali U, Holthaus M, Meier T. Wave packet dynamics in parabolic optical lattices: From Bloch oscillations to long-range dynamical tunneling. <i>Physical Review Research</i>. 2025;7(1). doi:<a href=\"https://doi.org/10.1103/physrevresearch.7.013141\">10.1103/physrevresearch.7.013141</a>","bibtex":"@article{Ali_Holthaus_Meier_2025, title={Wave packet dynamics in parabolic optical lattices: From Bloch oscillations to long-range dynamical tunneling}, volume={7}, DOI={<a href=\"https://doi.org/10.1103/physrevresearch.7.013141\">10.1103/physrevresearch.7.013141</a>}, number={1013141}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Ali, Usman and Holthaus, Martin and Meier, Torsten}, year={2025} }"}},{"intvolume":"         7","publication_status":"published","date_updated":"2025-12-05T08:48:02Z","publication_identifier":{"issn":["2643-1564"]},"author":[{"first_name":"Santiago","last_name":"Bermúdez-Feijóo","full_name":"Bermúdez-Feijóo, Santiago"},{"last_name":"Zubizarreta Casalengua","first_name":"Eduardo","full_name":"Zubizarreta Casalengua, Eduardo"},{"first_name":"Kai","last_name":"Müller","full_name":"Müller, Kai"},{"full_name":"Jöns, Klaus D.","first_name":"Klaus D.","last_name":"Jöns"}],"year":"2025","title":"Spectral correlations of dynamical resonance fluorescence","doi":"10.1103/jmy9-bd3l","language":[{"iso":"eng"}],"article_number":"033296","abstract":[{"lang":"eng","text":"<jats:p>Frequency-filtered photon correlations have been proven to be extremely useful in grasping how the detection process alters photon statistics. Harnessing the spectral correlations also permits refinement of the emission and unraveling of previously hidden strong correlations in a plethora of quantum-optical systems under continuous-wave excitation. In this work, we investigate such correlations for time-dependent excitation and develop a methodology to compute efficiently time-integrated correlations, which are at the heart of the photon-counting theory, and subsequently apply it to analyze the photon emission of pulsed systems. By combining this formalism with the —which facilitates frequency-resolved correlations—we demonstrate how spectral filtering enhances single-photon purity and suppresses multiphoton noise in time-bin-encoded quantum states. Specifically, filtering the central spectral peak of a dynamically driven two-level system boosts temporal coherence and improves the fidelity of time-bin entanglement preparation, even under conditions favoring multiphoton emission. These results establish spectral filtering as a critical tool for tailoring photon statistics in pulsed quantum light sources.</jats:p>"}],"issue":"3","publication":"Physical Review Research","type":"journal_article","date_created":"2025-12-05T08:47:30Z","status":"public","volume":7,"user_id":"104310","publisher":"American Physical Society (APS)","_id":"62910","citation":{"apa":"Bermúdez-Feijóo, S., Zubizarreta Casalengua, E., Müller, K., &#38; Jöns, K. D. (2025). Spectral correlations of dynamical resonance fluorescence. <i>Physical Review Research</i>, <i>7</i>(3), Article 033296. <a href=\"https://doi.org/10.1103/jmy9-bd3l\">https://doi.org/10.1103/jmy9-bd3l</a>","ieee":"S. Bermúdez-Feijóo, E. Zubizarreta Casalengua, K. Müller, and K. D. Jöns, “Spectral correlations of dynamical resonance fluorescence,” <i>Physical Review Research</i>, vol. 7, no. 3, Art. no. 033296, 2025, doi: <a href=\"https://doi.org/10.1103/jmy9-bd3l\">10.1103/jmy9-bd3l</a>.","chicago":"Bermúdez-Feijóo, Santiago, Eduardo Zubizarreta Casalengua, Kai Müller, and Klaus D. Jöns. “Spectral Correlations of Dynamical Resonance Fluorescence.” <i>Physical Review Research</i> 7, no. 3 (2025). <a href=\"https://doi.org/10.1103/jmy9-bd3l\">https://doi.org/10.1103/jmy9-bd3l</a>.","short":"S. Bermúdez-Feijóo, E. Zubizarreta Casalengua, K. Müller, K.D. Jöns, Physical Review Research 7 (2025).","mla":"Bermúdez-Feijóo, Santiago, et al. “Spectral Correlations of Dynamical Resonance Fluorescence.” <i>Physical Review Research</i>, vol. 7, no. 3, 033296, American Physical Society (APS), 2025, doi:<a href=\"https://doi.org/10.1103/jmy9-bd3l\">10.1103/jmy9-bd3l</a>.","ama":"Bermúdez-Feijóo S, Zubizarreta Casalengua E, Müller K, Jöns KD. Spectral correlations of dynamical resonance fluorescence. <i>Physical Review Research</i>. 2025;7(3). doi:<a href=\"https://doi.org/10.1103/jmy9-bd3l\">10.1103/jmy9-bd3l</a>","bibtex":"@article{Bermúdez-Feijóo_Zubizarreta Casalengua_Müller_Jöns_2025, title={Spectral correlations of dynamical resonance fluorescence}, volume={7}, DOI={<a href=\"https://doi.org/10.1103/jmy9-bd3l\">10.1103/jmy9-bd3l</a>}, number={3033296}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Bermúdez-Feijóo, Santiago and Zubizarreta Casalengua, Eduardo and Müller, Kai and Jöns, Klaus D.}, year={2025} }"}},{"citation":{"mla":"Kopylov, Denis A., et al. “Spectral and Temporal Properties of Type-II Parametric down-Conversion: The Impact of Losses during State Generation.” <i>Physical Review Research</i>, vol. 7, no. 3, 033122, American Physical Society (APS), 2025, doi:<a href=\"https://doi.org/10.1103/zp72-7qwl\">10.1103/zp72-7qwl</a>.","ama":"Kopylov DA, Stefszky M, Meier T, Silberhorn C, Sharapova PR. Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation. <i>Physical Review Research</i>. 2025;7(3). doi:<a href=\"https://doi.org/10.1103/zp72-7qwl\">10.1103/zp72-7qwl</a>","bibtex":"@article{Kopylov_Stefszky_Meier_Silberhorn_Sharapova_2025, title={Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation}, volume={7}, DOI={<a href=\"https://doi.org/10.1103/zp72-7qwl\">10.1103/zp72-7qwl</a>}, number={3033122}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Kopylov, Denis A. and Stefszky, Michael and Meier, Torsten and Silberhorn, Christine and Sharapova, Polina R.}, year={2025} }","apa":"Kopylov, D. A., Stefszky, M., Meier, T., Silberhorn, C., &#38; Sharapova, P. R. (2025). Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation. <i>Physical Review Research</i>, <i>7</i>(3), Article 033122. <a href=\"https://doi.org/10.1103/zp72-7qwl\">https://doi.org/10.1103/zp72-7qwl</a>","ieee":"D. A. Kopylov, M. Stefszky, T. Meier, C. Silberhorn, and P. R. Sharapova, “Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation,” <i>Physical Review Research</i>, vol. 7, no. 3, Art. no. 033122, 2025, doi: <a href=\"https://doi.org/10.1103/zp72-7qwl\">10.1103/zp72-7qwl</a>.","chicago":"Kopylov, Denis A., Michael Stefszky, Torsten Meier, Christine Silberhorn, and Polina R. Sharapova. “Spectral and Temporal Properties of Type-II Parametric down-Conversion: The Impact of Losses during State Generation.” <i>Physical Review Research</i> 7, no. 3 (2025). <a href=\"https://doi.org/10.1103/zp72-7qwl\">https://doi.org/10.1103/zp72-7qwl</a>.","short":"D.A. Kopylov, M. Stefszky, T. Meier, C. Silberhorn, P.R. Sharapova, Physical Review Research 7 (2025)."},"project":[{"_id":"266","name":"PhoQC: Photonisches Quantencomputing"},{"name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"},{"_id":"56","name":"TRR 142 - Project Area C"},{"_id":"174","name":"TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen Systemen: Eine theoretische Analyse"}],"publisher":"American Physical Society (APS)","_id":"62911","user_id":"16199","volume":7,"status":"public","date_created":"2025-12-05T09:33:36Z","type":"journal_article","department":[{"_id":"15"},{"_id":"569"},{"_id":"170"},{"_id":"293"},{"_id":"288"},{"_id":"230"},{"_id":"623"},{"_id":"429"},{"_id":"35"}],"publication":"Physical Review Research","issue":"3","abstract":[{"text":"<jats:p>In this paper, we theoretically study the spectral and temporal properties of pulsed spontaneous parametric down-conversion (SPDC) generated in lossy waveguides. Our theoretical approach is based on the formalism of Gaussian states and the Langevin equation, which is elaborated for weak parametric down-conversion and photon-number-unresolved click detection. Using the example of frequency-degenerate type-II SPDC generated under the pump-idler group-velocity-matching condition, we show how the joint-spectral intensity, mode structure, normalized second-order correlation function, and Hong-Ou-Mandel interference pattern depend on internal losses of the SPDC process. We found that the joint-spectral intensity is almost insensitive to internal losses, while the second-order correlation function shows a strong dependence on them, being different for the signal and idler beams in the presence of internal losses. Based on the sensitivity of the normalized second-order correlation function, we show how its measurement can be used to experimentally determine internal losses.</jats:p>","lang":"eng"}],"article_number":"033122","language":[{"iso":"eng"}],"doi":"10.1103/zp72-7qwl","title":"Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation","year":"2025","author":[{"full_name":"Kopylov, Denis A.","last_name":"Kopylov","first_name":"Denis A."},{"id":"42777","full_name":"Stefszky, Michael","first_name":"Michael","last_name":"Stefszky"},{"last_name":"Meier","orcid":"0000-0001-8864-2072","first_name":"Torsten","full_name":"Meier, Torsten","id":"344"},{"first_name":"Christine","last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263"},{"id":"60286","full_name":"Sharapova, Polina R.","first_name":"Polina R.","last_name":"Sharapova"}],"publication_identifier":{"issn":["2643-1564"]},"date_updated":"2025-12-05T09:55:22Z","publication_status":"published","intvolume":"         7"},{"citation":{"short":"D.A. Kopylov, C. Offen, L. Ares, B.E. Wembe Moafo, S. Ober-Blöbaum, T. Meier, P.R. Sharapova, J. Sperling, Physical Review Research 7 (2025).","chicago":"Kopylov, Denis A., Christian Offen, Laura Ares, Boris Edgar Wembe Moafo, Sina Ober-Blöbaum, Torsten Meier, Polina R. Sharapova, and Jan Sperling. “Multiphoton, Multimode State Classification for Nonlinear Optical Circuits.” <i>Physical Review Research</i> 7, no. 3 (2025). <a href=\"https://doi.org/10.1103/sv6z-v1gk\">https://doi.org/10.1103/sv6z-v1gk</a>.","apa":"Kopylov, D. A., Offen, C., Ares, L., Wembe Moafo, B. E., Ober-Blöbaum, S., Meier, T., Sharapova, P. R., &#38; Sperling, J. (2025). Multiphoton, multimode state classification for nonlinear optical circuits. <i>Physical Review Research</i>, <i>7</i>(3), Article 033062. <a href=\"https://doi.org/10.1103/sv6z-v1gk\">https://doi.org/10.1103/sv6z-v1gk</a>","ieee":"D. A. Kopylov <i>et al.</i>, “Multiphoton, multimode state classification for nonlinear optical circuits,” <i>Physical Review Research</i>, vol. 7, no. 3, Art. no. 033062, 2025, doi: <a href=\"https://doi.org/10.1103/sv6z-v1gk\">10.1103/sv6z-v1gk</a>.","ama":"Kopylov DA, Offen C, Ares L, et al. Multiphoton, multimode state classification for nonlinear optical circuits. <i>Physical Review Research</i>. 2025;7(3). doi:<a href=\"https://doi.org/10.1103/sv6z-v1gk\">10.1103/sv6z-v1gk</a>","bibtex":"@article{Kopylov_Offen_Ares_Wembe Moafo_Ober-Blöbaum_Meier_Sharapova_Sperling_2025, title={Multiphoton, multimode state classification for nonlinear optical circuits}, volume={7}, DOI={<a href=\"https://doi.org/10.1103/sv6z-v1gk\">10.1103/sv6z-v1gk</a>}, number={3033062}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Kopylov, Denis A. and Offen, Christian and Ares, Laura and Wembe Moafo, Boris Edgar and Ober-Blöbaum, Sina and Meier, Torsten and Sharapova, Polina R. and Sperling, Jan}, year={2025} }","mla":"Kopylov, Denis A., et al. “Multiphoton, Multimode State Classification for Nonlinear Optical Circuits.” <i>Physical Review Research</i>, vol. 7, no. 3, 033062, American Physical Society (APS), 2025, doi:<a href=\"https://doi.org/10.1103/sv6z-v1gk\">10.1103/sv6z-v1gk</a>."},"project":[{"name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"},{"name":"TRR 142 - Project Area C","_id":"56"},{"_id":"174","name":"TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen Systemen: Eine theoretische Analyse"},{"name":"PhoQC: Photonisches Quantencomputing","_id":"266"}],"status":"public","_id":"62980","publisher":"American Physical Society (APS)","user_id":"16199","volume":7,"issue":"3","publication":"Physical Review Research","abstract":[{"lang":"eng","text":"<jats:p>We introduce a new classification of multimode states with a fixed number of photons. This classification is based on the factorizability of homogeneous multivariate polynomials and is invariant under unitary transformations. The classes physically correspond to field excitations in terms of single and multiple photons, each of which is in an arbitrary irreducible superposition of quantized modes. We further show how the transitions between classes are rendered possible by photon addition, photon subtraction, and photon-projection nonlinearities. We explicitly put forward a design for a multilayer interferometer in which the states for different classes can be generated with state-of-the-art experimental techniques. Limitations of the proposed designs are analyzed using the introduced classification, providing a benchmark for the robustness of certain states and classes.</jats:p>"}],"date_created":"2025-12-09T09:08:39Z","type":"journal_article","department":[{"_id":"15"},{"_id":"569"},{"_id":"170"},{"_id":"293"},{"_id":"706"},{"_id":"636"},{"_id":"35"},{"_id":"230"},{"_id":"429"},{"_id":"623"}],"title":"Multiphoton, multimode state classification for nonlinear optical circuits","year":"2025","publication_identifier":{"issn":["2643-1564"]},"author":[{"full_name":"Kopylov, Denis A.","last_name":"Kopylov","first_name":"Denis A."},{"full_name":"Offen, Christian","first_name":"Christian","orcid":"0000-0002-5940-8057","last_name":"Offen","id":"85279"},{"full_name":"Ares, Laura","first_name":"Laura","last_name":"Ares"},{"last_name":"Wembe Moafo","first_name":"Boris Edgar","full_name":"Wembe Moafo, Boris Edgar","id":"95394"},{"id":"16494","first_name":"Sina","last_name":"Ober-Blöbaum","full_name":"Ober-Blöbaum, Sina"},{"orcid":"0000-0001-8864-2072","last_name":"Meier","first_name":"Torsten","full_name":"Meier, Torsten","id":"344"},{"id":"60286","full_name":"Sharapova, Polina R.","first_name":"Polina R.","last_name":"Sharapova"},{"full_name":"Sperling, Jan","orcid":"0000-0002-5844-3205","first_name":"Jan","last_name":"Sperling","id":"75127"}],"publication_status":"published","date_updated":"2025-12-09T09:10:01Z","intvolume":"         7","article_number":"033062","language":[{"iso":"eng"}],"doi":"10.1103/sv6z-v1gk"},{"citation":{"mla":"Bianchi, Luca, et al. “Predetection Squeezing as a Resource for High-Dimensional Bell-State Measurements.” <i>Physical Review Research</i>, vol. 7, no. 2, 023038, American Physical Society (APS), 2025, doi:<a href=\"https://doi.org/10.1103/physrevresearch.7.023038\">10.1103/physrevresearch.7.023038</a>.","apa":"Bianchi, L., Marconi, C., Sperling, J., &#38; Bacco, D. (2025). Predetection squeezing as a resource for high-dimensional Bell-state measurements. <i>Physical Review Research</i>, <i>7</i>(2), Article 023038. <a href=\"https://doi.org/10.1103/physrevresearch.7.023038\">https://doi.org/10.1103/physrevresearch.7.023038</a>","ieee":"L. Bianchi, C. Marconi, J. Sperling, and D. Bacco, “Predetection squeezing as a resource for high-dimensional Bell-state measurements,” <i>Physical Review Research</i>, vol. 7, no. 2, Art. no. 023038, 2025, doi: <a href=\"https://doi.org/10.1103/physrevresearch.7.023038\">10.1103/physrevresearch.7.023038</a>.","short":"L. Bianchi, C. Marconi, J. Sperling, D. Bacco, Physical Review Research 7 (2025).","ama":"Bianchi L, Marconi C, Sperling J, Bacco D. Predetection squeezing as a resource for high-dimensional Bell-state measurements. <i>Physical Review Research</i>. 2025;7(2). doi:<a href=\"https://doi.org/10.1103/physrevresearch.7.023038\">10.1103/physrevresearch.7.023038</a>","chicago":"Bianchi, Luca, Carlo Marconi, Jan Sperling, and Davide Bacco. “Predetection Squeezing as a Resource for High-Dimensional Bell-State Measurements.” <i>Physical Review Research</i> 7, no. 2 (2025). <a href=\"https://doi.org/10.1103/physrevresearch.7.023038\">https://doi.org/10.1103/physrevresearch.7.023038</a>.","bibtex":"@article{Bianchi_Marconi_Sperling_Bacco_2025, title={Predetection squeezing as a resource for high-dimensional Bell-state measurements}, volume={7}, DOI={<a href=\"https://doi.org/10.1103/physrevresearch.7.023038\">10.1103/physrevresearch.7.023038</a>}, number={2023038}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Bianchi, Luca and Marconi, Carlo and Sperling, Jan and Bacco, Davide}, year={2025} }"},"_id":"63021","publisher":"American Physical Society (APS)","volume":7,"user_id":"75127","status":"public","date_created":"2025-12-10T13:34:53Z","department":[{"_id":"623"},{"_id":"15"},{"_id":"170"},{"_id":"706"},{"_id":"429"}],"type":"journal_article","publication":"Physical Review Research","issue":"2","abstract":[{"lang":"eng","text":"<jats:p>Bell measurements, entailing the projection onto one of the Bell states, play a key role in quantum information and communication, where the outcome of a variety of protocols crucially depends on the success probability of such measurements. Although in the case of qubit systems, Bell measurements can be implemented using only linear optical components, the same result is no longer true for qudits, where at least the use of ancillary photons is required. In order to circumvent this limitation, one possibility is to introduce nonlinear effects. In this work, we adopt the latter approach and propose a scalable Bell measurement scheme for high-dimensional states, exploiting multiple squeezer devices applied to a linear optical circuit for discriminating the different Bell states. Our approach does not require ancillary photons, is not limited by the dimension of the quantum states, and is experimentally scalable, thus paving the way toward the realization of an effective high-dimensional Bell measurement.</jats:p>"}],"language":[{"iso":"eng"}],"article_number":"023038","doi":"10.1103/physrevresearch.7.023038","publication_identifier":{"issn":["2643-1564"]},"author":[{"full_name":"Bianchi, Luca","last_name":"Bianchi","first_name":"Luca"},{"first_name":"Carlo","last_name":"Marconi","full_name":"Marconi, Carlo"},{"id":"75127","full_name":"Sperling, Jan","orcid":"0000-0002-5844-3205","last_name":"Sperling","first_name":"Jan"},{"last_name":"Bacco","first_name":"Davide","full_name":"Bacco, Davide"}],"year":"2025","title":"Predetection squeezing as a resource for high-dimensional Bell-state measurements","intvolume":"         7","publication_status":"published","date_updated":"2025-12-10T13:36:11Z"},{"date_created":"2025-12-04T12:19:04Z","type":"journal_article","department":[{"_id":"623"},{"_id":"15"},{"_id":"429"},{"_id":"642"}],"publication":"Physical Review Research","issue":"3","abstract":[{"lang":"eng","text":"<jats:p>Frequency-filtered photon correlations have been proven to be extremely useful in grasping how the detection process alters photon statistics. Harnessing the spectral correlations also permits refinement of the emission and unraveling of previously hidden strong correlations in a plethora of quantum-optical systems under continuous-wave excitation. In this work, we investigate such correlations for time-dependent excitation and develop a methodology to compute efficiently time-integrated correlations, which are at the heart of the photon-counting theory, and subsequently apply it to analyze the photon emission of pulsed systems. By combining this formalism with the —which facilitates frequency-resolved correlations—we demonstrate how spectral filtering enhances single-photon purity and suppresses multiphoton noise in time-bin-encoded quantum states. Specifically, filtering the central spectral peak of a dynamically driven two-level system boosts temporal coherence and improves the fidelity of time-bin entanglement preparation, even under conditions favoring multiphoton emission. These results establish spectral filtering as a critical tool for tailoring photon statistics in pulsed quantum light sources.</jats:p>"}],"article_number":"033296","language":[{"iso":"eng"}],"doi":"10.1103/jmy9-bd3l","year":"2025","title":"Spectral correlations of dynamical resonance fluorescence","publication_identifier":{"issn":["2643-1564"]},"author":[{"full_name":"Bermúdez-Feijóo, Santiago","last_name":"Bermúdez-Feijóo","first_name":"Santiago"},{"first_name":"Eduardo","last_name":"Zubizarreta Casalengua","full_name":"Zubizarreta Casalengua, Eduardo"},{"full_name":"Müller, Kai","last_name":"Müller","first_name":"Kai"},{"full_name":"Jöns, Klaus","first_name":"Klaus","last_name":"Jöns","id":"85353"}],"date_updated":"2025-12-11T12:52:24Z","publication_status":"published","intvolume":"         7","citation":{"short":"S. Bermúdez-Feijóo, E. Zubizarreta Casalengua, K. Müller, K. Jöns, Physical Review Research 7 (2025).","chicago":"Bermúdez-Feijóo, Santiago, Eduardo Zubizarreta Casalengua, Kai Müller, and Klaus Jöns. “Spectral Correlations of Dynamical Resonance Fluorescence.” <i>Physical Review Research</i> 7, no. 3 (2025). <a href=\"https://doi.org/10.1103/jmy9-bd3l\">https://doi.org/10.1103/jmy9-bd3l</a>.","apa":"Bermúdez-Feijóo, S., Zubizarreta Casalengua, E., Müller, K., &#38; Jöns, K. (2025). Spectral correlations of dynamical resonance fluorescence. <i>Physical Review Research</i>, <i>7</i>(3), Article 033296. <a href=\"https://doi.org/10.1103/jmy9-bd3l\">https://doi.org/10.1103/jmy9-bd3l</a>","ieee":"S. Bermúdez-Feijóo, E. Zubizarreta Casalengua, K. Müller, and K. Jöns, “Spectral correlations of dynamical resonance fluorescence,” <i>Physical Review Research</i>, vol. 7, no. 3, Art. no. 033296, 2025, doi: <a href=\"https://doi.org/10.1103/jmy9-bd3l\">10.1103/jmy9-bd3l</a>.","ama":"Bermúdez-Feijóo S, Zubizarreta Casalengua E, Müller K, Jöns K. Spectral correlations of dynamical resonance fluorescence. <i>Physical Review Research</i>. 2025;7(3). doi:<a href=\"https://doi.org/10.1103/jmy9-bd3l\">10.1103/jmy9-bd3l</a>","bibtex":"@article{Bermúdez-Feijóo_Zubizarreta Casalengua_Müller_Jöns_2025, title={Spectral correlations of dynamical resonance fluorescence}, volume={7}, DOI={<a href=\"https://doi.org/10.1103/jmy9-bd3l\">10.1103/jmy9-bd3l</a>}, number={3033296}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Bermúdez-Feijóo, Santiago and Zubizarreta Casalengua, Eduardo and Müller, Kai and Jöns, Klaus}, year={2025} }","mla":"Bermúdez-Feijóo, Santiago, et al. “Spectral Correlations of Dynamical Resonance Fluorescence.” <i>Physical Review Research</i>, vol. 7, no. 3, 033296, American Physical Society (APS), 2025, doi:<a href=\"https://doi.org/10.1103/jmy9-bd3l\">10.1103/jmy9-bd3l</a>."},"publisher":"American Physical Society (APS)","_id":"62859","user_id":"48188","volume":7,"status":"public"},{"language":[{"iso":"eng"}],"article_number":"033152","doi":"10.1103/v24q-sl6n","publication_identifier":{"issn":["2643-1564"]},"author":[{"id":"88242","first_name":"Laura Maria","last_name":"Serino","full_name":"Serino, Laura Maria"},{"full_name":"Chesi, Giovanni","first_name":"Giovanni","last_name":"Chesi"},{"full_name":"Brecht, Benjamin","orcid":"0000-0003-4140-0556 ","first_name":"Benjamin","last_name":"Brecht","id":"27150"},{"full_name":"Maccone, Lorenzo","last_name":"Maccone","first_name":"Lorenzo"},{"full_name":"Macchiavello, Chiara","first_name":"Chiara","last_name":"Macchiavello"},{"id":"26263","last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine"}],"title":"Complementarity-based complementarity: The choice of mutually unbiased observables shapes quantum uncertainty relations","year":"2025","intvolume":"         7","article_type":"original","date_updated":"2025-12-18T16:05:45Z","publication_status":"published","date_created":"2025-12-18T16:04:45Z","department":[{"_id":"15"},{"_id":"623"}],"type":"journal_article","issue":"3","publication":"Physical Review Research","abstract":[{"text":"<jats:p>Quantum uncertainty relations impose fundamental limits on the joint knowledge that can be acquired from complementary observables: Perfect knowledge of a quantum state in one basis implies maximal indetermination in all other mutually unbiased bases (MUBs). Uncertainty relations derived from joint properties of the MUBs are generally assumed to be uniform, irrespective of the specific observables chosen within a set. In this work, we demonstrate instead that the uncertainty relations can depend on the choice of observables. Through both experimental observation and numerical methods, we show that selecting different sets of three MUBs in a five-dimensional quantum system results in distinct uncertainty bounds, i.e., in varying degrees of complementarity, in terms of both entropy and variance.</jats:p>","lang":"eng"}],"_id":"63213","publisher":"American Physical Society (APS)","volume":7,"user_id":"27150","status":"public","citation":{"ama":"Serino LM, Chesi G, Brecht B, Maccone L, Macchiavello C, Silberhorn C. Complementarity-based complementarity: The choice of mutually unbiased observables shapes quantum uncertainty relations. <i>Physical Review Research</i>. 2025;7(3). doi:<a href=\"https://doi.org/10.1103/v24q-sl6n\">10.1103/v24q-sl6n</a>","short":"L.M. Serino, G. Chesi, B. Brecht, L. Maccone, C. Macchiavello, C. Silberhorn, Physical Review Research 7 (2025).","chicago":"Serino, Laura Maria, Giovanni Chesi, Benjamin Brecht, Lorenzo Maccone, Chiara Macchiavello, and Christine Silberhorn. “Complementarity-Based Complementarity: The Choice of Mutually Unbiased Observables Shapes Quantum Uncertainty Relations.” <i>Physical Review Research</i> 7, no. 3 (2025). <a href=\"https://doi.org/10.1103/v24q-sl6n\">https://doi.org/10.1103/v24q-sl6n</a>.","bibtex":"@article{Serino_Chesi_Brecht_Maccone_Macchiavello_Silberhorn_2025, title={Complementarity-based complementarity: The choice of mutually unbiased observables shapes quantum uncertainty relations}, volume={7}, DOI={<a href=\"https://doi.org/10.1103/v24q-sl6n\">10.1103/v24q-sl6n</a>}, number={3033152}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Serino, Laura Maria and Chesi, Giovanni and Brecht, Benjamin and Maccone, Lorenzo and Macchiavello, Chiara and Silberhorn, Christine}, year={2025} }","apa":"Serino, L. M., Chesi, G., Brecht, B., Maccone, L., Macchiavello, C., &#38; Silberhorn, C. (2025). Complementarity-based complementarity: The choice of mutually unbiased observables shapes quantum uncertainty relations. <i>Physical Review Research</i>, <i>7</i>(3), Article 033152. <a href=\"https://doi.org/10.1103/v24q-sl6n\">https://doi.org/10.1103/v24q-sl6n</a>","mla":"Serino, Laura Maria, et al. “Complementarity-Based Complementarity: The Choice of Mutually Unbiased Observables Shapes Quantum Uncertainty Relations.” <i>Physical Review Research</i>, vol. 7, no. 3, 033152, American Physical Society (APS), 2025, doi:<a href=\"https://doi.org/10.1103/v24q-sl6n\">10.1103/v24q-sl6n</a>.","ieee":"L. M. Serino, G. Chesi, B. Brecht, L. Maccone, C. Macchiavello, and C. Silberhorn, “Complementarity-based complementarity: The choice of mutually unbiased observables shapes quantum uncertainty relations,” <i>Physical Review Research</i>, vol. 7, no. 3, Art. no. 033152, 2025, doi: <a href=\"https://doi.org/10.1103/v24q-sl6n\">10.1103/v24q-sl6n</a>."}},{"doi":"10.1103/8hy1-m5gg","language":[{"iso":"eng"}],"article_number":"L042068","intvolume":"         7","publication_status":"published","date_updated":"2026-01-09T08:03:38Z","publication_identifier":{"issn":["2643-1564"]},"author":[{"first_name":"Luca","last_name":"Bianchi","full_name":"Bianchi, Luca"},{"last_name":"Marconi","first_name":"Carlo","full_name":"Marconi, Carlo"},{"last_name":"Ares","first_name":"Laura","full_name":"Ares, Laura"},{"full_name":"Bacco, Davide","first_name":"Davide","last_name":"Bacco"},{"id":"75127","first_name":"Jan","orcid":"0000-0002-5844-3205","last_name":"Sperling","full_name":"Sperling, Jan"}],"year":"2025","title":"Unified boson sampling","department":[{"_id":"623"},{"_id":"15"},{"_id":"170"},{"_id":"706"},{"_id":"429"}],"type":"journal_article","date_created":"2026-01-09T08:02:57Z","abstract":[{"lang":"eng","text":"<jats:p>Boson sampling is a key candidate for demonstrating quantum advantage and has already yielded significant advances in quantum simulation, machine learning, and graph theory. In this work, a unification and extension of distinct forms of boson sampling is developed. The devised protocol merges discrete-variable scattershot boson sampling with continuous-variable Gaussian boson sampling. Therefore, it is rendered possible to harness the complexity of more interesting states, such as squeezed photons, in advanced sampling protocols. A generating function formalism is developed for the joint description of multiphoton and multimode light undergoing Gaussian transformations. The resulting analytical tools enable one to explore interfaces of different photonic quantum-information-processing platforms. A numerical simulation of unified sampling is carried out, benchmarking its performance, complexity, and scalability. Entanglement is characterized to exemplify the generation of quantum correlations from the nonlinear interactions of a unified sampler.</jats:p>"}],"issue":"4","publication":"Physical Review Research","volume":7,"user_id":"75127","publisher":"American Physical Society (APS)","_id":"63534","status":"public","citation":{"ieee":"L. Bianchi, C. Marconi, L. Ares, D. Bacco, and J. Sperling, “Unified boson sampling,” <i>Physical Review Research</i>, vol. 7, no. 4, Art. no. L042068, 2025, doi: <a href=\"https://doi.org/10.1103/8hy1-m5gg\">10.1103/8hy1-m5gg</a>.","apa":"Bianchi, L., Marconi, C., Ares, L., Bacco, D., &#38; Sperling, J. (2025). Unified boson sampling. <i>Physical Review Research</i>, <i>7</i>(4), Article L042068. <a href=\"https://doi.org/10.1103/8hy1-m5gg\">https://doi.org/10.1103/8hy1-m5gg</a>","chicago":"Bianchi, Luca, Carlo Marconi, Laura Ares, Davide Bacco, and Jan Sperling. “Unified Boson Sampling.” <i>Physical Review Research</i> 7, no. 4 (2025). <a href=\"https://doi.org/10.1103/8hy1-m5gg\">https://doi.org/10.1103/8hy1-m5gg</a>.","short":"L. Bianchi, C. Marconi, L. Ares, D. Bacco, J. Sperling, Physical Review Research 7 (2025).","mla":"Bianchi, Luca, et al. “Unified Boson Sampling.” <i>Physical Review Research</i>, vol. 7, no. 4, L042068, American Physical Society (APS), 2025, doi:<a href=\"https://doi.org/10.1103/8hy1-m5gg\">10.1103/8hy1-m5gg</a>.","bibtex":"@article{Bianchi_Marconi_Ares_Bacco_Sperling_2025, title={Unified boson sampling}, volume={7}, DOI={<a href=\"https://doi.org/10.1103/8hy1-m5gg\">10.1103/8hy1-m5gg</a>}, number={4L042068}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Bianchi, Luca and Marconi, Carlo and Ares, Laura and Bacco, Davide and Sperling, Jan}, year={2025} }","ama":"Bianchi L, Marconi C, Ares L, Bacco D, Sperling J. Unified boson sampling. <i>Physical Review Research</i>. 2025;7(4). doi:<a href=\"https://doi.org/10.1103/8hy1-m5gg\">10.1103/8hy1-m5gg</a>"}},{"project":[{"name":"TRR 142 - C09: TRR 142 - Ideale Erzeugung von Photonenpaaren für Verschränkungsaustausch bei Telekom Wellenlängen (C09*)","grant_number":"231447078","_id":"173"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"citation":{"bibtex":"@article{Heinisch_Köcher_Bauch_Schumacher_2024, title={Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons and entangled photon pairs}, volume={6}, DOI={<a href=\"https://doi.org/10.1103/PhysRevResearch.6.L012017\">10.1103/PhysRevResearch.6.L012017</a>}, number={1L012017}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Heinisch, Nils and Köcher, Nikolas and Bauch, David and Schumacher, Stefan}, year={2024} }","ama":"Heinisch N, Köcher N, Bauch D, Schumacher S. Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons and entangled photon pairs. <i>Physical Review Research</i>. 2024;6(1). doi:<a href=\"https://doi.org/10.1103/PhysRevResearch.6.L012017\">10.1103/PhysRevResearch.6.L012017</a>","mla":"Heinisch, Nils, et al. “Swing-up Dynamics in Quantum Emitter Cavity Systems: Near Ideal Single Photons and Entangled Photon Pairs.” <i>Physical Review Research</i>, vol. 6, no. 1, L012017, American Physical Society (APS), 2024, doi:<a href=\"https://doi.org/10.1103/PhysRevResearch.6.L012017\">10.1103/PhysRevResearch.6.L012017</a>.","chicago":"Heinisch, Nils, Nikolas Köcher, David Bauch, and Stefan Schumacher. “Swing-up Dynamics in Quantum Emitter Cavity Systems: Near Ideal Single Photons and Entangled Photon Pairs.” <i>Physical Review Research</i> 6, no. 1 (2024). <a href=\"https://doi.org/10.1103/PhysRevResearch.6.L012017\">https://doi.org/10.1103/PhysRevResearch.6.L012017</a>.","short":"N. Heinisch, N. Köcher, D. Bauch, S. Schumacher, Physical Review Research 6 (2024).","ieee":"N. Heinisch, N. Köcher, D. Bauch, and S. Schumacher, “Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons and entangled photon pairs,” <i>Physical Review Research</i>, vol. 6, no. 1, Art. no. L012017, 2024, doi: <a href=\"https://doi.org/10.1103/PhysRevResearch.6.L012017\">10.1103/PhysRevResearch.6.L012017</a>.","apa":"Heinisch, N., Köcher, N., Bauch, D., &#38; Schumacher, S. (2024). Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons and entangled photon pairs. <i>Physical Review Research</i>, <i>6</i>(1), Article L012017. <a href=\"https://doi.org/10.1103/PhysRevResearch.6.L012017\">https://doi.org/10.1103/PhysRevResearch.6.L012017</a>"},"status":"public","user_id":"90283","volume":6,"_id":"50829","publisher":"American Physical Society (APS)","publication":"Physical Review Research","issue":"1","type":"journal_article","department":[{"_id":"230"},{"_id":"623"},{"_id":"15"},{"_id":"170"},{"_id":"297"}],"date_created":"2024-01-24T15:17:37Z","publication_status":"published","date_updated":"2024-01-24T16:07:57Z","intvolume":"         6","year":"2024","title":"Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons and entangled photon pairs","publication_identifier":{"issn":["2643-1564"]},"author":[{"last_name":"Heinisch","first_name":"Nils","full_name":"Heinisch, Nils","id":"90283"},{"id":"79191","full_name":"Köcher, Nikolas","last_name":"Köcher","first_name":"Nikolas"},{"id":"44172","full_name":"Bauch, David","first_name":"David","last_name":"Bauch"},{"id":"27271","full_name":"Schumacher, Stefan","last_name":"Schumacher","orcid":"0000-0003-4042-4951","first_name":"Stefan"}],"doi":"10.1103/PhysRevResearch.6.L012017","article_number":"L012017","language":[{"iso":"eng"}]},{"publication":"Physical Review Research","issue":"3","abstract":[{"text":"<jats:p>We report on a photonic simulator of the critical state forming at the quantum phase transition between topologically distinct Anderson insulator phases. We observe a time-staggered profile in the circular photon polarization, which originates from the interplay of a chiral and sublattice symmetry, and has recently been suggested as a signature for topological Anderson criticality within the setup. We discuss the role of statistical detuning from criticality and show that the controlled breaking of phase coherence removes the signal, revealing its origin in quantum coherence.</jats:p>\r\n          <jats:sec>\r\n            <jats:title/>\r\n            <jats:supplementary-material>\r\n              <jats:permissions>\r\n                <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>\r\n                <jats:copyright-year>2024</jats:copyright-year>\r\n              </jats:permissions>\r\n            </jats:supplementary-material>\r\n          </jats:sec>","lang":"eng"}],"date_created":"2024-08-22T10:47:06Z","department":[{"_id":"623"}],"type":"journal_article","author":[{"id":"48188","first_name":"Sonja","last_name":"Barkhofen","full_name":"Barkhofen, Sonja"},{"first_name":"Syamsundar","last_name":"De","full_name":"De, Syamsundar"},{"id":"75127","full_name":"Sperling, Jan","last_name":"Sperling","first_name":"Jan","orcid":"0000-0002-5844-3205"},{"full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine","id":"26263"},{"full_name":"Altland, Alexander","first_name":"Alexander","last_name":"Altland"},{"first_name":"Dmitry","last_name":"Bagrets","full_name":"Bagrets, Dmitry"},{"full_name":"Kim, Kun Woo","last_name":"Kim","first_name":"Kun Woo"},{"full_name":"Micklitz, Tobias","first_name":"Tobias","last_name":"Micklitz"}],"publication_identifier":{"issn":["2643-1564"]},"year":"2024","title":"Experimental observation of topological quantum criticality","intvolume":"         6","date_updated":"2024-08-22T10:47:57Z","publication_status":"published","language":[{"iso":"eng"}],"article_number":"033194","doi":"10.1103/physrevresearch.6.033194","citation":{"apa":"Barkhofen, S., De, S., Sperling, J., Silberhorn, C., Altland, A., Bagrets, D., Kim, K. W., &#38; Micklitz, T. (2024). Experimental observation of topological quantum criticality. <i>Physical Review Research</i>, <i>6</i>(3), Article 033194. <a href=\"https://doi.org/10.1103/physrevresearch.6.033194\">https://doi.org/10.1103/physrevresearch.6.033194</a>","ieee":"S. Barkhofen <i>et al.</i>, “Experimental observation of topological quantum criticality,” <i>Physical Review Research</i>, vol. 6, no. 3, Art. no. 033194, 2024, doi: <a href=\"https://doi.org/10.1103/physrevresearch.6.033194\">10.1103/physrevresearch.6.033194</a>.","chicago":"Barkhofen, Sonja, Syamsundar De, Jan Sperling, Christine Silberhorn, Alexander Altland, Dmitry Bagrets, Kun Woo Kim, and Tobias Micklitz. “Experimental Observation of Topological Quantum Criticality.” <i>Physical Review Research</i> 6, no. 3 (2024). <a href=\"https://doi.org/10.1103/physrevresearch.6.033194\">https://doi.org/10.1103/physrevresearch.6.033194</a>.","short":"S. Barkhofen, S. De, J. Sperling, C. Silberhorn, A. Altland, D. Bagrets, K.W. Kim, T. Micklitz, Physical Review Research 6 (2024).","mla":"Barkhofen, Sonja, et al. “Experimental Observation of Topological Quantum Criticality.” <i>Physical Review Research</i>, vol. 6, no. 3, 033194, American Physical Society (APS), 2024, doi:<a href=\"https://doi.org/10.1103/physrevresearch.6.033194\">10.1103/physrevresearch.6.033194</a>.","ama":"Barkhofen S, De S, Sperling J, et al. Experimental observation of topological quantum criticality. <i>Physical Review Research</i>. 2024;6(3). doi:<a href=\"https://doi.org/10.1103/physrevresearch.6.033194\">10.1103/physrevresearch.6.033194</a>","bibtex":"@article{Barkhofen_De_Sperling_Silberhorn_Altland_Bagrets_Kim_Micklitz_2024, title={Experimental observation of topological quantum criticality}, volume={6}, DOI={<a href=\"https://doi.org/10.1103/physrevresearch.6.033194\">10.1103/physrevresearch.6.033194</a>}, number={3033194}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Barkhofen, Sonja and De, Syamsundar and Sperling, Jan and Silberhorn, Christine and Altland, Alexander and Bagrets, Dmitry and Kim, Kun Woo and Micklitz, Tobias}, year={2024} }"},"status":"public","_id":"55737","publisher":"American Physical Society (APS)","volume":6,"user_id":"48188"},{"status":"public","user_id":"16199","volume":6,"publisher":"American Physical Society (APS)","_id":"61253","project":[{"_id":"52","name":"Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"},{"_id":"56","name":"TRR 142 - Project Area C"},{"_id":"173","name":"TRR 142; TP C09: Ideale Erzeugung von Photonenpaaren für Verschränkungsaustausch bei Telekom Wellenlängen"}],"citation":{"ama":"Heinisch N, Köcher N, Bauch D, Schumacher S. Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons and entangled photon pairs. <i>Physical Review Research</i>. 2024;6(1). doi:<a href=\"https://doi.org/10.1103/physrevresearch.6.l012017\">10.1103/physrevresearch.6.l012017</a>","bibtex":"@article{Heinisch_Köcher_Bauch_Schumacher_2024, title={Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons and entangled photon pairs}, volume={6}, DOI={<a href=\"https://doi.org/10.1103/physrevresearch.6.l012017\">10.1103/physrevresearch.6.l012017</a>}, number={1L012017}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Heinisch, Nils and Köcher, Nikolas and Bauch, David and Schumacher, Stefan}, year={2024} }","mla":"Heinisch, Nils, et al. “Swing-up Dynamics in Quantum Emitter Cavity Systems: Near Ideal Single Photons and Entangled Photon Pairs.” <i>Physical Review Research</i>, vol. 6, no. 1, L012017, American Physical Society (APS), 2024, doi:<a href=\"https://doi.org/10.1103/physrevresearch.6.l012017\">10.1103/physrevresearch.6.l012017</a>.","chicago":"Heinisch, Nils, Nikolas Köcher, David Bauch, and Stefan Schumacher. “Swing-up Dynamics in Quantum Emitter Cavity Systems: Near Ideal Single Photons and Entangled Photon Pairs.” <i>Physical Review Research</i> 6, no. 1 (2024). <a href=\"https://doi.org/10.1103/physrevresearch.6.l012017\">https://doi.org/10.1103/physrevresearch.6.l012017</a>.","short":"N. Heinisch, N. Köcher, D. Bauch, S. Schumacher, Physical Review Research 6 (2024).","apa":"Heinisch, N., Köcher, N., Bauch, D., &#38; Schumacher, S. (2024). Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons and entangled photon pairs. <i>Physical Review Research</i>, <i>6</i>(1), Article L012017. <a href=\"https://doi.org/10.1103/physrevresearch.6.l012017\">https://doi.org/10.1103/physrevresearch.6.l012017</a>","ieee":"N. Heinisch, N. Köcher, D. Bauch, and S. Schumacher, “Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons and entangled photon pairs,” <i>Physical Review Research</i>, vol. 6, no. 1, Art. no. L012017, 2024, doi: <a href=\"https://doi.org/10.1103/physrevresearch.6.l012017\">10.1103/physrevresearch.6.l012017</a>."},"publication_status":"published","date_updated":"2025-09-12T11:18:05Z","intvolume":"         6","year":"2024","title":"Swing-up dynamics in quantum emitter cavity systems: Near ideal single photons and entangled photon pairs","author":[{"id":"90283","last_name":"Heinisch","orcid":"0009-0006-0984-2097","first_name":"Nils","full_name":"Heinisch, Nils"},{"id":"79191","full_name":"Köcher, Nikolas","last_name":"Köcher","first_name":"Nikolas"},{"full_name":"Bauch, David","first_name":"David","last_name":"Bauch"},{"id":"27271","full_name":"Schumacher, Stefan","orcid":"0000-0003-4042-4951","first_name":"Stefan","last_name":"Schumacher"}],"publication_identifier":{"issn":["2643-1564"]},"doi":"10.1103/physrevresearch.6.l012017","article_number":"L012017","language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"<jats:p>In the SUPER scheme (Swing-UP of the quantum EmitteR population), excitation of a quantum emitter is achieved with two off-resonant, red-detuned laser pulses. This allows the generation of high-quality single photons without the need of complex laser stray light suppression or careful spectral filtering. In the present work, we extend this promising method to quantum emitters, specifically semiconductor quantum dots, inside a resonant optical cavity. A significant advantage of the SUPER scheme is identified in that it eliminates re-excitation of the quantum emitter by suppressing photon emission during the excitation cycle. This, in turn, leads to almost ideal single-photon purity, overcoming a major factor typically limiting the quality of photons generated with quantum emitters in high-quality cavities. We further find that for cavity-mediated biexciton emission of degenerate photon pairs, the SUPER scheme leads to near-perfect biexciton initialization with very high values of polarization entanglement of emitted photon pairs.</jats:p>\r\n          <jats:sec>\r\n            <jats:title/>\r\n            <jats:supplementary-material>\r\n              <jats:permissions>\r\n                <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>\r\n                <jats:copyright-year>2024</jats:copyright-year>\r\n              </jats:permissions>\r\n            </jats:supplementary-material>\r\n          </jats:sec>"}],"issue":"1","publication":"Physical Review Research","type":"journal_article","department":[{"_id":"15"},{"_id":"170"},{"_id":"297"},{"_id":"35"},{"_id":"230"},{"_id":"429"},{"_id":"27"}],"date_created":"2025-09-12T11:16:31Z"},{"date_created":"2025-09-12T11:23:33Z","type":"journal_article","department":[{"_id":"15"},{"_id":"170"},{"_id":"297"},{"_id":"705"},{"_id":"35"},{"_id":"230"},{"_id":"27"},{"_id":"429"}],"issue":"1","publication":"Physical Review Research","abstract":[{"text":"<jats:p>Exceptional points (EPs), with their intriguing spectral topology, have attracted considerable attention in a broad range of physical systems, with potential sensing applications driving much of the present research in this field. Here, we investigate spectral topology and EPs in systems with significant nonlinearity, exemplified by a nonequilibrium exciton-polariton condensate. With the possibility to control loss and gain and nonlinearity by optical means, this system allows for a comprehensive analysis of the interplay of nonlinearities (Kerr type and saturable gain) and non-Hermiticity. Not only do we find that EPs can be intentionally shifted in parameter space by the saturable gain, but we also observe intriguing rotations and intersections of Riemann surfaces and find nonlinearity-enhanced sensing capabilities. With this, our results illustrate the potential of tailoring spectral topology and related phenomena in non-Hermitian systems by nonlinearity.</jats:p>\r\n          <jats:sec>\r\n            <jats:title/>\r\n            <jats:supplementary-material>\r\n              <jats:permissions>\r\n                <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>\r\n                <jats:copyright-year>2024</jats:copyright-year>\r\n              </jats:permissions>\r\n            </jats:supplementary-material>\r\n          </jats:sec>","lang":"eng"}],"article_number":"013148","language":[{"iso":"eng"}],"doi":"10.1103/physrevresearch.6.013148","year":"2024","title":"Manipulating spectral topology and exceptional points by nonlinearity in non-Hermitian polariton systems","publication_identifier":{"issn":["2643-1564"]},"author":[{"id":"69187","first_name":"Jan","last_name":"Wingenbach","full_name":"Wingenbach, Jan"},{"first_name":"Stefan","orcid":"0000-0003-4042-4951","last_name":"Schumacher","full_name":"Schumacher, Stefan","id":"27271"},{"id":"59416","full_name":"Ma, Xuekai","last_name":"Ma","first_name":"Xuekai"}],"date_updated":"2025-09-12T11:24:59Z","publication_status":"published","intvolume":"         6","citation":{"bibtex":"@article{Wingenbach_Schumacher_Ma_2024, title={Manipulating spectral topology and exceptional points by nonlinearity in non-Hermitian polariton systems}, volume={6}, DOI={<a href=\"https://doi.org/10.1103/physrevresearch.6.013148\">10.1103/physrevresearch.6.013148</a>}, number={1013148}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Wingenbach, Jan and Schumacher, Stefan and Ma, Xuekai}, year={2024} }","ama":"Wingenbach J, Schumacher S, Ma X. Manipulating spectral topology and exceptional points by nonlinearity in non-Hermitian polariton systems. <i>Physical Review Research</i>. 2024;6(1). doi:<a href=\"https://doi.org/10.1103/physrevresearch.6.013148\">10.1103/physrevresearch.6.013148</a>","mla":"Wingenbach, Jan, et al. “Manipulating Spectral Topology and Exceptional Points by Nonlinearity in Non-Hermitian Polariton Systems.” <i>Physical Review Research</i>, vol. 6, no. 1, 013148, American Physical Society (APS), 2024, doi:<a href=\"https://doi.org/10.1103/physrevresearch.6.013148\">10.1103/physrevresearch.6.013148</a>.","short":"J. Wingenbach, S. Schumacher, X. Ma, Physical Review Research 6 (2024).","chicago":"Wingenbach, Jan, Stefan Schumacher, and Xuekai Ma. “Manipulating Spectral Topology and Exceptional Points by Nonlinearity in Non-Hermitian Polariton Systems.” <i>Physical Review Research</i> 6, no. 1 (2024). <a href=\"https://doi.org/10.1103/physrevresearch.6.013148\">https://doi.org/10.1103/physrevresearch.6.013148</a>.","ieee":"J. Wingenbach, S. Schumacher, and X. Ma, “Manipulating spectral topology and exceptional points by nonlinearity in non-Hermitian polariton systems,” <i>Physical Review Research</i>, vol. 6, no. 1, Art. no. 013148, 2024, doi: <a href=\"https://doi.org/10.1103/physrevresearch.6.013148\">10.1103/physrevresearch.6.013148</a>.","apa":"Wingenbach, J., Schumacher, S., &#38; Ma, X. (2024). Manipulating spectral topology and exceptional points by nonlinearity in non-Hermitian polariton systems. <i>Physical Review Research</i>, <i>6</i>(1), Article 013148. <a href=\"https://doi.org/10.1103/physrevresearch.6.013148\">https://doi.org/10.1103/physrevresearch.6.013148</a>"},"project":[{"name":"Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"},{"_id":"53","name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"},{"name":"TRR 142 - Project Area A","_id":"54"},{"name":"TRR 142; TP A04: Nichtlineare Quantenprozesstomographie und Photonik mit Polaritonen in Mikrokavitäten","_id":"61"}],"_id":"61257","publisher":"American Physical Society (APS)","user_id":"16199","volume":6,"status":"public"},{"status":"public","_id":"52876","publisher":"American Physical Society (APS)","volume":6,"user_id":"48188","citation":{"bibtex":"@article{Arends_Wolf_Meinecke_Barkhofen_Weich_Bartley_2024, title={Decomposing large unitaries into multimode devices of arbitrary size}, volume={6}, DOI={<a href=\"https://doi.org/10.1103/physrevresearch.6.l012043\">10.1103/physrevresearch.6.l012043</a>}, number={1L012043}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Arends, Christian and Wolf, Lasse Lennart and Meinecke, Jasmin and Barkhofen, Sonja and Weich, Tobias and Bartley, Tim}, year={2024} }","ama":"Arends C, Wolf LL, Meinecke J, Barkhofen S, Weich T, Bartley T. Decomposing large unitaries into multimode devices of arbitrary size. <i>Physical Review Research</i>. 2024;6(1). doi:<a href=\"https://doi.org/10.1103/physrevresearch.6.l012043\">10.1103/physrevresearch.6.l012043</a>","mla":"Arends, Christian, et al. “Decomposing Large Unitaries into Multimode Devices of Arbitrary Size.” <i>Physical Review Research</i>, vol. 6, no. 1, L012043, American Physical Society (APS), 2024, doi:<a href=\"https://doi.org/10.1103/physrevresearch.6.l012043\">10.1103/physrevresearch.6.l012043</a>.","short":"C. Arends, L.L. Wolf, J. Meinecke, S. Barkhofen, T. Weich, T. Bartley, Physical Review Research 6 (2024).","chicago":"Arends, Christian, Lasse Lennart Wolf, Jasmin Meinecke, Sonja Barkhofen, Tobias Weich, and Tim Bartley. “Decomposing Large Unitaries into Multimode Devices of Arbitrary Size.” <i>Physical Review Research</i> 6, no. 1 (2024). <a href=\"https://doi.org/10.1103/physrevresearch.6.l012043\">https://doi.org/10.1103/physrevresearch.6.l012043</a>.","ieee":"C. Arends, L. L. Wolf, J. Meinecke, S. Barkhofen, T. Weich, and T. Bartley, “Decomposing large unitaries into multimode devices of arbitrary size,” <i>Physical Review Research</i>, vol. 6, no. 1, Art. no. L012043, 2024, doi: <a href=\"https://doi.org/10.1103/physrevresearch.6.l012043\">10.1103/physrevresearch.6.l012043</a>.","apa":"Arends, C., Wolf, L. L., Meinecke, J., Barkhofen, S., Weich, T., &#38; Bartley, T. (2024). Decomposing large unitaries into multimode devices of arbitrary size. <i>Physical Review Research</i>, <i>6</i>(1), Article L012043. <a href=\"https://doi.org/10.1103/physrevresearch.6.l012043\">https://doi.org/10.1103/physrevresearch.6.l012043</a>"},"author":[{"id":"43994","last_name":"Arends","first_name":"Christian","full_name":"Arends, Christian"},{"id":"45027","orcid":"0000-0001-8893-2045","first_name":"Lasse Lennart","last_name":"Wolf","full_name":"Wolf, Lasse Lennart"},{"last_name":"Meinecke","first_name":"Jasmin","full_name":"Meinecke, Jasmin"},{"full_name":"Barkhofen, Sonja","first_name":"Sonja","last_name":"Barkhofen","id":"48188"},{"id":"49178","full_name":"Weich, Tobias","first_name":"Tobias","last_name":"Weich","orcid":"0000-0002-9648-6919"},{"last_name":"Bartley","first_name":"Tim","full_name":"Bartley, Tim","id":"49683"}],"publication_identifier":{"issn":["2643-1564"]},"year":"2024","title":"Decomposing large unitaries into multimode devices of arbitrary size","intvolume":"         6","publication_status":"published","date_updated":"2025-12-04T13:38:49Z","language":[{"iso":"eng"}],"article_number":"L012043","doi":"10.1103/physrevresearch.6.l012043","publication":"Physical Review Research","issue":"1","date_created":"2024-03-26T08:52:05Z","department":[{"_id":"623"},{"_id":"15"}],"type":"journal_article","keyword":["General Physics and Astronomy"]},{"doi":"10.1103/physrevresearch.6.l022040","language":[{"iso":"eng"}],"article_number":"L022040","intvolume":"         6","publication_status":"published","date_updated":"2025-12-18T16:14:39Z","publication_identifier":{"issn":["2643-1564"]},"author":[{"first_name":"Syamsundar","last_name":"De","full_name":"De, Syamsundar"},{"full_name":"Ansari, Vahid","last_name":"Ansari","first_name":"Vahid"},{"full_name":"Sperling, Jan","last_name":"Sperling","first_name":"Jan","orcid":"0000-0002-5844-3205","id":"75127"},{"id":"48188","last_name":"Barkhofen","first_name":"Sonja","full_name":"Barkhofen, Sonja"},{"first_name":"Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 ","full_name":"Brecht, Benjamin","id":"27150"},{"id":"26263","full_name":"Silberhorn, Christine","first_name":"Christine","last_name":"Silberhorn"}],"year":"2024","title":"Realization of high-fidelity unitary operations on up to 64 frequency bins","department":[{"_id":"623"},{"_id":"288"},{"_id":"15"}],"type":"journal_article","date_created":"2024-05-14T12:40:48Z","abstract":[{"text":"<jats:p>The ability to apply user-chosen large-scale unitary operations with high fidelity to a quantum state is key to realizing future photonic quantum technologies. Here, we realize the implementation of programmable unitary operations on up to 64 frequency-bin modes. To benchmark the performance of our system, we probe different quantum walk unitary operations, in particular, Grover walks on four-dimensional hypercubes with similarities exceeding 95% and quantum walks with 400 steps on circles and finite lines with similarities of 98%. Our results open a path toward implementing high-quality unitary operations, which can form the basis for applications in complex tasks, such as Gaussian boson sampling.</jats:p>\r\n          <jats:sec>\r\n            <jats:title/>\r\n            <jats:supplementary-material>\r\n              <jats:permissions>\r\n                <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>\r\n                <jats:copyright-year>2024</jats:copyright-year>\r\n              </jats:permissions>\r\n            </jats:supplementary-material>\r\n          </jats:sec>","lang":"eng"}],"publication":"Physical Review Research","issue":"2","volume":6,"user_id":"27150","_id":"54288","publisher":"American Physical Society (APS)","status":"public","project":[{"name":"QuPoPCoRN: QUPOPCORN: Quantum Particles on Programmable Complex Reconfigurable Networks","_id":"216"}],"citation":{"mla":"De, Syamsundar, et al. “Realization of High-Fidelity Unitary Operations on up to 64 Frequency Bins.” <i>Physical Review Research</i>, vol. 6, no. 2, L022040, American Physical Society (APS), 2024, doi:<a href=\"https://doi.org/10.1103/physrevresearch.6.l022040\">10.1103/physrevresearch.6.l022040</a>.","bibtex":"@article{De_Ansari_Sperling_Barkhofen_Brecht_Silberhorn_2024, title={Realization of high-fidelity unitary operations on up to 64 frequency bins}, volume={6}, DOI={<a href=\"https://doi.org/10.1103/physrevresearch.6.l022040\">10.1103/physrevresearch.6.l022040</a>}, number={2L022040}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={De, Syamsundar and Ansari, Vahid and Sperling, Jan and Barkhofen, Sonja and Brecht, Benjamin and Silberhorn, Christine}, year={2024} }","ama":"De S, Ansari V, Sperling J, Barkhofen S, Brecht B, Silberhorn C. Realization of high-fidelity unitary operations on up to 64 frequency bins. <i>Physical Review Research</i>. 2024;6(2). doi:<a href=\"https://doi.org/10.1103/physrevresearch.6.l022040\">10.1103/physrevresearch.6.l022040</a>","ieee":"S. De, V. Ansari, J. Sperling, S. Barkhofen, B. Brecht, and C. Silberhorn, “Realization of high-fidelity unitary operations on up to 64 frequency bins,” <i>Physical Review Research</i>, vol. 6, no. 2, Art. no. L022040, 2024, doi: <a href=\"https://doi.org/10.1103/physrevresearch.6.l022040\">10.1103/physrevresearch.6.l022040</a>.","apa":"De, S., Ansari, V., Sperling, J., Barkhofen, S., Brecht, B., &#38; Silberhorn, C. (2024). Realization of high-fidelity unitary operations on up to 64 frequency bins. <i>Physical Review Research</i>, <i>6</i>(2), Article L022040. <a href=\"https://doi.org/10.1103/physrevresearch.6.l022040\">https://doi.org/10.1103/physrevresearch.6.l022040</a>","chicago":"De, Syamsundar, Vahid Ansari, Jan Sperling, Sonja Barkhofen, Benjamin Brecht, and Christine Silberhorn. “Realization of High-Fidelity Unitary Operations on up to 64 Frequency Bins.” <i>Physical Review Research</i> 6, no. 2 (2024). <a href=\"https://doi.org/10.1103/physrevresearch.6.l022040\">https://doi.org/10.1103/physrevresearch.6.l022040</a>.","short":"S. De, V. Ansari, J. Sperling, S. Barkhofen, B. Brecht, C. Silberhorn, Physical Review Research 6 (2024)."}},{"citation":{"bibtex":"@article{Verhoff_Pionteck_Rüsing_Fritze_Eng_Sanna_2024, title={Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls}, volume={6}, DOI={<a href=\"https://doi.org/10.1103/physrevresearch.6.l042015\">10.1103/physrevresearch.6.l042015</a>}, number={4L042015}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Verhoff, Leonard M. and Pionteck, Mike N. and Rüsing, Michael and Fritze, Holger and Eng, Lukas M. and Sanna, Simone}, year={2024} }","ama":"Verhoff LM, Pionteck MN, Rüsing M, Fritze H, Eng LM, Sanna S. Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls. <i>Physical Review Research</i>. 2024;6(4). doi:<a href=\"https://doi.org/10.1103/physrevresearch.6.l042015\">10.1103/physrevresearch.6.l042015</a>","mla":"Verhoff, Leonard M., et al. “Two-Dimensional Electronic Conductivity in Insulating Ferroelectrics: Peculiar Properties of Domain Walls.” <i>Physical Review Research</i>, vol. 6, no. 4, L042015, American Physical Society (APS), 2024, doi:<a href=\"https://doi.org/10.1103/physrevresearch.6.l042015\">10.1103/physrevresearch.6.l042015</a>.","chicago":"Verhoff, Leonard M., Mike N. Pionteck, Michael Rüsing, Holger Fritze, Lukas M. Eng, and Simone Sanna. “Two-Dimensional Electronic Conductivity in Insulating Ferroelectrics: Peculiar Properties of Domain Walls.” <i>Physical Review Research</i> 6, no. 4 (2024). <a href=\"https://doi.org/10.1103/physrevresearch.6.l042015\">https://doi.org/10.1103/physrevresearch.6.l042015</a>.","short":"L.M. Verhoff, M.N. Pionteck, M. Rüsing, H. Fritze, L.M. Eng, S. Sanna, Physical Review Research 6 (2024).","ieee":"L. M. Verhoff, M. N. Pionteck, M. Rüsing, H. Fritze, L. M. Eng, and S. Sanna, “Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls,” <i>Physical Review Research</i>, vol. 6, no. 4, Art. no. L042015, 2024, doi: <a href=\"https://doi.org/10.1103/physrevresearch.6.l042015\">10.1103/physrevresearch.6.l042015</a>.","apa":"Verhoff, L. M., Pionteck, M. N., Rüsing, M., Fritze, H., Eng, L. M., &#38; Sanna, S. (2024). Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls. <i>Physical Review Research</i>, <i>6</i>(4), Article L042015. <a href=\"https://doi.org/10.1103/physrevresearch.6.l042015\">https://doi.org/10.1103/physrevresearch.6.l042015</a>"},"publisher":"American Physical Society (APS)","_id":"59272","volume":6,"user_id":"22501","status":"public","date_created":"2025-04-02T16:08:55Z","department":[{"_id":"623"},{"_id":"288"},{"_id":"15"}],"type":"journal_article","publication":"Physical Review Research","issue":"4","abstract":[{"text":"Ferroelectrics such as LiNbO3 (LN) are wide-band-gap insulators that may show a high local electric conductivity at the domain walls (DWs). The latter are interfaces separating regions of noncollinear polarization, which can be manipulated to build integrated nanoelectronic elements. In the present work, we model different DW types in LN from first principles. Our models reveal the DW morphology and shed light on their electronic properties: A strong band bending is predicted for charged DWs, leading to local metallicity. Defect trapping at the DW may further enhance the electric conductivity.","lang":"eng"}],"language":[{"iso":"eng"}],"main_file_link":[{"url":"https://jlupub.ub.uni-giessen.de/server/api/core/bitstreams/fb2b09e6-c0f8-4209-99a1-79fc81d9b1f9/content"}],"article_number":"L042015","doi":"10.1103/physrevresearch.6.l042015","author":[{"full_name":"Verhoff, Leonard M.","first_name":"Leonard M.","last_name":"Verhoff"},{"full_name":"Pionteck, Mike N.","first_name":"Mike N.","last_name":"Pionteck"},{"id":"22501","full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","first_name":"Michael","last_name":"Rüsing"},{"full_name":"Fritze, Holger","first_name":"Holger","last_name":"Fritze"},{"first_name":"Lukas M.","last_name":"Eng","full_name":"Eng, Lukas M."},{"first_name":"Simone","last_name":"Sanna","full_name":"Sanna, Simone"}],"publication_identifier":{"issn":["2643-1564"]},"year":"2024","title":"Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls","intvolume":"         6","date_updated":"2025-04-02T16:10:59Z","publication_status":"published"},{"status":"public","user_id":"60286","volume":5,"publisher":"American Physical Society (APS)","_id":"49117","citation":{"short":"D. Scharwald, T. Meier, P.R. Sharapova, Physical Review Research 5 (2023).","chicago":"Scharwald, D., T. Meier, and P. R. Sharapova. “Phase Sensitivity of Spatially Broadband High-Gain &#60;mml:Math Xmlns:Mml=\"http://Www.W3.Org/1998/Math/MathML\"&#62;&#60;mml:Mrow&#62;&#60;mml:Mi&#62;SU&#60;/Mml:Mi&#62;&#60;mml:Mo&#62;(&#60;/Mml:Mo&#62;&#60;mml:Mn&#62;1&#60;/Mml:Mn&#62;&#60;mml:Mo&#62;,&#60;/Mml:Mo&#62;&#60;mml:Mn&#62;1&#60;/Mml:Mn&#62;&#60;mml:Mo&#62;)&#60;/Mml:Mo&#62;&#60;/Mml:Mrow&#62;&#60;/Mml:Math&#62; Interferometers.” <i>Physical Review Research</i> 5, no. 4 (2023). <a href=\"https://doi.org/10.1103/physrevresearch.5.043158\">https://doi.org/10.1103/physrevresearch.5.043158</a>.","apa":"Scharwald, D., Meier, T., &#38; Sharapova, P. R. (2023). Phase sensitivity of spatially broadband high-gain &#60;mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"&#62;&#60;mml:mrow&#62;&#60;mml:mi&#62;SU&#60;/mml:mi&#62;&#60;mml:mo&#62;(&#60;/mml:mo&#62;&#60;mml:mn&#62;1&#60;/mml:mn&#62;&#60;mml:mo&#62;,&#60;/mml:mo&#62;&#60;mml:mn&#62;1&#60;/mml:mn&#62;&#60;mml:mo&#62;)&#60;/mml:mo&#62;&#60;/mml:mrow&#62;&#60;/mml:math&#62; interferometers. <i>Physical Review Research</i>, <i>5</i>(4), Article 043158. <a href=\"https://doi.org/10.1103/physrevresearch.5.043158\">https://doi.org/10.1103/physrevresearch.5.043158</a>","ieee":"D. Scharwald, T. Meier, and P. R. Sharapova, “Phase sensitivity of spatially broadband high-gain &#60;mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"&#62;&#60;mml:mrow&#62;&#60;mml:mi&#62;SU&#60;/mml:mi&#62;&#60;mml:mo&#62;(&#60;/mml:mo&#62;&#60;mml:mn&#62;1&#60;/mml:mn&#62;&#60;mml:mo&#62;,&#60;/mml:mo&#62;&#60;mml:mn&#62;1&#60;/mml:mn&#62;&#60;mml:mo&#62;)&#60;/mml:mo&#62;&#60;/mml:mrow&#62;&#60;/mml:math&#62; interferometers,” <i>Physical Review Research</i>, vol. 5, no. 4, Art. no. 043158, 2023, doi: <a href=\"https://doi.org/10.1103/physrevresearch.5.043158\">10.1103/physrevresearch.5.043158</a>.","ama":"Scharwald D, Meier T, Sharapova PR. Phase sensitivity of spatially broadband high-gain &#60;mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"&#62;&#60;mml:mrow&#62;&#60;mml:mi&#62;SU&#60;/mml:mi&#62;&#60;mml:mo&#62;(&#60;/mml:mo&#62;&#60;mml:mn&#62;1&#60;/mml:mn&#62;&#60;mml:mo&#62;,&#60;/mml:mo&#62;&#60;mml:mn&#62;1&#60;/mml:mn&#62;&#60;mml:mo&#62;)&#60;/mml:mo&#62;&#60;/mml:mrow&#62;&#60;/mml:math&#62; interferometers. <i>Physical Review Research</i>. 2023;5(4). doi:<a href=\"https://doi.org/10.1103/physrevresearch.5.043158\">10.1103/physrevresearch.5.043158</a>","bibtex":"@article{Scharwald_Meier_Sharapova_2023, title={Phase sensitivity of spatially broadband high-gain &#60;mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"&#62;&#60;mml:mrow&#62;&#60;mml:mi&#62;SU&#60;/mml:mi&#62;&#60;mml:mo&#62;(&#60;/mml:mo&#62;&#60;mml:mn&#62;1&#60;/mml:mn&#62;&#60;mml:mo&#62;,&#60;/mml:mo&#62;&#60;mml:mn&#62;1&#60;/mml:mn&#62;&#60;mml:mo&#62;)&#60;/mml:mo&#62;&#60;/mml:mrow&#62;&#60;/mml:math&#62; interferometers}, volume={5}, DOI={<a href=\"https://doi.org/10.1103/physrevresearch.5.043158\">10.1103/physrevresearch.5.043158</a>}, number={4043158}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Scharwald, D. and Meier, T. and Sharapova, P. R.}, year={2023} }","mla":"Scharwald, D., et al. “Phase Sensitivity of Spatially Broadband High-Gain &#60;mml:Math Xmlns:Mml=\"http://Www.W3.Org/1998/Math/MathML\"&#62;&#60;mml:Mrow&#62;&#60;mml:Mi&#62;SU&#60;/Mml:Mi&#62;&#60;mml:Mo&#62;(&#60;/Mml:Mo&#62;&#60;mml:Mn&#62;1&#60;/Mml:Mn&#62;&#60;mml:Mo&#62;,&#60;/Mml:Mo&#62;&#60;mml:Mn&#62;1&#60;/Mml:Mn&#62;&#60;mml:Mo&#62;)&#60;/Mml:Mo&#62;&#60;/Mml:Mrow&#62;&#60;/Mml:Math&#62; Interferometers.” <i>Physical Review Research</i>, vol. 5, no. 4, 043158, American Physical Society (APS), 2023, doi:<a href=\"https://doi.org/10.1103/physrevresearch.5.043158\">10.1103/physrevresearch.5.043158</a>."},"date_updated":"2023-11-22T09:19:02Z","publication_status":"published","intvolume":"         5","title":"Phase sensitivity of spatially broadband high-gain <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"><mml:mrow><mml:mi>SU</mml:mi><mml:mo>(</mml:mo><mml:mn>1</mml:mn><mml:mo>,</mml:mo><mml:mn>1</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math> interferometers","year":"2023","author":[{"first_name":"D.","last_name":"Scharwald","full_name":"Scharwald, D."},{"full_name":"Meier, T.","first_name":"T.","last_name":"Meier"},{"last_name":"Sharapova","first_name":"P. R.","full_name":"Sharapova, P. R."}],"publication_identifier":{"issn":["2643-1564"]},"doi":"10.1103/physrevresearch.5.043158","article_number":"043158","language":[{"iso":"eng"}],"publication":"Physical Review Research","issue":"4","keyword":["General Physics and Astronomy"],"type":"journal_article","department":[{"_id":"15"},{"_id":"170"},{"_id":"230"},{"_id":"569"},{"_id":"429"}],"date_created":"2023-11-22T09:18:02Z"},{"department":[{"_id":"15"},{"_id":"170"},{"_id":"293"},{"_id":"230"}],"type":"journal_article","keyword":["General Physics and Astronomy"],"date_created":"2024-02-27T13:57:01Z","issue":"4","publication":"Physical Review Research","doi":"10.1103/physrevresearch.5.043152","language":[{"iso":"eng"}],"article_number":"043152","intvolume":"         5","publication_status":"published","date_updated":"2024-02-28T12:53:40Z","publication_identifier":{"issn":["2643-1564"]},"author":[{"full_name":"Ali, Usman","last_name":"Ali","first_name":"Usman"},{"full_name":"Holthaus, Martin","first_name":"Martin","last_name":"Holthaus"},{"last_name":"Meier","first_name":"Torsten","orcid":"0000-0001-8864-2072","full_name":"Meier, Torsten","id":"344"}],"year":"2023","title":"Chirped Bloch-harmonic oscillations in a parametrically forced optical lattice","citation":{"bibtex":"@article{Ali_Holthaus_Meier_2023, title={Chirped Bloch-harmonic oscillations in a parametrically forced optical lattice}, volume={5}, DOI={<a href=\"https://doi.org/10.1103/physrevresearch.5.043152\">10.1103/physrevresearch.5.043152</a>}, number={4043152}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Ali, Usman and Holthaus, Martin and Meier, Torsten}, year={2023} }","ama":"Ali U, Holthaus M, Meier T. Chirped Bloch-harmonic oscillations in a parametrically forced optical lattice. <i>Physical Review Research</i>. 2023;5(4). doi:<a href=\"https://doi.org/10.1103/physrevresearch.5.043152\">10.1103/physrevresearch.5.043152</a>","mla":"Ali, Usman, et al. “Chirped Bloch-Harmonic Oscillations in a Parametrically Forced Optical Lattice.” <i>Physical Review Research</i>, vol. 5, no. 4, 043152, American Physical Society (APS), 2023, doi:<a href=\"https://doi.org/10.1103/physrevresearch.5.043152\">10.1103/physrevresearch.5.043152</a>.","short":"U. Ali, M. Holthaus, T. Meier, Physical Review Research 5 (2023).","chicago":"Ali, Usman, Martin Holthaus, and Torsten Meier. “Chirped Bloch-Harmonic Oscillations in a Parametrically Forced Optical Lattice.” <i>Physical Review Research</i> 5, no. 4 (2023). <a href=\"https://doi.org/10.1103/physrevresearch.5.043152\">https://doi.org/10.1103/physrevresearch.5.043152</a>.","ieee":"U. Ali, M. Holthaus, and T. Meier, “Chirped Bloch-harmonic oscillations in a parametrically forced optical lattice,” <i>Physical Review Research</i>, vol. 5, no. 4, Art. no. 043152, 2023, doi: <a href=\"https://doi.org/10.1103/physrevresearch.5.043152\">10.1103/physrevresearch.5.043152</a>.","apa":"Ali, U., Holthaus, M., &#38; Meier, T. (2023). Chirped Bloch-harmonic oscillations in a parametrically forced optical lattice. <i>Physical Review Research</i>, <i>5</i>(4), Article 043152. <a href=\"https://doi.org/10.1103/physrevresearch.5.043152\">https://doi.org/10.1103/physrevresearch.5.043152</a>"},"volume":5,"user_id":"16199","_id":"52122","publisher":"American Physical Society (APS)","status":"public"}]