[{"publication_status":"published","date_updated":"2026-03-08T09:22:25Z","article_type":"original","intvolume":" 17","title":"Polar discontinuities, emergent conductivity, and critical twist-angle-dependent behaviour at wafer-bonded ferroelectric interfaces","year":"2026","author":[{"first_name":"Andrew","last_name":"Rogers","full_name":"Rogers, Andrew"},{"full_name":"Holsgrove, Kristina","first_name":"Kristina","last_name":"Holsgrove"},{"first_name":"Nils A.","last_name":"Schäfer","full_name":"Schäfer, Nils A."},{"last_name":"Koppitz","first_name":"Boris","full_name":"Koppitz, Boris"},{"full_name":"McCluskey, Conor J.","last_name":"McCluskey","first_name":"Conor J."},{"last_name":"Yedama","first_name":"Shivani","full_name":"Yedama, Shivani"},{"full_name":"Lynch, Ronan","first_name":"Ronan","last_name":"Lynch"},{"last_name":"Sloan","first_name":"Keelan","full_name":"Sloan, Keelan"},{"full_name":"Porter, Barry","first_name":"Barry","last_name":"Porter"},{"full_name":"Sykes, Adam","first_name":"Adam","last_name":"Sykes"},{"full_name":"Catalan Daniels, Alex","first_name":"Alex","last_name":"Catalan Daniels"},{"last_name":"Silva","first_name":"Romualdo S.","full_name":"Silva, Romualdo S."},{"full_name":"Bruno, Flavio Y.","first_name":"Flavio Y.","last_name":"Bruno"},{"first_name":"Sam D.","last_name":"Seddon","full_name":"Seddon, Sam D."},{"first_name":"Haidong","last_name":"Lu","full_name":"Lu, Haidong"},{"full_name":"Rüsing, Michael","first_name":"Michael","last_name":"Rüsing","orcid":"0000-0003-4682-4577","id":"22501"},{"last_name":"Fink","first_name":"Christa","full_name":"Fink, Christa"},{"last_name":"Fahler-Muenzer","first_name":"Philipp","full_name":"Fahler-Muenzer, Philipp"},{"first_name":"Sarah","last_name":"Fearn","full_name":"Fearn, Sarah"},{"last_name":"Heutz","first_name":"Sandrine E. M.","full_name":"Heutz, Sandrine E. M."},{"full_name":"Hadjimichael, Marios","last_name":"Hadjimichael","first_name":"Marios"},{"full_name":"Ramasse, Quentin M.","first_name":"Quentin M.","last_name":"Ramasse"},{"last_name":"Alexe","first_name":"Marin","full_name":"Alexe, Marin"},{"full_name":"Kumar, Amit","first_name":"Amit","last_name":"Kumar"},{"last_name":"McQuaid","first_name":"Raymond G. P.","full_name":"McQuaid, Raymond G. P."},{"first_name":"Alexei","last_name":"Gruverman","full_name":"Gruverman, Alexei"},{"full_name":"Sanna, Simone","first_name":"Simone","last_name":"Sanna"},{"first_name":"Lukas M.","last_name":"Eng","full_name":"Eng, Lukas M."},{"full_name":"Gregg, J. Marty","last_name":"Gregg","first_name":"J. Marty"}],"publication_identifier":{"issn":["2041-1723"]},"doi":"10.1038/s41467-026-68553-7","article_number":"1842","main_file_link":[{"open_access":"1","url":"https://www.nature.com/articles/s41467-026-68553-7"}],"language":[{"iso":"eng"}],"abstract":[{"text":"Probing novel properties, arising from twisted interfaces, has traditionally relied on the stacking of exfoliated two-dimensional materials and the spontaneous formation of van der Waals bonds. So far, investigations involving intimate covalent or ionic bonds have not been a focus. Yet, we show here that an established technique, involving thermocompressional wafer bonding, works well for creating twisted non-van der Waals interfaces. We have successfully bonded z-cut lithium niobate single crystals to create ferroelectric oxide interfaces with strong polar discontinuities and have mapped the associated emergent interfacial conductivity. In some instances, a dramatic change in microstructure occurs, involving local dipolar switching. A twist-induced collapse in the capability of the system to effec8tively screen interfacial bound charge is implied. Importantly, this only occurs around specific moiré twist angles with sparse coincident lattices and associated short-range aperiodicity. In quasicrystals, aperiodicity is known to induce pseudo-bandgaps and we suspect a similar phenomenon here.","lang":"eng"}],"issue":"1","publication":"Nature Communications","type":"journal_article","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"date_created":"2026-03-08T09:20:13Z","status":"public","user_id":"22501","volume":17,"_id":"64864","publisher":"Springer Science and Business Media LLC","quality_controlled":"1","citation":{"chicago":"Rogers, Andrew, Kristina Holsgrove, Nils A. Schäfer, Boris Koppitz, Conor J. McCluskey, Shivani Yedama, Ronan Lynch, et al. “Polar Discontinuities, Emergent Conductivity, and Critical Twist-Angle-Dependent Behaviour at Wafer-Bonded Ferroelectric Interfaces.” Nature Communications 17, no. 1 (2026). https://doi.org/10.1038/s41467-026-68553-7.","short":"A. Rogers, K. Holsgrove, N.A. Schäfer, B. Koppitz, C.J. McCluskey, S. Yedama, R. Lynch, K. Sloan, B. Porter, A. Sykes, A. Catalan Daniels, R.S. Silva, F.Y. Bruno, S.D. Seddon, H. Lu, M. Rüsing, C. Fink, P. Fahler-Muenzer, S. Fearn, S.E.M. Heutz, M. Hadjimichael, Q.M. Ramasse, M. Alexe, A. Kumar, R.G.P. McQuaid, A. Gruverman, S. Sanna, L.M. Eng, J.M. Gregg, Nature Communications 17 (2026).","ieee":"A. Rogers et al., “Polar discontinuities, emergent conductivity, and critical twist-angle-dependent behaviour at wafer-bonded ferroelectric interfaces,” Nature Communications, vol. 17, no. 1, Art. no. 1842, 2026, doi: 10.1038/s41467-026-68553-7.","apa":"Rogers, A., Holsgrove, K., Schäfer, N. A., Koppitz, B., McCluskey, C. J., Yedama, S., Lynch, R., Sloan, K., Porter, B., Sykes, A., Catalan Daniels, A., Silva, R. S., Bruno, F. Y., Seddon, S. D., Lu, H., Rüsing, M., Fink, C., Fahler-Muenzer, P., Fearn, S., … Gregg, J. M. (2026). Polar discontinuities, emergent conductivity, and critical twist-angle-dependent behaviour at wafer-bonded ferroelectric interfaces. Nature Communications, 17(1), Article 1842. https://doi.org/10.1038/s41467-026-68553-7","bibtex":"@article{Rogers_Holsgrove_Schäfer_Koppitz_McCluskey_Yedama_Lynch_Sloan_Porter_Sykes_et al._2026, title={Polar discontinuities, emergent conductivity, and critical twist-angle-dependent behaviour at wafer-bonded ferroelectric interfaces}, volume={17}, DOI={10.1038/s41467-026-68553-7}, number={11842}, journal={Nature Communications}, publisher={Springer Science and Business Media LLC}, author={Rogers, Andrew and Holsgrove, Kristina and Schäfer, Nils A. and Koppitz, Boris and McCluskey, Conor J. and Yedama, Shivani and Lynch, Ronan and Sloan, Keelan and Porter, Barry and Sykes, Adam and et al.}, year={2026} }","ama":"Rogers A, Holsgrove K, Schäfer NA, et al. Polar discontinuities, emergent conductivity, and critical twist-angle-dependent behaviour at wafer-bonded ferroelectric interfaces. Nature Communications. 2026;17(1). doi:10.1038/s41467-026-68553-7","mla":"Rogers, Andrew, et al. “Polar Discontinuities, Emergent Conductivity, and Critical Twist-Angle-Dependent Behaviour at Wafer-Bonded Ferroelectric Interfaces.” Nature Communications, vol. 17, no. 1, 1842, Springer Science and Business Media LLC, 2026, doi:10.1038/s41467-026-68553-7."},"oa":"1"},{"abstract":[{"lang":"eng","text":"\r\n The development of practical sensors for optical coherence tomography (OCT) with undetected photons requires miniaturization via integration. To be practical, these sensors must exhibit a large spectral bandwidth and a high brightness, which are linked to a high axial resolution and a sufficient signal-to-noise ratio, respectively. Here, we combine these requirements in a scheme for OCT measurements with undetected photons based on nonlinear\r\n \r\n Ti\r\n :\r\n \r\n \r\n Li\r\n Nb\r\n O\r\n \r\n 3\r\n \r\n \r\n waveguides. We investigate the performance benchmarks of the commonly used SU(1,1) scheme in comparison to an induced-coherence scheme and find that the latter is actually better suited when implementing measurements with undetected photons in integrated systems. In both schemes, we perform pump-gain optimization and OCT measurements with undetected photons with an axial resolution as low as\r\n \r\n 28\r\n \r\n μ\r\n \r\n m\r\n \r\n \r\n .\r\n "}],"issue":"3","publication":"Physical Review Applied","type":"journal_article","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"date_created":"2026-03-23T12:28:33Z","date_updated":"2026-03-25T07:59:04Z","publication_status":"published","intvolume":" 25","year":"2026","title":"Toward integrated sensors for optimized optical coherence tomography with undetected photons","publication_identifier":{"issn":["2331-7019"]},"author":[{"first_name":"Franz","last_name":"Roeder","full_name":"Roeder, Franz","id":"88149"},{"full_name":"Pollmann, René","first_name":"René","last_name":"Pollmann","id":"78890"},{"full_name":"Quiring, Viktor","first_name":"Viktor","last_name":"Quiring"},{"id":"13244","orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner","first_name":"Christof","full_name":"Eigner, Christof"},{"full_name":"Brecht, Benjamin","first_name":"Benjamin","orcid":"0000-0003-4140-0556 ","last_name":"Brecht","id":"27150"},{"full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine","id":"26263"}],"doi":"10.1103/cwsx-42c4","article_number":"034031","language":[{"iso":"eng"}],"citation":{"chicago":"Roeder, Franz, René Pollmann, Viktor Quiring, Christof Eigner, Benjamin Brecht, and Christine Silberhorn. “Toward Integrated Sensors for Optimized Optical Coherence Tomography with Undetected Photons.” Physical Review Applied 25, no. 3 (2026). https://doi.org/10.1103/cwsx-42c4.","short":"F. Roeder, R. Pollmann, V. Quiring, C. Eigner, B. Brecht, C. Silberhorn, Physical Review Applied 25 (2026).","ieee":"F. Roeder, R. Pollmann, V. Quiring, C. Eigner, B. Brecht, and C. Silberhorn, “Toward integrated sensors for optimized optical coherence tomography with undetected photons,” Physical Review Applied, vol. 25, no. 3, Art. no. 034031, 2026, doi: 10.1103/cwsx-42c4.","apa":"Roeder, F., Pollmann, R., Quiring, V., Eigner, C., Brecht, B., & Silberhorn, C. (2026). Toward integrated sensors for optimized optical coherence tomography with undetected photons. Physical Review Applied, 25(3), Article 034031. https://doi.org/10.1103/cwsx-42c4","bibtex":"@article{Roeder_Pollmann_Quiring_Eigner_Brecht_Silberhorn_2026, title={Toward integrated sensors for optimized optical coherence tomography with undetected photons}, volume={25}, DOI={10.1103/cwsx-42c4}, number={3034031}, journal={Physical Review Applied}, publisher={American Physical Society (APS)}, author={Roeder, Franz and Pollmann, René and Quiring, Viktor and Eigner, Christof and Brecht, Benjamin and Silberhorn, Christine}, year={2026} }","ama":"Roeder F, Pollmann R, Quiring V, Eigner C, Brecht B, Silberhorn C. Toward integrated sensors for optimized optical coherence tomography with undetected photons. Physical Review Applied. 2026;25(3). doi:10.1103/cwsx-42c4","mla":"Roeder, Franz, et al. “Toward Integrated Sensors for Optimized Optical Coherence Tomography with Undetected Photons.” Physical Review Applied, vol. 25, no. 3, 034031, American Physical Society (APS), 2026, doi:10.1103/cwsx-42c4."},"status":"public","user_id":"27150","volume":25,"publisher":"American Physical Society (APS)","_id":"65094"},{"type":"journal_article","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"date_created":"2026-03-23T12:30:02Z","abstract":[{"text":"\r\n Precise measurements of both the arrival time and carrier frequency of light pulses are essential for time–frequency-encoded quantum technologies. Quantum mechanics, however, imposes fundamental limits on the simultaneous determination of these quantities. In this work, we derive and experimentally verify the quantum uncertainty bounds governing joint time–frequency measurements. We show that when detection is restricted to finite time windows, the problem is naturally described by a quantum rotor, rendering the commonly used Heisenberg uncertainty relation inapplicable. We further propose an optimal detection scheme that saturates these fundamental limits. By sampling the\r\n Q\r\n -function, we demonstrate the reconstruction of the Wigner function beyond the harmonic oscillator. Using an experimental implementation based on a quantum pulse gate, we confirm that the proposed scheme approaches the ultimate quantum limit for simultaneous time–frequency measurements. These results provide a framework for joint time–frequency detection with direct implications for precision measurements and quantum information processing.\r\n ","lang":"eng"}],"publication":"Optica","issue":"3","doi":"10.1364/optica.579459","article_number":"548","language":[{"iso":"eng"}],"publication_status":"published","date_updated":"2026-03-25T07:59:23Z","intvolume":" 13","year":"2026","title":"Quantum-limited detection of the arrival time and the carrier frequency of time-dependent signals","author":[{"id":"88605","last_name":"Folge","first_name":"Patrick Fabian","full_name":"Folge, Patrick Fabian"},{"full_name":"Serino, Laura Maria","first_name":"Laura Maria","last_name":"Serino","id":"88242"},{"full_name":"Mišta, Ladislav","last_name":"Mišta","first_name":"Ladislav"},{"id":"27150","first_name":"Benjamin","orcid":"0000-0003-4140-0556 ","last_name":"Brecht","full_name":"Brecht, Benjamin"},{"last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263"},{"first_name":"Jaroslav","last_name":"Řeháček","full_name":"Řeháček, Jaroslav"},{"full_name":"Hradil, Zdeněk","first_name":"Zdeněk","last_name":"Hradil"}],"publication_identifier":{"issn":["2334-2536"]},"citation":{"mla":"Folge, Patrick Fabian, et al. “Quantum-Limited Detection of the Arrival Time and the Carrier Frequency of Time-Dependent Signals.” Optica, vol. 13, no. 3, 548, Optica Publishing Group, 2026, doi:10.1364/optica.579459.","ama":"Folge PF, Serino LM, Mišta L, et al. Quantum-limited detection of the arrival time and the carrier frequency of time-dependent signals. Optica. 2026;13(3). doi:10.1364/optica.579459","bibtex":"@article{Folge_Serino_Mišta_Brecht_Silberhorn_Řeháček_Hradil_2026, title={Quantum-limited detection of the arrival time and the carrier frequency of time-dependent signals}, volume={13}, DOI={10.1364/optica.579459}, number={3548}, journal={Optica}, publisher={Optica Publishing Group}, author={Folge, Patrick Fabian and Serino, Laura Maria and Mišta, Ladislav and Brecht, Benjamin and Silberhorn, Christine and Řeháček, Jaroslav and Hradil, Zdeněk}, year={2026} }","apa":"Folge, P. F., Serino, L. M., Mišta, L., Brecht, B., Silberhorn, C., Řeháček, J., & Hradil, Z. (2026). Quantum-limited detection of the arrival time and the carrier frequency of time-dependent signals. Optica, 13(3), Article 548. https://doi.org/10.1364/optica.579459","ieee":"P. F. Folge et al., “Quantum-limited detection of the arrival time and the carrier frequency of time-dependent signals,” Optica, vol. 13, no. 3, Art. no. 548, 2026, doi: 10.1364/optica.579459.","chicago":"Folge, Patrick Fabian, Laura Maria Serino, Ladislav Mišta, Benjamin Brecht, Christine Silberhorn, Jaroslav Řeháček, and Zdeněk Hradil. “Quantum-Limited Detection of the Arrival Time and the Carrier Frequency of Time-Dependent Signals.” Optica 13, no. 3 (2026). https://doi.org/10.1364/optica.579459.","short":"P.F. Folge, L.M. Serino, L. Mišta, B. Brecht, C. Silberhorn, J. Řeháček, Z. Hradil, Optica 13 (2026)."},"user_id":"27150","volume":13,"publisher":"Optica Publishing Group","_id":"65096","status":"public"},{"_id":"63451","publisher":"AIP Publishing","user_id":"27150","volume":3,"status":"public","oa":"1","citation":{"short":"T. Schapeler, I. Mischke, F. Schlue, M. Stefszky, B. Brecht, C. Silberhorn, T. Bartley, APL Quantum 3 (2026).","chicago":"Schapeler, Timon, Isabell Mischke, Fabian Schlue, Michael Stefszky, Benjamin Brecht, Christine Silberhorn, and Tim Bartley. “Practical Considerations for Assignment of Photon Numbers with SNSPDs.” APL Quantum 3, no. 1 (2026). https://doi.org/10.1063/5.0304127.","apa":"Schapeler, T., Mischke, I., Schlue, F., Stefszky, M., Brecht, B., Silberhorn, C., & Bartley, T. (2026). Practical considerations for assignment of photon numbers with SNSPDs. APL Quantum, 3(1), Article 016102. https://doi.org/10.1063/5.0304127","ieee":"T. Schapeler et al., “Practical considerations for assignment of photon numbers with SNSPDs,” APL Quantum, vol. 3, no. 1, Art. no. 016102, 2026, doi: 10.1063/5.0304127.","ama":"Schapeler T, Mischke I, Schlue F, et al. Practical considerations for assignment of photon numbers with SNSPDs. APL Quantum. 2026;3(1). doi:10.1063/5.0304127","bibtex":"@article{Schapeler_Mischke_Schlue_Stefszky_Brecht_Silberhorn_Bartley_2026, title={Practical considerations for assignment of photon numbers with SNSPDs}, volume={3}, DOI={10.1063/5.0304127}, number={1016102}, journal={APL Quantum}, publisher={AIP Publishing}, author={Schapeler, Timon and Mischke, Isabell and Schlue, Fabian and Stefszky, Michael and Brecht, Benjamin and Silberhorn, Christine and Bartley, Tim}, year={2026} }","mla":"Schapeler, Timon, et al. “Practical Considerations for Assignment of Photon Numbers with SNSPDs.” APL Quantum, vol. 3, no. 1, 016102, AIP Publishing, 2026, doi:10.1063/5.0304127."},"project":[{"_id":"191","name":"PhoQuant: Photonische Quantencomputer - Quantencomputing Testplattform"},{"name":"ERC-Grant: QuESADILLA: Quantum Engineering Superconducting Array Detectors in Low-Light Applications","_id":"239"}],"main_file_link":[{"open_access":"1"}],"article_number":"016102","language":[{"iso":"eng"}],"doi":"10.1063/5.0304127","year":"2026","title":"Practical considerations for assignment of photon numbers with SNSPDs","publication_identifier":{"issn":["2835-0103"]},"author":[{"full_name":"Schapeler, Timon","orcid":"0000-0001-7652-1716","last_name":"Schapeler","first_name":"Timon","id":"55629"},{"last_name":"Mischke","first_name":"Isabell","full_name":"Mischke, Isabell"},{"full_name":"Schlue, Fabian","last_name":"Schlue","first_name":"Fabian","id":"63579"},{"id":"42777","first_name":"Michael","last_name":"Stefszky","full_name":"Stefszky, Michael"},{"id":"27150","full_name":"Brecht, Benjamin","orcid":"0000-0003-4140-0556 ","last_name":"Brecht","first_name":"Benjamin"},{"id":"26263","full_name":"Silberhorn, Christine","first_name":"Christine","last_name":"Silberhorn"},{"id":"49683","first_name":"Tim","last_name":"Bartley","full_name":"Bartley, Tim"}],"date_updated":"2026-03-25T08:00:27Z","publication_status":"published","intvolume":" 3","date_created":"2026-01-05T10:00:58Z","type":"journal_article","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"publication":"APL Quantum","issue":"1","abstract":[{"lang":"eng","text":"Superconducting nanowire single-photon detectors (SNSPDs) can enable photon-number resolution (PNR) based on accurate measurements of the detector’s response time to few-photon optical pulses. In this work, we investigate the impact of the optical pulse shape and duration on the accuracy of this method. We find that Gaussian temporal pulse shapes yield cleaner arrival-time histograms and, thus, more accurate PNR, compared to bandpass-filtered pulses of equal bandwidth. For low system jitter and an optical pulse duration comparable to the other jitter contributions, photon numbers can be discriminated in our system with a commercial SNSPD. At 60 ps optical pulse duration, photon-number discrimination is significantly reduced. Furthermore, we highlight the importance of using the correct arrival-time histogram model when analyzing photon-number assignment. Using exponentially modified Gaussian distributions, instead of the commonly used Gaussian distributions, we can more accurately determine photon-number misidentification probabilities. Finally, we reconstruct the positive operator-valued measures of the detector, revealing sharp features that indicate the intrinsic PNR capabilities."}]},{"citation":{"ama":"Serino LM, Chesi G, Brecht B, Maccone L, Macchiavello C, Silberhorn C. Experimental entropic uncertainty relations in dimensions three to five. Physical Review A. 2026;113(3). doi:10.1103/f6c4-jtlc","short":"L.M. Serino, G. Chesi, B. Brecht, L. Maccone, C. Macchiavello, C. Silberhorn, Physical Review A 113 (2026).","chicago":"Serino, Laura Maria, Giovanni Chesi, Benjamin Brecht, Lorenzo Maccone, Chiara Macchiavello, and Christine Silberhorn. “Experimental Entropic Uncertainty Relations in Dimensions Three to Five.” Physical Review A 113, no. 3 (2026). https://doi.org/10.1103/f6c4-jtlc.","bibtex":"@article{Serino_Chesi_Brecht_Maccone_Macchiavello_Silberhorn_2026, title={Experimental entropic uncertainty relations in dimensions three to five}, volume={113}, DOI={10.1103/f6c4-jtlc}, number={3032420}, journal={Physical Review A}, 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={2026} }","apa":"Serino, L. M., Chesi, G., Brecht, B., Maccone, L., Macchiavello, C., & Silberhorn, C. (2026). Experimental entropic uncertainty relations in dimensions three to five. Physical Review A, 113(3), Article 032420. https://doi.org/10.1103/f6c4-jtlc","mla":"Serino, Laura Maria, et al. “Experimental Entropic Uncertainty Relations in Dimensions Three to Five.” Physical Review A, vol. 113, no. 3, 032420, American Physical Society (APS), 2026, doi:10.1103/f6c4-jtlc.","ieee":"L. M. Serino, G. Chesi, B. Brecht, L. Maccone, C. Macchiavello, and C. Silberhorn, “Experimental entropic uncertainty relations in dimensions three to five,” Physical Review A, vol. 113, no. 3, Art. no. 032420, 2026, doi: 10.1103/f6c4-jtlc."},"status":"public","publisher":"American Physical Society (APS)","_id":"65095","user_id":"27150","volume":113,"publication":"Physical Review A","issue":"3","abstract":[{"lang":"eng","text":"\r\n We provide experimental validation of tight entropic uncertainty relations for the Shannon entropies of observables with mutually unbiased eigenstates in high dimensions. In particular, we address the cases of dimensions\r\n \r\n \r\n d\r\n =\r\n 3\r\n \r\n \r\n , 4, and 5 and consider from 2 to\r\n \r\n \r\n d\r\n +\r\n 1\r\n \r\n \r\n mutually unbiased bases. The experiment is based on pulsed frequency bins measured with a multioutput quantum pulse gate, which can perform projective measurements on a complete high-dimensional basis in the time-frequency domain. Our results fit the theoretical predictions: the bound on the sum of the entropies is never violated and is saturated by the states that minimize the uncertainty relations.\r\n "}],"date_created":"2026-03-23T12:29:23Z","type":"journal_article","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"title":"Experimental entropic uncertainty relations in dimensions three to five","year":"2026","author":[{"id":"88242","full_name":"Serino, Laura Maria","first_name":"Laura Maria","last_name":"Serino"},{"full_name":"Chesi, Giovanni","first_name":"Giovanni","last_name":"Chesi"},{"id":"27150","full_name":"Brecht, Benjamin","orcid":"0000-0003-4140-0556 ","first_name":"Benjamin","last_name":"Brecht"},{"full_name":"Maccone, Lorenzo","last_name":"Maccone","first_name":"Lorenzo"},{"full_name":"Macchiavello, Chiara","first_name":"Chiara","last_name":"Macchiavello"},{"first_name":"Christine","last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263"}],"publication_identifier":{"issn":["2469-9926","2469-9934"]},"date_updated":"2026-03-25T07:59:36Z","publication_status":"published","intvolume":" 113","article_number":"032420","language":[{"iso":"eng"}],"doi":"10.1103/f6c4-jtlc"},{"status":"public","user_id":"75127","volume":25,"_id":"65575","publisher":"American Physical Society (APS)","citation":{"chicago":"Lammers, Jonas, Laura Ares, Federico Pegoraro, Philip Held, Benjamin Brecht, Jan Sperling, and Christine Silberhorn. “Resource-Efficient Universal Photonic Processors Based on Time-Multiplexed Hybrid Architectures.” Physical Review Applied 25, no. 5 (2026). https://doi.org/10.1103/x99y-2sms.","short":"J. Lammers, L. Ares, F. Pegoraro, P. Held, B. Brecht, J. Sperling, C. Silberhorn, Physical Review Applied 25 (2026).","ieee":"J. Lammers et al., “Resource-efficient universal photonic processors based on time-multiplexed hybrid architectures,” Physical Review Applied, vol. 25, no. 5, Art. no. 054011, 2026, doi: 10.1103/x99y-2sms.","apa":"Lammers, J., Ares, L., Pegoraro, F., Held, P., Brecht, B., Sperling, J., & Silberhorn, C. (2026). Resource-efficient universal photonic processors based on time-multiplexed hybrid architectures. Physical Review Applied, 25(5), Article 054011. https://doi.org/10.1103/x99y-2sms","bibtex":"@article{Lammers_Ares_Pegoraro_Held_Brecht_Sperling_Silberhorn_2026, title={Resource-efficient universal photonic processors based on time-multiplexed hybrid architectures}, volume={25}, DOI={10.1103/x99y-2sms}, number={5054011}, journal={Physical Review Applied}, publisher={American Physical Society (APS)}, author={Lammers, Jonas and Ares, Laura and Pegoraro, Federico and Held, Philip and Brecht, Benjamin and Sperling, Jan and Silberhorn, Christine}, year={2026} }","ama":"Lammers J, Ares L, Pegoraro F, et al. Resource-efficient universal photonic processors based on time-multiplexed hybrid architectures. Physical Review Applied. 2026;25(5). doi:10.1103/x99y-2sms","mla":"Lammers, Jonas, et al. “Resource-Efficient Universal Photonic Processors Based on Time-Multiplexed Hybrid Architectures.” Physical Review Applied, vol. 25, no. 5, 054011, American Physical Society (APS), 2026, doi:10.1103/x99y-2sms."},"date_updated":"2026-05-07T07:01:09Z","publication_status":"published","intvolume":" 25","year":"2026","title":"Resource-efficient universal photonic processors based on time-multiplexed hybrid architectures","publication_identifier":{"issn":["2331-7019"]},"author":[{"full_name":"Lammers, Jonas","first_name":"Jonas","last_name":"Lammers"},{"first_name":"Laura","last_name":"Ares","full_name":"Ares, Laura"},{"id":"88928","full_name":"Pegoraro, Federico","first_name":"Federico","last_name":"Pegoraro"},{"first_name":"Philip","last_name":"Held","full_name":"Held, Philip","id":"68236"},{"id":"27150","full_name":"Brecht, Benjamin","orcid":"0000-0003-4140-0556 ","first_name":"Benjamin","last_name":"Brecht"},{"full_name":"Sperling, Jan","first_name":"Jan","orcid":"0000-0002-5844-3205","last_name":"Sperling","id":"75127"},{"first_name":"Christine","last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263"}],"doi":"10.1103/x99y-2sms","article_number":"054011","language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"For the ever-growing field of quantum information processing, large-scale, efficient multiport interferometers serving as photonic processors are required. In this context, the suitability of quantum walks as the interferometric base for universal computation has been theoretically proven. In this work, we bridge the gap between theoretical proposals and state-of-the-art experimental capabilities by providing the recipe for the implementation of a universal photonic processor in discrete-time quantum walks. Specifically, we present the protocol for translating arbitrary linear transformations into the coin and step operator of a quantum walk and map these to the experimental parameters of the established time-multiplexed platform [A. Schreiber , Phys. Rev. Lett. , 050502 (2010)]. We show that our interface is highly scalable and resource efficient due to the hybrid encoding consisting of multiple degrees of freedom. Finally, we prove that our system is highly resilient against experimental imperfections and show that it compares favorably against existing architectures."}],"issue":"5","publication":"Physical Review Applied","type":"journal_article","department":[{"_id":"623"},{"_id":"15"},{"_id":"170"},{"_id":"706"},{"_id":"429"}],"date_created":"2026-05-07T07:00:08Z"},{"type":"journal_article","department":[{"_id":"288"},{"_id":"623"},{"_id":"15"}],"date_created":"2026-06-12T08:14:35Z","abstract":[{"lang":"eng","text":"Simulating vibronic spectra is a central task in physical chemistry, offering insight into important properties of molecules. Recently, it has been experimentally demonstrated that photonic platforms based on Gaussian boson sampling (GBS) are capable of performing these simulations. However, whether an actual GBS approach is required depends on the molecule under investigation. To develop a better understanding on the requirements for simulating vibronic spectra, we explore connections between theoretical approximations in physical chemistry and their photonic counterparts. Mapping these approximations into photonics, we show that for certain molecules the GBS approach is unnecessary. We place special emphasis on the linear coupling approximation, which in photonics corresponds to sampling from multiple coherent states. By implementing this approach in experiments, we demonstrate improved similarities over previously reported GBS results for formic acid and identify the particular attributes that a molecule must exhibit for this, and other approximations, to be valid. These results highlight the importance in forming deeper connections between traditional methods and photonic approaches."}],"related_material":{"link":[{"url":"https://doi.org/10.5281/zenodo.18969354","relation":"research_data"}]},"issue":"1","publication":"npj Quantum Information","doi":"10.1038/s41534-026-01250-x","main_file_link":[{"url":"https://www.nature.com/articles/s41534-026-01250-x.pdf","open_access":"1"}],"article_number":"89","language":[{"iso":"eng"}],"date_updated":"2026-06-12T08:28:02Z","publication_status":"published","intvolume":" 12","article_type":"original","title":"Bridging chemistry and Gaussian boson sampling: a photonic hierarchy of approximations for molecular vibronic spectra","year":"2026","author":[{"id":"73665","first_name":"Jan-Lucas","orcid":"0009-0008-6524-7684","last_name":"Eickmann","full_name":"Eickmann, Jan-Lucas"},{"id":"36389","first_name":"Kai-Hong","last_name":"Luo","orcid":"0000-0003-1008-4976","full_name":"Luo, Kai-Hong"},{"id":"114114","full_name":"Roiz, Mikhail","last_name":"Roiz","first_name":"Mikhail"},{"full_name":"Lammers, Jonas","last_name":"Lammers","first_name":"Jonas"},{"id":"98338","full_name":"Atzeni, Simone","last_name":"Atzeni","first_name":"Simone"},{"full_name":"Pandey, Cheeranjiv","first_name":"Cheeranjiv","last_name":"Pandey"},{"first_name":"Florian","last_name":"Lütkewitte","full_name":"Lütkewitte, Florian"},{"full_name":"Shirazi, Reza G.","last_name":"Shirazi","first_name":"Reza G."},{"id":"63579","first_name":"Fabian","last_name":"Schlue","full_name":"Schlue, Fabian"},{"first_name":"Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 ","full_name":"Brecht, Benjamin","id":"27150"},{"first_name":"Vladimir V.","last_name":"Rybkin","full_name":"Rybkin, Vladimir V."},{"id":"42777","last_name":"Stefszky","first_name":"Michael","full_name":"Stefszky, Michael"},{"full_name":"Silberhorn, Christine","first_name":"Christine","last_name":"Silberhorn","id":"26263"}],"publication_identifier":{"issn":["2056-6387"]},"oa":"1","project":[{"name":"PhoQuant: Photonische Quantencomputer - Quantencomputing Testplattform","_id":"191"}],"citation":{"ieee":"J.-L. Eickmann et al., “Bridging chemistry and Gaussian boson sampling: a photonic hierarchy of approximations for molecular vibronic spectra,” npj Quantum Information, vol. 12, no. 1, Art. no. 89, 2026, doi: 10.1038/s41534-026-01250-x.","apa":"Eickmann, J.-L., Luo, K.-H., Roiz, M., Lammers, J., Atzeni, S., Pandey, C., Lütkewitte, F., Shirazi, R. G., Schlue, F., Brecht, B., Rybkin, V. V., Stefszky, M., & Silberhorn, C. (2026). Bridging chemistry and Gaussian boson sampling: a photonic hierarchy of approximations for molecular vibronic spectra. Npj Quantum Information, 12(1), Article 89. https://doi.org/10.1038/s41534-026-01250-x","chicago":"Eickmann, Jan-Lucas, Kai-Hong Luo, Mikhail Roiz, Jonas Lammers, Simone Atzeni, Cheeranjiv Pandey, Florian Lütkewitte, et al. “Bridging Chemistry and Gaussian Boson Sampling: A Photonic Hierarchy of Approximations for Molecular Vibronic Spectra.” Npj Quantum Information 12, no. 1 (2026). https://doi.org/10.1038/s41534-026-01250-x.","short":"J.-L. Eickmann, K.-H. Luo, M. Roiz, J. Lammers, S. Atzeni, C. Pandey, F. Lütkewitte, R.G. Shirazi, F. Schlue, B. Brecht, V.V. Rybkin, M. Stefszky, C. Silberhorn, Npj Quantum Information 12 (2026).","mla":"Eickmann, Jan-Lucas, et al. “Bridging Chemistry and Gaussian Boson Sampling: A Photonic Hierarchy of Approximations for Molecular Vibronic Spectra.” Npj Quantum Information, vol. 12, no. 1, 89, Springer Science and Business Media LLC, 2026, doi:10.1038/s41534-026-01250-x.","bibtex":"@article{Eickmann_Luo_Roiz_Lammers_Atzeni_Pandey_Lütkewitte_Shirazi_Schlue_Brecht_et al._2026, title={Bridging chemistry and Gaussian boson sampling: a photonic hierarchy of approximations for molecular vibronic spectra}, volume={12}, DOI={10.1038/s41534-026-01250-x}, number={189}, journal={npj Quantum Information}, publisher={Springer Science and Business Media LLC}, author={Eickmann, Jan-Lucas and Luo, Kai-Hong and Roiz, Mikhail and Lammers, Jonas and Atzeni, Simone and Pandey, Cheeranjiv and Lütkewitte, Florian and Shirazi, Reza G. and Schlue, Fabian and Brecht, Benjamin and et al.}, year={2026} }","ama":"Eickmann J-L, Luo K-H, Roiz M, et al. Bridging chemistry and Gaussian boson sampling: a photonic hierarchy of approximations for molecular vibronic spectra. npj Quantum Information. 2026;12(1). doi:10.1038/s41534-026-01250-x"},"user_id":"73665","volume":12,"publisher":"Springer Science and Business Media LLC","_id":"65847","status":"public"},{"volume":114,"user_id":"78890","_id":"66583","publisher":"American Physical Society (APS)","status":"public","oa":"1","citation":{"ama":"Pollmann R, Roeder F, Silberhorn C, Brecht B. Limitations of entangled two-photon absorption detection. Physical Review A. 2026;114(1). doi:10.1103/qpb1-hk5l","bibtex":"@article{Pollmann_Roeder_Silberhorn_Brecht_2026, title={Limitations of entangled two-photon absorption detection}, volume={114}, DOI={10.1103/qpb1-hk5l}, number={1013718}, journal={Physical Review A}, publisher={American Physical Society (APS)}, author={Pollmann, René and Roeder, Franz and Silberhorn, Christine and Brecht, Benjamin}, year={2026} }","mla":"Pollmann, René, et al. “Limitations of Entangled Two-Photon Absorption Detection.” Physical Review A, vol. 114, no. 1, 013718, American Physical Society (APS), 2026, doi:10.1103/qpb1-hk5l.","chicago":"Pollmann, René, Franz Roeder, Christine Silberhorn, and Benjamin Brecht. “Limitations of Entangled Two-Photon Absorption Detection.” Physical Review A 114, no. 1 (2026). https://doi.org/10.1103/qpb1-hk5l.","short":"R. Pollmann, F. Roeder, C. Silberhorn, B. Brecht, Physical Review A 114 (2026).","apa":"Pollmann, R., Roeder, F., Silberhorn, C., & Brecht, B. (2026). Limitations of entangled two-photon absorption detection. Physical Review A, 114(1), Article 013718. https://doi.org/10.1103/qpb1-hk5l","ieee":"R. Pollmann, F. Roeder, C. Silberhorn, and B. Brecht, “Limitations of entangled two-photon absorption detection,” Physical Review A, vol. 114, no. 1, Art. no. 013718, 2026, doi: 10.1103/qpb1-hk5l."},"doi":"10.1103/qpb1-hk5l","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://journals.aps.org/pra/abstract/10.1103/qpb1-hk5l","open_access":"1"}],"article_number":"013718","intvolume":" 114","article_type":"original","date_updated":"2026-07-24T11:00:08Z","publication_status":"published","author":[{"full_name":"Pollmann, René","last_name":"Pollmann","first_name":"René","id":"78890"},{"first_name":"Franz","last_name":"Roeder","full_name":"Roeder, Franz","id":"88149"},{"last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263"},{"first_name":"Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 ","full_name":"Brecht, Benjamin","id":"27150"}],"publication_identifier":{"issn":["2469-9926","2469-9934"]},"year":"2026","title":"Limitations of entangled two-photon absorption detection","department":[{"_id":"623"},{"_id":"15"}],"type":"journal_article","date_created":"2026-07-24T10:53:18Z","abstract":[{"text":"We introduce a method for determining the sensitivity of any given entangled two-photon absorption (ETPA) measurement. By modeling all signal and noise contributions to the measurement, we derive a single numerical value that describes the sensitivity of the ETPA measurement in Göppert-Mayer units. This allows us to directly compare vastly different experimental approaches and determine whether ETPA will be detectable under the given conditions. Therefore we can quantify the effect of any change to a given experimental apparatus and identify the ideal optimization pathway.","lang":"eng"}],"issue":"1","publication":"Physical Review A"},{"citation":{"ieee":"M. Houde, F. Roeder, C. Silberhorn, B. Brecht, and N. Quesada, “High-gain effects in broadband continuous-wave parametric down conversion sources and measurements with undetected photons,” New Journal of Physics, vol. 28, no. 7, Art. no. 074509, 2026, doi: 10.1088/1367-2630/ae8692.","apa":"Houde, M., Roeder, F., Silberhorn, C., Brecht, B., & Quesada, N. (2026). High-gain effects in broadband continuous-wave parametric down conversion sources and measurements with undetected photons. New Journal of Physics, 28(7), Article 074509. https://doi.org/10.1088/1367-2630/ae8692","chicago":"Houde, Martin, Franz Roeder, Christine Silberhorn, Benjamin Brecht, and Nicolás Quesada. “High-Gain Effects in Broadband Continuous-Wave Parametric down Conversion Sources and Measurements with Undetected Photons.” New Journal of Physics 28, no. 7 (2026). https://doi.org/10.1088/1367-2630/ae8692.","short":"M. Houde, F. Roeder, C. Silberhorn, B. Brecht, N. Quesada, New Journal of Physics 28 (2026).","mla":"Houde, Martin, et al. “High-Gain Effects in Broadband Continuous-Wave Parametric down Conversion Sources and Measurements with Undetected Photons.” New Journal of Physics, vol. 28, no. 7, 074509, IOP Publishing, 2026, doi:10.1088/1367-2630/ae8692.","bibtex":"@article{Houde_Roeder_Silberhorn_Brecht_Quesada_2026, title={High-gain effects in broadband continuous-wave parametric down conversion sources and measurements with undetected photons}, volume={28}, DOI={10.1088/1367-2630/ae8692}, number={7074509}, journal={New Journal of Physics}, publisher={IOP Publishing}, author={Houde, Martin and Roeder, Franz and Silberhorn, Christine and Brecht, Benjamin and Quesada, Nicolás}, year={2026} }","ama":"Houde M, Roeder F, Silberhorn C, Brecht B, Quesada N. High-gain effects in broadband continuous-wave parametric down conversion sources and measurements with undetected photons. New Journal of Physics. 2026;28(7). doi:10.1088/1367-2630/ae8692"},"status":"public","volume":28,"user_id":"27150","publisher":"IOP Publishing","_id":"66741","abstract":[{"lang":"eng","text":"Abstract\r\n \r\n We study theoretically how high-gain effects affect the measurement outcome of visible signal spectra in undetected photon measurement schemes. We consider two interferometric configurations: firstly, the SU(1,1) interferometer where the idler incurs loss and additional dispersion in between two identical, lossless, squeezers; secondly, the induced coherence interferometer where the idler incurs loss and additional dispersion in between two identical, lossless, squeezers and where the second squeezer is seeded by the idler and a vacuum ancilla mode. Furthermore, we consider a distributed loss configuration where the idler incurs loss as it propagates in the nonlinear medium. Motivated by experimental evidence and due to the fact that broadband sources are ideal for these measurement schemes, we use the dispersive data of a third-order dispersion engineered integrated waveguide parametric down conversion (PDC) source presented in Roeder\r\n et al\r\n (2024 New J. Phys.\r\n 26\r\n 123025) to model the PDC spectra in the three configurations. For each configuration we consider the case of idler-only (i) absorption, (ii) additional dispersion, and (iii) the combined effects. We obtain results which outline the strength and weaknesses of the different configurations at different operation points.\r\n "}],"publication":"New Journal of Physics","issue":"7","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"type":"journal_article","date_created":"2026-08-18T10:21:08Z","intvolume":" 28","publication_status":"published","date_updated":"2026-08-18T10:21:29Z","publication_identifier":{"issn":["1367-2630"]},"author":[{"full_name":"Houde, Martin","last_name":"Houde","first_name":"Martin"},{"id":"88149","first_name":"Franz","last_name":"Roeder","full_name":"Roeder, Franz"},{"last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263"},{"id":"27150","full_name":"Brecht, Benjamin","orcid":"0000-0003-4140-0556 ","last_name":"Brecht","first_name":"Benjamin"},{"full_name":"Quesada, Nicolás","last_name":"Quesada","first_name":"Nicolás"}],"year":"2026","title":"High-gain effects in broadband continuous-wave parametric down conversion sources and measurements with undetected photons","doi":"10.1088/1367-2630/ae8692","language":[{"iso":"eng"}],"article_number":"074509"},{"user_id":"27150","volume":8,"publisher":"IOP Publishing","_id":"66740","status":"public","citation":{"short":"M. Houde, F. Roeder, C. Silberhorn, B. Brecht, N. Quesada, Journal of Physics: Photonics 8 (2026).","chicago":"Houde, Martin, Franz Roeder, Christine Silberhorn, Benjamin Brecht, and Nicolás Quesada. “Quantum Fisher Information Analysis for Absorption Measurements with Undetected Photons.” Journal of Physics: Photonics 8, no. 3 (2026). https://doi.org/10.1088/2515-7647/ae82a2.","apa":"Houde, M., Roeder, F., Silberhorn, C., Brecht, B., & Quesada, N. (2026). Quantum fisher information analysis for absorption measurements with undetected photons. Journal of Physics: Photonics, 8(3), Article 035013. https://doi.org/10.1088/2515-7647/ae82a2","ieee":"M. Houde, F. Roeder, C. Silberhorn, B. Brecht, and N. Quesada, “Quantum fisher information analysis for absorption measurements with undetected photons,” Journal of Physics: Photonics, vol. 8, no. 3, Art. no. 035013, 2026, doi: 10.1088/2515-7647/ae82a2.","ama":"Houde M, Roeder F, Silberhorn C, Brecht B, Quesada N. Quantum fisher information analysis for absorption measurements with undetected photons. Journal of Physics: Photonics. 2026;8(3). doi:10.1088/2515-7647/ae82a2","bibtex":"@article{Houde_Roeder_Silberhorn_Brecht_Quesada_2026, title={Quantum fisher information analysis for absorption measurements with undetected photons}, volume={8}, DOI={10.1088/2515-7647/ae82a2}, number={3035013}, journal={Journal of Physics: Photonics}, publisher={IOP Publishing}, author={Houde, Martin and Roeder, Franz and Silberhorn, Christine and Brecht, Benjamin and Quesada, Nicolás}, year={2026} }","mla":"Houde, Martin, et al. “Quantum Fisher Information Analysis for Absorption Measurements with Undetected Photons.” Journal of Physics: Photonics, vol. 8, no. 3, 035013, IOP Publishing, 2026, doi:10.1088/2515-7647/ae82a2."},"doi":"10.1088/2515-7647/ae82a2","article_number":"035013","language":[{"iso":"eng"}],"publication_status":"published","date_updated":"2026-08-18T10:20:54Z","intvolume":" 8","title":"Quantum fisher information analysis for absorption measurements with undetected photons","year":"2026","publication_identifier":{"issn":["2515-7647"]},"author":[{"full_name":"Houde, Martin","first_name":"Martin","last_name":"Houde"},{"id":"88149","first_name":"Franz","last_name":"Roeder","full_name":"Roeder, Franz"},{"last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263"},{"id":"27150","orcid":"0000-0003-4140-0556 ","first_name":"Benjamin","last_name":"Brecht","full_name":"Brecht, Benjamin"},{"first_name":"Nicolás","last_name":"Quesada","full_name":"Quesada, Nicolás"}],"type":"journal_article","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"date_created":"2026-08-18T10:20:21Z","abstract":[{"lang":"eng","text":"Abstract\r\n \r\n We theoretically compare the quantum Fisher information (QFI) for three configurations of absorption spectroscopy with undetected idler photons: an SU(1,1) interferometer with inter-source idler loss, an induced-coherence (IC) setup in which the idler partially seeds a second squeezer together with a vacuum ancilla, and a distributed-loss (DL) scheme with in-medium attenuation. We calculate the QFI as a function of parametric gain for both full and signal-only detection access. For losses below 99% and low to moderate gain, the SU(1,1) configuration provides the largest QFI. At high gain and intermediate loss, the IC scheme performs best, while under extreme attenuation (transmission\r\n \r\n \r\n \r\n \r\n \r\n \r\n <\r\n \r\n \r\n \r\n 1%) the DL model becomes optimal. These results delineate the measurement regimes in which each architecture is optimal in terms of information theory.\r\n "}],"issue":"3","publication":"Journal of Physics: Photonics"},{"citation":{"bibtex":"@article{Pegoraro_Held_Lammers_Brecht_Silberhorn_2026, title={Demonstration of a quantum C-NOT gate in a time-multiplexed fully reconfigurable photonic processor}, volume={17}, DOI={10.1038/s41467-026-74861-9}, number={15683}, journal={Nature Communications}, publisher={Springer Science and Business Media LLC}, author={Pegoraro, Federico and Held, Philip and Lammers, Jonas and Brecht, Benjamin and Silberhorn, Christine}, year={2026} }","ama":"Pegoraro F, Held P, Lammers J, Brecht B, Silberhorn C. Demonstration of a quantum C-NOT gate in a time-multiplexed fully reconfigurable photonic processor. Nature Communications. 2026;17(1). doi:10.1038/s41467-026-74861-9","mla":"Pegoraro, Federico, et al. “Demonstration of a Quantum C-NOT Gate in a Time-Multiplexed Fully Reconfigurable Photonic Processor.” Nature Communications, vol. 17, no. 1, 5683, Springer Science and Business Media LLC, 2026, doi:10.1038/s41467-026-74861-9.","chicago":"Pegoraro, Federico, Philip Held, Jonas Lammers, Benjamin Brecht, and Christine Silberhorn. “Demonstration of a Quantum C-NOT Gate in a Time-Multiplexed Fully Reconfigurable Photonic Processor.” Nature Communications 17, no. 1 (2026). https://doi.org/10.1038/s41467-026-74861-9.","short":"F. Pegoraro, P. Held, J. Lammers, B. Brecht, C. Silberhorn, Nature Communications 17 (2026).","ieee":"F. Pegoraro, P. Held, J. Lammers, B. Brecht, and C. Silberhorn, “Demonstration of a quantum C-NOT gate in a time-multiplexed fully reconfigurable photonic processor,” Nature Communications, vol. 17, no. 1, Art. no. 5683, 2026, doi: 10.1038/s41467-026-74861-9.","apa":"Pegoraro, F., Held, P., Lammers, J., Brecht, B., & Silberhorn, C. (2026). Demonstration of a quantum C-NOT gate in a time-multiplexed fully reconfigurable photonic processor. Nature Communications, 17(1), Article 5683. https://doi.org/10.1038/s41467-026-74861-9"},"oa":"1","status":"public","user_id":"88928","volume":17,"_id":"66094","publisher":"Springer Science and Business Media LLC","abstract":[{"text":"The two-qubit controlled-not (C-NOT) gate is an essential component for gate-based quantum circuits. In fact, its operation, combined with single qubit rotations allows to realise any quantum circuit. Several strategies have been adopted in order to build quantum gates. Among them, photonics offers the dual advantage of excellent isolation from the environment and ease of manipulation at the single qubit level. Here we adopt a scalable time-multiplexed approach in order to build a fully reconfigurable architecture capable of implementing a post-selected C-NOT gate with a fidelity of (93.8 ± 1.4)%. We then show how our time-multiplexed platform can be employed to combine a C-NOT and a single qubit gate in order to generate the four Bell states.","lang":"eng"}],"related_material":{"link":[{"description":"Supplementary notes to the main article","url":"https://static-content.springer.com/esm/art%3A10.1038%2Fs41467-026-74861-9/MediaObjects/41467_2026_74861_MOESM1_ESM.pdf","relation":"supplementary_material"},{"description":"Datasets and code","relation":"supplementary_material","url":"https://doi.org/10.5281/zenodo.20396394"}]},"publication":"Nature Communications","issue":"1","type":"journal_article","keyword":["Photonic Quantum Computing","Time-multiplexing","Quantum Information"],"department":[{"_id":"288"},{"_id":"623"},{"_id":"15"}],"date_created":"2026-07-01T07:47:15Z","publication_status":"published","date_updated":"2026-07-01T08:15:21Z","article_type":"original","intvolume":" 17","year":"2026","title":"Demonstration of a quantum C-NOT gate in a time-multiplexed fully reconfigurable photonic processor","publication_identifier":{"issn":["2041-1723"]},"author":[{"id":"88928","last_name":"Pegoraro","first_name":"Federico","full_name":"Pegoraro, Federico"},{"id":"68236","last_name":"Held","first_name":"Philip","full_name":"Held, Philip"},{"full_name":"Lammers, Jonas","last_name":"Lammers","first_name":"Jonas"},{"id":"27150","full_name":"Brecht, Benjamin","first_name":"Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 "},{"id":"26263","last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine"}],"doi":"10.1038/s41467-026-74861-9","article_number":"5683","main_file_link":[{"url":"https://www.nature.com/articles/s41467-026-74861-9","open_access":"1"}],"language":[{"iso":"eng"}]},{"status":"public","publisher":"Walter de Gruyter GmbH","_id":"63734","page":"1775-1782","volume":14,"user_id":"106751","citation":{"ieee":"S. Kapoor et al., “Electro-optic frequency shift of single photons from a quantum dot,” Nanophotonics, vol. 14, no. 11, pp. 1775–1782, 2025, doi: 10.1515/nanoph-2024-0550.","apa":"Kapoor, S., Rodek, A., Mikołajczyk, M., Szuniewicz, J., Sośnicki, F. M., Kazimierczuk, T., Kossacki, P., & Karpiński, M. (2025). Electro-optic frequency shift of single photons from a quantum dot. Nanophotonics, 14(11), 1775–1782. https://doi.org/10.1515/nanoph-2024-0550","short":"S. Kapoor, A. Rodek, M. Mikołajczyk, J. Szuniewicz, F.M. Sośnicki, T. Kazimierczuk, P. Kossacki, M. Karpiński, Nanophotonics 14 (2025) 1775–1782.","chicago":"Kapoor, Sanjay, Aleksander Rodek, Michał Mikołajczyk, Jerzy Szuniewicz, Filip Maksymilian Sośnicki, Tomasz Kazimierczuk, Piotr Kossacki, and Michał Karpiński. “Electro-Optic Frequency Shift of Single Photons from a Quantum Dot.” Nanophotonics 14, no. 11 (2025): 1775–82. https://doi.org/10.1515/nanoph-2024-0550.","mla":"Kapoor, Sanjay, et al. “Electro-Optic Frequency Shift of Single Photons from a Quantum Dot.” Nanophotonics, vol. 14, no. 11, Walter de Gruyter GmbH, 2025, pp. 1775–82, doi:10.1515/nanoph-2024-0550.","bibtex":"@article{Kapoor_Rodek_Mikołajczyk_Szuniewicz_Sośnicki_Kazimierczuk_Kossacki_Karpiński_2025, title={Electro-optic frequency shift of single photons from a quantum dot}, volume={14}, DOI={10.1515/nanoph-2024-0550}, number={11}, journal={Nanophotonics}, publisher={Walter de Gruyter GmbH}, author={Kapoor, Sanjay and Rodek, Aleksander and Mikołajczyk, Michał and Szuniewicz, Jerzy and Sośnicki, Filip Maksymilian and Kazimierczuk, Tomasz and Kossacki, Piotr and Karpiński, Michał}, year={2025}, pages={1775–1782} }","ama":"Kapoor S, Rodek A, Mikołajczyk M, et al. Electro-optic frequency shift of single photons from a quantum dot. Nanophotonics. 2025;14(11):1775-1782. doi:10.1515/nanoph-2024-0550"},"publication_identifier":{"issn":["2192-8614"]},"author":[{"full_name":"Kapoor, Sanjay","first_name":"Sanjay","last_name":"Kapoor"},{"full_name":"Rodek, Aleksander","first_name":"Aleksander","last_name":"Rodek"},{"full_name":"Mikołajczyk, Michał","last_name":"Mikołajczyk","first_name":"Michał"},{"full_name":"Szuniewicz, Jerzy","last_name":"Szuniewicz","first_name":"Jerzy"},{"orcid":"0000-0002-2465-4645","first_name":"Filip Maksymilian","last_name":"Sośnicki","full_name":"Sośnicki, Filip Maksymilian","id":"106751"},{"full_name":"Kazimierczuk, Tomasz","first_name":"Tomasz","last_name":"Kazimierczuk"},{"first_name":"Piotr","last_name":"Kossacki","full_name":"Kossacki, Piotr"},{"full_name":"Karpiński, Michał","last_name":"Karpiński","first_name":"Michał"}],"title":"Electro-optic frequency shift of single photons from a quantum dot","year":"2025","article_type":"original","intvolume":" 14","publication_status":"published","date_updated":"2026-01-26T14:35:42Z","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://www.degruyterbrill.com/document/doi/10.1515/nanoph-2024-0550/html"}],"doi":"10.1515/nanoph-2024-0550","publication":"Nanophotonics","issue":"11","abstract":[{"lang":"eng","text":"Quantum dots (QDs) are a promising source of single photons mainly due to their on-demand operation. However, their emission wavelength depends on their size and immediate surroundings in the solid-state environment. By applying a serrodyne electro-optic phase modulation, we achieve a spectral shift up to 0.01 nm (3.5 GHz) while preserving the purity and indistinguishability of the photons. This method provides an efficient and scalable approach for tuning the emission wavelength of QDs without relying on nonlinear frequency mixing or probabilistic processes. Our results show that the electro-optic phase modulation enables stable and tunable spectral shifts, making it suitable for applications such as quantum communication, quantum key distribution, and primarily integrating remote quantum dot sources into large-scale quantum networks."}],"date_created":"2026-01-26T14:34:16Z","department":[{"_id":"623"},{"_id":"288"},{"_id":"15"}],"type":"journal_article"},{"publisher":"AIP Publishing","_id":"63732","volume":10,"user_id":"106751","status":"public","citation":{"bibtex":"@article{Kapoor_Sośnicki_Karpiński_2025, title={Aberration-optimized electro-optic time lens model using a tunable aperture}, volume={10}, DOI={10.1063/5.0270904}, number={9096111}, journal={APL Photonics}, publisher={AIP Publishing}, author={Kapoor, Sanjay and Sośnicki, Filip Maksymilian and Karpiński, Michał}, year={2025} }","ama":"Kapoor S, Sośnicki FM, Karpiński M. Aberration-optimized electro-optic time lens model using a tunable aperture. APL Photonics. 2025;10(9). doi:10.1063/5.0270904","mla":"Kapoor, Sanjay, et al. “Aberration-Optimized Electro-Optic Time Lens Model Using a Tunable Aperture.” APL Photonics, vol. 10, no. 9, 096111, AIP Publishing, 2025, doi:10.1063/5.0270904.","chicago":"Kapoor, Sanjay, Filip Maksymilian Sośnicki, and Michał Karpiński. “Aberration-Optimized Electro-Optic Time Lens Model Using a Tunable Aperture.” APL Photonics 10, no. 9 (2025). https://doi.org/10.1063/5.0270904.","short":"S. Kapoor, F.M. Sośnicki, M. Karpiński, APL Photonics 10 (2025).","ieee":"S. Kapoor, F. M. Sośnicki, and M. Karpiński, “Aberration-optimized electro-optic time lens model using a tunable aperture,” APL Photonics, vol. 10, no. 9, Art. no. 096111, 2025, doi: 10.1063/5.0270904.","apa":"Kapoor, S., Sośnicki, F. M., & Karpiński, M. (2025). Aberration-optimized electro-optic time lens model using a tunable aperture. APL Photonics, 10(9), Article 096111. https://doi.org/10.1063/5.0270904"},"language":[{"iso":"eng"}],"main_file_link":[{"url":"https://pubs.aip.org/aip/app/article/10/9/096111/3364187"}],"article_number":"096111","doi":"10.1063/5.0270904","author":[{"last_name":"Kapoor","first_name":"Sanjay","full_name":"Kapoor, Sanjay"},{"id":"106751","full_name":"Sośnicki, Filip Maksymilian","last_name":"Sośnicki","orcid":"0000-0002-2465-4645","first_name":"Filip Maksymilian"},{"full_name":"Karpiński, Michał","first_name":"Michał","last_name":"Karpiński"}],"publication_identifier":{"issn":["2378-0967"]},"title":"Aberration-optimized electro-optic time lens model using a tunable aperture","year":"2025","intvolume":" 10","article_type":"original","date_updated":"2026-01-26T14:27:42Z","publication_status":"published","date_created":"2026-01-26T14:24:34Z","department":[{"_id":"623"},{"_id":"288"},{"_id":"15"}],"type":"journal_article","publication":"APL Photonics","issue":"9","abstract":[{"lang":"eng","text":"Time lenses have been recognized as crucial components for manipulating ultrafast optical pulses in various applications, from ultrafast spectroscopy to the interfacing of optical quantum systems. A time lens is characterized by its chirp rate, which determines the focusing strength of the time lens, and accurate knowledge of this chirp is critical for precise dispersion compensation and minimizing aberrations. Here, we introduce a tunable time aperture model for sinusoidal time lenses that provides a more accurate estimate of the effective chirp rate without modifying the device. We derive a closed-form expression for the maximum phase error and show how it depends on the time aperture. We experimentally demonstrate a 1.6-fold improvement in spectral bandwidth compression of Gaussian pulses compared to the conventional approach. Our framework offers a practical tool for designing efficient temporal optical systems, benefiting applications in both classical and quantum optics where accurate spectro-temporal shaping is essential."}]},{"publication_status":"published","date_updated":"2025-09-17T16:19:51Z","article_type":"original","intvolume":" 429","year":"2025","title":"Demonstration of domain wall current in MgO-doped lithium niobate single crystals up to 400°C","publication_identifier":{"issn":["0167-2738"]},"author":[{"full_name":"Wulfmeier, Hendrik","first_name":"Hendrik","last_name":"Wulfmeier"},{"last_name":"Yakhnevych","first_name":"Uliana","full_name":"Yakhnevych, Uliana"},{"full_name":"Boekhoff, Cornelius","last_name":"Boekhoff","first_name":"Cornelius"},{"full_name":"Diima, Allan","last_name":"Diima","first_name":"Allan"},{"last_name":"Kunzner","first_name":"Marlo","full_name":"Kunzner, Marlo"},{"first_name":"Leonard M.","last_name":"Verhoff","full_name":"Verhoff, Leonard M."},{"last_name":"Paul","first_name":"Jonas","full_name":"Paul, Jonas"},{"first_name":"Julius","last_name":"Ratzenberger","full_name":"Ratzenberger, Julius"},{"first_name":"Elke","last_name":"Beyreuther","full_name":"Beyreuther, Elke"},{"last_name":"Gössel","first_name":"Joshua","full_name":"Gössel, Joshua"},{"full_name":"Kiseleva, Iuliia","first_name":"Iuliia","last_name":"Kiseleva"},{"last_name":"Rüsing","orcid":"0000-0003-4682-4577","first_name":"Michael","full_name":"Rüsing, Michael","id":"22501"},{"full_name":"Sanna, Simone","last_name":"Sanna","first_name":"Simone"},{"full_name":"Eng, Lukas M.","first_name":"Lukas M.","last_name":"Eng"},{"full_name":"Fritze, Holger","last_name":"Fritze","first_name":"Holger"}],"doi":"10.1016/j.ssi.2025.116949","article_number":"116949","main_file_link":[{"url":"https://doi.org/10.1016/j.ssi.2025.116949","open_access":"1"}],"language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"Conductive ferroelectric domain walls (DWs) represent a promising topical system for the development of nanoelectronic components and device sensors to be operational at elevated temperatures. DWs show very different properties as compared to their hosting bulk crystal, in particular with respect to the high local electrical conductivity. The objective of this work is to demonstrate DW conductivity up to temperatures as high as 400 °C which extends previous studies significantly. Experimental investigation of the DW conductivity of charged, inclined DWs is performed using 5 mol % MgO-doped lithium niobate single crystals. Current–voltage ( ) curves are determined by DC electrometer measurements and impedance spectroscopy and found to be identical. Moreover, impedance spectroscopy enables to recognize artifacts such as damaged electrodes. Temperature dependent measurements over repeated heating cycles reveal two distinct thermal activation energies for a given DW, with the higher of the activation energies only measured at higher temperatures. Depending on the specific sample, the higher activation energy is found above 160 °C to 230 °C. This suggests, in turn, that more than one type of defect/polaron is involved, and that the dominant transport mechanism changes with increasing temperature. First principles atomistic modeling suggests that the conductivity of inclined domain walls cannot be solely explained by the formation of a 2D carrier gas and must be supported by hopping processes. This holds true even at temperatures as high as 400 °C. Our investigations underline the potential to extend DW current based nanoelectronic and sensor applications even into the so-far unexplored temperature range up to 400 °C."}],"publication":"Solid State Ionics","type":"journal_article","department":[{"_id":"15"},{"_id":"288"},{"_id":"623"}],"date_created":"2025-09-17T16:18:18Z","status":"public","user_id":"22501","volume":429,"_id":"61338","publisher":"Elsevier BV","quality_controlled":"1","citation":{"mla":"Wulfmeier, Hendrik, et al. “Demonstration of Domain Wall Current in MgO-Doped Lithium Niobate Single Crystals up to 400°C.” Solid State Ionics, vol. 429, 116949, Elsevier BV, 2025, doi:10.1016/j.ssi.2025.116949.","ama":"Wulfmeier H, Yakhnevych U, Boekhoff C, et al. Demonstration of domain wall current in MgO-doped lithium niobate single crystals up to 400°C. Solid State Ionics. 2025;429. doi:10.1016/j.ssi.2025.116949","bibtex":"@article{Wulfmeier_Yakhnevych_Boekhoff_Diima_Kunzner_Verhoff_Paul_Ratzenberger_Beyreuther_Gössel_et al._2025, title={Demonstration of domain wall current in MgO-doped lithium niobate single crystals up to 400°C}, volume={429}, DOI={10.1016/j.ssi.2025.116949}, number={116949}, journal={Solid State Ionics}, publisher={Elsevier BV}, author={Wulfmeier, Hendrik and Yakhnevych, Uliana and Boekhoff, Cornelius and Diima, Allan and Kunzner, Marlo and Verhoff, Leonard M. and Paul, Jonas and Ratzenberger, Julius and Beyreuther, Elke and Gössel, Joshua and et al.}, year={2025} }","apa":"Wulfmeier, H., Yakhnevych, U., Boekhoff, C., Diima, A., Kunzner, M., Verhoff, L. M., Paul, J., Ratzenberger, J., Beyreuther, E., Gössel, J., Kiseleva, I., Rüsing, M., Sanna, S., Eng, L. M., & Fritze, H. (2025). Demonstration of domain wall current in MgO-doped lithium niobate single crystals up to 400°C. Solid State Ionics, 429, Article 116949. https://doi.org/10.1016/j.ssi.2025.116949","ieee":"H. Wulfmeier et al., “Demonstration of domain wall current in MgO-doped lithium niobate single crystals up to 400°C,” Solid State Ionics, vol. 429, Art. no. 116949, 2025, doi: 10.1016/j.ssi.2025.116949.","short":"H. Wulfmeier, U. Yakhnevych, C. Boekhoff, A. Diima, M. Kunzner, L.M. Verhoff, J. Paul, J. Ratzenberger, E. Beyreuther, J. Gössel, I. Kiseleva, M. Rüsing, S. Sanna, L.M. Eng, H. Fritze, Solid State Ionics 429 (2025).","chicago":"Wulfmeier, Hendrik, Uliana Yakhnevych, Cornelius Boekhoff, Allan Diima, Marlo Kunzner, Leonard M. Verhoff, Jonas Paul, et al. “Demonstration of Domain Wall Current in MgO-Doped Lithium Niobate Single Crystals up to 400°C.” Solid State Ionics 429 (2025). https://doi.org/10.1016/j.ssi.2025.116949."},"oa":"1"},{"ipc":"H03M 1/66","citation":{"mla":"Kruse, Stephan, et al. Optisch Basierter Digital-Analog-Umsetzer. 2025.","bibtex":"@article{Kruse_Silberhorn_Brecht_Schwabe_2025, title={Optisch basierter Digital-Analog-Umsetzer}, author={Kruse, Stephan and Silberhorn, Christine and Brecht, Benjamin and Schwabe, Tobias}, year={2025} }","ama":"Kruse S, Silberhorn C, Brecht B, Schwabe T. Optisch basierter Digital-Analog-Umsetzer. Published online 2025.","ieee":"S. Kruse, C. Silberhorn, B. Brecht, and T. Schwabe, “Optisch basierter Digital-Analog-Umsetzer.” 2025.","apa":"Kruse, S., Silberhorn, C., Brecht, B., & Schwabe, T. (2025). Optisch basierter Digital-Analog-Umsetzer.","short":"S. Kruse, C. Silberhorn, B. Brecht, T. Schwabe, (2025).","chicago":"Kruse, Stephan, Christine Silberhorn, Benjamin Brecht, and Tobias Schwabe. “Optisch Basierter Digital-Analog-Umsetzer,” 2025."},"type":"patent","department":[{"_id":"58"},{"_id":"623"},{"_id":"288"}],"date_created":"2025-11-27T07:00:50Z","date_updated":"2025-11-27T07:07:16Z","ipn":"DE102023212604B3","title":"Optisch basierter Digital-Analog-Umsetzer","year":"2025","status":"public","author":[{"id":"38254","last_name":"Kruse","first_name":"Stephan","full_name":"Kruse, Stephan"},{"last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263"},{"full_name":"Brecht, Benjamin","last_name":"Brecht","first_name":"Benjamin","orcid":"0000-0003-4140-0556 ","id":"27150"},{"full_name":"Schwabe, Tobias","first_name":"Tobias","last_name":"Schwabe","id":"39217"}],"publication_date":"2025-01-23","user_id":"38254","_id":"62639"},{"year":"2025","title":"Phonon dephasing times determined with time-delayed broadband coherent anti-Stokes Raman scattering","author":[{"full_name":"Hempel, F.","last_name":"Hempel","first_name":"F."},{"id":"22501","full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing","first_name":"Michael"},{"first_name":"F.","last_name":"Vernuccio","full_name":"Vernuccio, F."},{"full_name":"Spychala, K. J.","last_name":"Spychala","first_name":"K. J."},{"first_name":"R.","last_name":"Buschbeck","full_name":"Buschbeck, R."},{"first_name":"G.","last_name":"Cerullo","full_name":"Cerullo, G."},{"first_name":"D.","last_name":"Polli","full_name":"Polli, D."},{"first_name":"L. M.","last_name":"Eng","full_name":"Eng, L. M."}],"publication_identifier":{"issn":["2469-9950","2469-9969"]},"publication_status":"published","date_updated":"2025-12-02T19:23:55Z","article_type":"original","intvolume":" 112","article_number":"224106","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2506.05519"}],"language":[{"iso":"eng"}],"doi":"10.1103/1ctr-csjy","issue":"22","publication":"Physical Review B","abstract":[{"lang":"eng","text":"Coherent Raman scattering techniques as coherent anti-Stokes Raman scattering (CARS), offer significant advantages in terms of pixel dwell times and speed as compared to spontaneous Raman scattering for investigations of crystalline materials. However, the spectral information in CARS is often hampered by the presence of a nonresonant contribution to the scattering process that shifts and distorts the Raman peaks. In this work, we apply a method to obtain nonresonant background-free spectra based on time-delayed, broadband CARS (TD-BCARS) using an intrapulse excitation scheme. In particular, this method can measure the phononic dephasing times across the full phonon spectrum at once. We test the methodology on amorphous SiO2 (glass), which is used to characterize the setup-specific and material-independent response times, and then apply TD-BCARS to the analysis of single crystals of diamond and ferroelectrics of potassium titanyl phosphate (KTP) and potassium titanyl arsenate (KTA). For diamond, we determine a dephasing time of 𝜏=7.81 ps for the single 𝑠𝑝3 peak."}],"date_created":"2025-12-02T19:21:33Z","type":"journal_article","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"status":"public","publisher":"American Physical Society (APS)","_id":"62749","user_id":"22501","volume":112,"citation":{"mla":"Hempel, F., et al. “Phonon Dephasing Times Determined with Time-Delayed Broadband Coherent Anti-Stokes Raman Scattering.” Physical Review B, vol. 112, no. 22, 224106, American Physical Society (APS), 2025, doi:10.1103/1ctr-csjy.","ama":"Hempel F, Rüsing M, Vernuccio F, et al. Phonon dephasing times determined with time-delayed broadband coherent anti-Stokes Raman scattering. Physical Review B. 2025;112(22). doi:10.1103/1ctr-csjy","bibtex":"@article{Hempel_Rüsing_Vernuccio_Spychala_Buschbeck_Cerullo_Polli_Eng_2025, title={Phonon dephasing times determined with time-delayed broadband coherent anti-Stokes Raman scattering}, volume={112}, DOI={10.1103/1ctr-csjy}, number={22224106}, journal={Physical Review B}, publisher={American Physical Society (APS)}, author={Hempel, F. and Rüsing, Michael and Vernuccio, F. and Spychala, K. J. and Buschbeck, R. and Cerullo, G. and Polli, D. and Eng, L. M.}, year={2025} }","apa":"Hempel, F., Rüsing, M., Vernuccio, F., Spychala, K. J., Buschbeck, R., Cerullo, G., Polli, D., & Eng, L. M. (2025). Phonon dephasing times determined with time-delayed broadband coherent anti-Stokes Raman scattering. Physical Review B, 112(22), Article 224106. https://doi.org/10.1103/1ctr-csjy","ieee":"F. Hempel et al., “Phonon dephasing times determined with time-delayed broadband coherent anti-Stokes Raman scattering,” Physical Review B, vol. 112, no. 22, Art. no. 224106, 2025, doi: 10.1103/1ctr-csjy.","chicago":"Hempel, F., Michael Rüsing, F. Vernuccio, K. J. Spychala, R. Buschbeck, G. Cerullo, D. Polli, and L. M. Eng. “Phonon Dephasing Times Determined with Time-Delayed Broadband Coherent Anti-Stokes Raman Scattering.” Physical Review B 112, no. 22 (2025). https://doi.org/10.1103/1ctr-csjy.","short":"F. Hempel, M. Rüsing, F. Vernuccio, K.J. Spychala, R. Buschbeck, G. Cerullo, D. Polli, L.M. Eng, Physical Review B 112 (2025)."},"quality_controlled":"1","external_id":{"arxiv":["2506.05519"]},"oa":"1"},{"citation":{"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,” Physical Review Research, vol. 7, no. 3, Art. no. 033122, 2025, doi: 10.1103/zp72-7qwl.","apa":"Kopylov, D. A., Stefszky, M., Meier, T., Silberhorn, C., & Sharapova, P. R. (2025). Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation. Physical Review Research, 7(3), Article 033122. https://doi.org/10.1103/zp72-7qwl","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.” Physical Review Research 7, no. 3 (2025). https://doi.org/10.1103/zp72-7qwl.","short":"D.A. Kopylov, M. Stefszky, T. Meier, C. Silberhorn, P.R. Sharapova, Physical Review Research 7 (2025).","mla":"Kopylov, Denis A., et al. “Spectral and Temporal Properties of Type-II Parametric down-Conversion: The Impact of Losses during State Generation.” Physical Review Research, vol. 7, no. 3, 033122, American Physical Society (APS), 2025, doi:10.1103/zp72-7qwl.","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={10.1103/zp72-7qwl}, 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} }","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. Physical Review Research. 2025;7(3). doi:10.1103/zp72-7qwl"},"project":[{"_id":"266","name":"PhoQC: Photonisches Quantencomputing"},{"_id":"53","name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"},{"_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"}],"_id":"62911","publisher":"American Physical Society (APS)","volume":7,"user_id":"16199","status":"public","date_created":"2025-12-05T09:33:36Z","department":[{"_id":"15"},{"_id":"569"},{"_id":"170"},{"_id":"293"},{"_id":"288"},{"_id":"230"},{"_id":"623"},{"_id":"429"},{"_id":"35"}],"type":"journal_article","issue":"3","publication":"Physical Review Research","abstract":[{"lang":"eng","text":"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."}],"language":[{"iso":"eng"}],"article_number":"033122","doi":"10.1103/zp72-7qwl","publication_identifier":{"issn":["2643-1564"]},"author":[{"full_name":"Kopylov, Denis A.","first_name":"Denis A.","last_name":"Kopylov"},{"id":"42777","full_name":"Stefszky, Michael","first_name":"Michael","last_name":"Stefszky"},{"id":"344","full_name":"Meier, Torsten","orcid":"0000-0001-8864-2072","last_name":"Meier","first_name":"Torsten"},{"id":"26263","last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine"},{"full_name":"Sharapova, Polina R.","last_name":"Sharapova","first_name":"Polina R.","id":"60286"}],"year":"2025","title":"Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation","intvolume":" 7","date_updated":"2025-12-05T09:55:22Z","publication_status":"published"},{"oa":"1","project":[{"name":"TRR 142; TP C07: Hohlraum-verstärkte Parametrische Fluoreszenz mit zeitlicher Filterung unter Verwendung integrierter supraleitender Detektoren","_id":"171"}],"citation":{"mla":"Lange, Nina Amelie, et al. “Widely Non-Degenerate Nonlinear Frequency Conversion in Cryogenic Titanium in-Diffused Lithium Niobate Waveguides.” Optics Express, vol. 33, no. 24, 50451, Optica Publishing Group, 2025, doi:10.1364/oe.578108.","bibtex":"@article{Lange_Lengeling_Mues_Quiring_Ridder_Eigner_Herrmann_Silberhorn_Bartley_2025, title={Widely non-degenerate nonlinear frequency conversion in cryogenic titanium in-diffused lithium niobate waveguides}, volume={33}, DOI={10.1364/oe.578108}, number={2450451}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Lange, Nina Amelie and Lengeling, Sebastian and Mues, Philipp and Quiring, Viktor and Ridder, Werner and Eigner, Christof and Herrmann, Harald and Silberhorn, Christine and Bartley, Tim}, year={2025} }","ama":"Lange NA, Lengeling S, Mues P, et al. Widely non-degenerate nonlinear frequency conversion in cryogenic titanium in-diffused lithium niobate waveguides. Optics Express. 2025;33(24). doi:10.1364/oe.578108","ieee":"N. A. Lange et al., “Widely non-degenerate nonlinear frequency conversion in cryogenic titanium in-diffused lithium niobate waveguides,” Optics Express, vol. 33, no. 24, Art. no. 50451, 2025, doi: 10.1364/oe.578108.","apa":"Lange, N. A., Lengeling, S., Mues, P., Quiring, V., Ridder, W., Eigner, C., Herrmann, H., Silberhorn, C., & Bartley, T. (2025). Widely non-degenerate nonlinear frequency conversion in cryogenic titanium in-diffused lithium niobate waveguides. Optics Express, 33(24), Article 50451. https://doi.org/10.1364/oe.578108","chicago":"Lange, Nina Amelie, Sebastian Lengeling, Philipp Mues, Viktor Quiring, Werner Ridder, Christof Eigner, Harald Herrmann, Christine Silberhorn, and Tim Bartley. “Widely Non-Degenerate Nonlinear Frequency Conversion in Cryogenic Titanium in-Diffused Lithium Niobate Waveguides.” Optics Express 33, no. 24 (2025). https://doi.org/10.1364/oe.578108.","short":"N.A. Lange, S. Lengeling, P. Mues, V. Quiring, W. Ridder, C. Eigner, H. Herrmann, C. Silberhorn, T. Bartley, Optics Express 33 (2025)."},"user_id":"49683","volume":33,"_id":"62269","publisher":"Optica Publishing Group","status":"public","type":"journal_article","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"date_created":"2025-11-20T10:35:35Z","abstract":[{"lang":"eng","text":"The titanium in-diffused lithium niobate waveguide platform is well-established for reliable prototyping and packaging of many quantum photonic components at room temperature. Nevertheless, compatibility with certain quantum light sources and superconducting detectors requires operation under cryogenic conditions. We characterize alterations in phase-matching and mode guiding of a non-degenerate spontaneous parametric down-conversion process emitting around 1556 nm and 950 nm, under cryogenic conditions. Despite the effects of pyroelectricity and photorefraction, the spectral properties match our theoretical model. Nevertheless, these effects cause small but significant variations within and between cooling cycles. These measurements provide a first benchmark against which other nonlinear photonic integration platforms, such as thin-film lithium niobate, can be compared."}],"issue":"24","publication":"Optics Express","doi":"10.1364/oe.578108","main_file_link":[{"open_access":"1"}],"article_number":"50451","language":[{"iso":"eng"}],"date_updated":"2025-12-12T12:13:45Z","publication_status":"published","intvolume":" 33","article_type":"original","year":"2025","title":"Widely non-degenerate nonlinear frequency conversion in cryogenic titanium in-diffused lithium niobate waveguides","author":[{"first_name":"Nina Amelie","orcid":"0000-0001-6624-7098","last_name":"Lange","full_name":"Lange, Nina Amelie","id":"56843"},{"id":"44373","last_name":"Lengeling","first_name":"Sebastian","full_name":"Lengeling, Sebastian"},{"full_name":"Mues, Philipp","orcid":"0000-0003-0643-7636","first_name":"Philipp","last_name":"Mues","id":"49772"},{"first_name":"Viktor","last_name":"Quiring","full_name":"Quiring, Viktor"},{"last_name":"Ridder","first_name":"Werner","full_name":"Ridder, Werner","id":"63574"},{"id":"13244","last_name":"Eigner","first_name":"Christof","orcid":"https://orcid.org/0000-0002-5693-3083","full_name":"Eigner, Christof"},{"id":"216","full_name":"Herrmann, Harald","first_name":"Harald","last_name":"Herrmann"},{"full_name":"Silberhorn, Christine","first_name":"Christine","last_name":"Silberhorn","id":"26263"},{"id":"49683","first_name":"Tim","last_name":"Bartley","full_name":"Bartley, Tim"}],"publication_identifier":{"issn":["1094-4087"]}},{"main_file_link":[{"open_access":"1"}],"_id":"60466","language":[{"iso":"eng"}],"user_id":"56843","doi":"10.1088/1367-2630/ade46c","year":"2025","status":"public","title":"Harnessing temporal dispersion for integrated pump filtering in spontaneous heralded single-photon generation processes","author":[{"id":"44807","first_name":"Julian","last_name":"Brockmeier","full_name":"Brockmeier, Julian"},{"id":"55629","full_name":"Schapeler, Timon","first_name":"Timon","orcid":"0000-0001-7652-1716","last_name":"Schapeler"},{"orcid":"0000-0001-6624-7098","first_name":"Nina Amelie","last_name":"Lange","full_name":"Lange, Nina Amelie","id":"56843"},{"first_name":"Jan Philipp","last_name":"Höpker","full_name":"Höpker, Jan Philipp","id":"33913"},{"id":"216","full_name":"Herrmann, Harald","first_name":"Harald","last_name":"Herrmann"},{"last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263"},{"last_name":"Bartley","first_name":"Tim","full_name":"Bartley, Tim","id":"49683"}],"date_updated":"2025-12-15T09:21:29Z","date_created":"2025-06-30T08:58:37Z","type":"journal_article","department":[{"_id":"15"},{"_id":"623"}],"oa":"1","publication":"New Journal of Physics","citation":{"short":"J. Brockmeier, T. Schapeler, N.A. Lange, J.P. Höpker, H. Herrmann, C. Silberhorn, T. Bartley, New Journal of Physics (2025).","chicago":"Brockmeier, Julian, Timon Schapeler, Nina Amelie Lange, Jan Philipp Höpker, Harald Herrmann, Christine Silberhorn, and Tim Bartley. “Harnessing Temporal Dispersion for Integrated Pump Filtering in Spontaneous Heralded Single-Photon Generation Processes.” New Journal of Physics, 2025. https://doi.org/10.1088/1367-2630/ade46c.","apa":"Brockmeier, J., Schapeler, T., Lange, N. A., Höpker, J. P., Herrmann, H., Silberhorn, C., & Bartley, T. (2025). Harnessing temporal dispersion for integrated pump filtering in spontaneous heralded single-photon generation processes. New Journal of Physics. https://doi.org/10.1088/1367-2630/ade46c","ieee":"J. Brockmeier et al., “Harnessing temporal dispersion for integrated pump filtering in spontaneous heralded single-photon generation processes,” New Journal of Physics, 2025, doi: 10.1088/1367-2630/ade46c.","ama":"Brockmeier J, Schapeler T, Lange NA, et al. Harnessing temporal dispersion for integrated pump filtering in spontaneous heralded single-photon generation processes. New Journal of Physics. Published online 2025. doi:10.1088/1367-2630/ade46c","bibtex":"@article{Brockmeier_Schapeler_Lange_Höpker_Herrmann_Silberhorn_Bartley_2025, title={Harnessing temporal dispersion for integrated pump filtering in spontaneous heralded single-photon generation processes}, DOI={10.1088/1367-2630/ade46c}, journal={New Journal of Physics}, author={Brockmeier, Julian and Schapeler, Timon and Lange, Nina Amelie and Höpker, Jan Philipp and Herrmann, Harald and Silberhorn, Christine and Bartley, Tim}, year={2025} }","mla":"Brockmeier, Julian, et al. “Harnessing Temporal Dispersion for Integrated Pump Filtering in Spontaneous Heralded Single-Photon Generation Processes.” New Journal of Physics, 2025, doi:10.1088/1367-2630/ade46c."},"project":[{"_id":"171","name":"TRR 142; TP C07: Hohlraum-verstärkte Parametrische Fluoreszenz mit zeitlicher Filterung unter Verwendung integrierter supraleitender Detektoren"}]},{"user_id":"69553","volume":193,"_id":"63192","publisher":"Elsevier BV","status":"public","oa":"1","quality_controlled":"1","citation":{"ama":"Kirsch M, Kießler C, Lengeling S, et al. Photorefraction and in-situ optical cleaning in various types of LiNbO3 waveguides. Optics & Laser Technology. 2025;193. doi:10.1016/j.optlastec.2025.114260","bibtex":"@article{Kirsch_Kießler_Lengeling_Stefszky_Eigner_Herrmann_Silberhorn_2025, title={Photorefraction and in-situ optical cleaning in various types of LiNbO3 waveguides}, volume={193}, DOI={10.1016/j.optlastec.2025.114260}, number={114260}, journal={Optics & Laser Technology}, publisher={Elsevier BV}, author={Kirsch, Michelle and Kießler, Christian and Lengeling, Sebastian and Stefszky, Michael and Eigner, Christof and Herrmann, Harald and Silberhorn, Christine}, year={2025} }","mla":"Kirsch, Michelle, et al. “Photorefraction and In-Situ Optical Cleaning in Various Types of LiNbO3 Waveguides.” Optics & Laser Technology, vol. 193, 114260, Elsevier BV, 2025, doi:10.1016/j.optlastec.2025.114260.","short":"M. Kirsch, C. Kießler, S. Lengeling, M. Stefszky, C. Eigner, H. Herrmann, C. Silberhorn, Optics & Laser Technology 193 (2025).","chicago":"Kirsch, Michelle, Christian Kießler, Sebastian Lengeling, Michael Stefszky, Christof Eigner, Harald Herrmann, and Christine Silberhorn. “Photorefraction and In-Situ Optical Cleaning in Various Types of LiNbO3 Waveguides.” Optics & Laser Technology 193 (2025). https://doi.org/10.1016/j.optlastec.2025.114260.","apa":"Kirsch, M., Kießler, C., Lengeling, S., Stefszky, M., Eigner, C., Herrmann, H., & Silberhorn, C. (2025). Photorefraction and in-situ optical cleaning in various types of LiNbO3 waveguides. Optics & Laser Technology, 193, Article 114260. https://doi.org/10.1016/j.optlastec.2025.114260","ieee":"M. Kirsch et al., “Photorefraction and in-situ optical cleaning in various types of LiNbO3 waveguides,” Optics & Laser Technology, vol. 193, Art. no. 114260, 2025, doi: 10.1016/j.optlastec.2025.114260."},"doi":"10.1016/j.optlastec.2025.114260","main_file_link":[{"url":"https://www.sciencedirect.com/science/article/pii/S0030399225018511?via%3Dihub","open_access":"1"}],"article_number":"114260","language":[{"iso":"eng"}],"date_updated":"2025-12-18T08:27:13Z","publication_status":"published","intvolume":" 193","article_type":"original","year":"2025","title":"Photorefraction and in-situ optical cleaning in various types of LiNbO3 waveguides","author":[{"first_name":"Michelle","last_name":"Kirsch","full_name":"Kirsch, Michelle","id":"69553"},{"id":"44252","full_name":"Kießler, Christian","first_name":"Christian","last_name":"Kießler"},{"full_name":"Lengeling, Sebastian","first_name":"Sebastian","last_name":"Lengeling","id":"44373"},{"id":"42777","last_name":"Stefszky","first_name":"Michael","full_name":"Stefszky, Michael"},{"last_name":"Eigner","first_name":"Christof","orcid":"https://orcid.org/0000-0002-5693-3083","full_name":"Eigner, Christof","id":"13244"},{"last_name":"Herrmann","first_name":"Harald","full_name":"Herrmann, Harald","id":"216"},{"full_name":"Silberhorn, Christine","first_name":"Christine","last_name":"Silberhorn","id":"26263"}],"publication_identifier":{"issn":["0030-3992"]},"type":"journal_article","department":[{"_id":"288"},{"_id":"623"},{"_id":"15"}],"date_created":"2025-12-18T08:17:57Z","abstract":[{"lang":"eng","text":"Lithium niobate (LiNbO3) is a widely used material with several desirable physical properties, such as high second-order nonlinear optical and strong electro-optical effects. Thus LiNbO3 is used for various applications such as electro-optic modulation or nonlinear frequency conversion and mixing. But LiNbO3 also exhibits a strong photorefractive effect, which limits the intensity of the optical fields involved. Various approaches to reduce the photorefractive effect have been investigated, such as increasing the temperature, doping the crystal or using different waveguide designs in LiNbO3. Here, we present an analysis of the approach to increase the photorefractive damage threshold by using different waveguide designs. Contrary to previous claims and investigations, our SHG measurements revealed no significant difference in resistance to photorefractive damage when comparing conventional Ti-doped channel waveguides and Ti-doped diced ridge waveguides in LiNbO3. Furthermore, we have investigated the effect of photorefractive cleaning and curing using a light field at 532 nm. Here, we observe a reduction in the photorefractive effect at room temperature during and after SHG measurements, which is an easy alternative to conventional approaches."}],"publication":"Optics & Laser Technology"}]