[{"date_created":"2022-06-22T09:56:43Z","file":[{"file_name":"2103.02968.pdf","access_level":"open_access","file_size":978990,"relation":"main_file","date_updated":"2022-06-22T09:56:39Z","file_id":"32100","content_type":"application/pdf","creator":"weich","date_created":"2022-06-22T09:56:39Z"}],"department":[{"_id":"10"},{"_id":"623"},{"_id":"548"}],"type":"journal_article","issue":"1","publication":"Journal of Functional Analysis","language":[{"iso":"eng"}],"doi":" https://doi.org/10.1016/j.jfa.2024.110684","author":[{"full_name":"Weich, Tobias","last_name":"Weich","first_name":"Tobias","orcid":"0000-0002-9648-6919","id":"49178"},{"first_name":"Julia","last_name":"Budde","full_name":"Budde, Julia"}],"year":"2025","title":"Wave Front Sets of Nilpotent Lie Group Representations","intvolume":" 288","date_updated":"2024-09-25T08:18:44Z","oa":"1","citation":{"mla":"Weich, Tobias, and Julia Budde. “Wave Front Sets of Nilpotent Lie Group Representations.” Journal of Functional Analysis, vol. 288, no. 1, 2025, doi: https://doi.org/10.1016/j.jfa.2024.110684.","bibtex":"@article{Weich_Budde_2025, title={Wave Front Sets of Nilpotent Lie Group Representations}, volume={288}, DOI={ https://doi.org/10.1016/j.jfa.2024.110684}, number={1}, journal={Journal of Functional Analysis}, author={Weich, Tobias and Budde, Julia}, year={2025} }","ama":"Weich T, Budde J. Wave Front Sets of Nilpotent Lie Group Representations. Journal of Functional Analysis. 2025;288(1). doi: https://doi.org/10.1016/j.jfa.2024.110684","ieee":"T. Weich and J. Budde, “Wave Front Sets of Nilpotent Lie Group Representations,” Journal of Functional Analysis, vol. 288, no. 1, 2025, doi: https://doi.org/10.1016/j.jfa.2024.110684.","apa":"Weich, T., & Budde, J. (2025). Wave Front Sets of Nilpotent Lie Group Representations. Journal of Functional Analysis, 288(1). https://doi.org/ https://doi.org/10.1016/j.jfa.2024.110684","chicago":"Weich, Tobias, and Julia Budde. “Wave Front Sets of Nilpotent Lie Group Representations.” Journal of Functional Analysis 288, no. 1 (2025). https://doi.org/ https://doi.org/10.1016/j.jfa.2024.110684.","short":"T. Weich, J. Budde, Journal of Functional Analysis 288 (2025)."},"file_date_updated":"2022-06-22T09:56:39Z","project":[{"name":"TRR 358 - B02: TRR 358 - Spektraltheorie in höherem Rang und unendlichem Volumen (Teilprojekt B02)","_id":"356","grant_number":"491392403"},{"_id":"355","grant_number":"422642921","name":"Mikrolokale Methoden für hyperbolische Dynamiken"}],"_id":"32099","volume":288,"ddc":["510"],"user_id":"49178","status":"public","has_accepted_license":"1"},{"citation":{"ama":"Brauckmann M, Narvaez Castaneda E, Siebert D, Brecht B, Förstner J, Zentgraf T. Enhancement Of Light-matter Interaction In Topological Waveguides And Resonators. In: Proceedings of The 15th International Conference on Metamaterials, Photonic Crystals and Plasmonics. ; 2025.","bibtex":"@inproceedings{Brauckmann_Narvaez Castaneda_Siebert_Brecht_Förstner_Zentgraf_2025, title={Enhancement Of Light-matter Interaction In Topological Waveguides And Resonators}, booktitle={Proceedings of The 15th International Conference on Metamaterials, Photonic Crystals and Plasmonics}, author={Brauckmann, Michael and Narvaez Castaneda, Emmanuel and Siebert, Dustin and Brecht, Benjamin and Förstner, Jens and Zentgraf, Thomas}, year={2025} }","mla":"Brauckmann, Michael, et al. “Enhancement Of Light-Matter Interaction In Topological Waveguides And Resonators.” Proceedings of The 15th International Conference on Metamaterials, Photonic Crystals and Plasmonics, 2025.","short":"M. Brauckmann, E. Narvaez Castaneda, D. Siebert, B. Brecht, J. Förstner, T. Zentgraf, in: Proceedings of The 15th International Conference on Metamaterials, Photonic Crystals and Plasmonics, 2025.","chicago":"Brauckmann, Michael, Emmanuel Narvaez Castaneda, Dustin Siebert, Benjamin Brecht, Jens Förstner, and Thomas Zentgraf. “Enhancement Of Light-Matter Interaction In Topological Waveguides And Resonators.” In Proceedings of The 15th International Conference on Metamaterials, Photonic Crystals and Plasmonics, 2025.","apa":"Brauckmann, M., Narvaez Castaneda, E., Siebert, D., Brecht, B., Förstner, J., & Zentgraf, T. (2025). Enhancement Of Light-matter Interaction In Topological Waveguides And Resonators. Proceedings of The 15th International Conference on Metamaterials, Photonic Crystals and Plasmonics. META 2025 - The 15th International Conference on Metamaterials, Photonic Crystals and Plasmonics, Malaga, Spain.","ieee":"M. Brauckmann, E. Narvaez Castaneda, D. Siebert, B. Brecht, J. Förstner, and T. Zentgraf, “Enhancement Of Light-matter Interaction In Topological Waveguides And Resonators,” presented at the META 2025 - The 15th International Conference on Metamaterials, Photonic Crystals and Plasmonics, Malaga, Spain, 2025."},"publication":"Proceedings of The 15th International Conference on Metamaterials, Photonic Crystals and Plasmonics","project":[{"name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53","grant_number":"231447078"},{"_id":"54","name":"TRR 142 - A: TRR 142 - Project Area A"},{"grant_number":"231447078","_id":"164","name":"TRR 142 - A09: TRR 142 - Erzeugung von Drei-Photonen-Zuständen mit On-Chip Pumplichtunterdrückung in topologischen Wellenleitern (A09*)"}],"date_created":"2025-05-23T06:10:53Z","department":[{"_id":"15"},{"_id":"230"},{"_id":"289"},{"_id":"623"}],"type":"conference","author":[{"full_name":"Brauckmann, Michael","last_name":"Brauckmann","first_name":"Michael"},{"full_name":"Narvaez Castaneda, Emmanuel","last_name":"Narvaez Castaneda","first_name":"Emmanuel"},{"last_name":"Siebert","first_name":"Dustin","full_name":"Siebert, Dustin"},{"full_name":"Brecht, Benjamin","first_name":"Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 ","id":"27150"},{"id":"158","orcid":"0000-0001-7059-9862","last_name":"Förstner","first_name":"Jens","full_name":"Förstner, Jens"},{"id":"30525","orcid":"0000-0002-8662-1101","first_name":"Thomas","last_name":"Zentgraf","full_name":"Zentgraf, Thomas"}],"conference":{"name":"META 2025 - The 15th International Conference on Metamaterials, Photonic Crystals and Plasmonics","start_date":"2025-07-22","location":"Malaga, Spain","end_date":"2025-07-25"},"status":"public","title":"Enhancement Of Light-matter Interaction In Topological Waveguides And Resonators","year":"2025","date_updated":"2025-05-23T06:11:20Z","_id":"60022","language":[{"iso":"eng"}],"user_id":"30525"},{"abstract":[{"lang":"eng","text":"In this proceeding we consider a translation invariant Nelson type model in\r\ntwo spatial dimensions modeling a scalar relativistic particle in interaction\r\nwith a massive radiation field. As is well-known, the corresponding Hamiltonian\r\ncan be defined with the help of an energy renormalization. First, we review a\r\nFeynman-Kac formula for the semigroup generated by this Hamiltonian proven by\r\nthe authors in a recent preprint (where several matter particles and exterior\r\npotentials are treated as well). After that, we employ a few technical key\r\nrelations and estimates obtained in our preprint to present an otherwise\r\nself-contained derivation of new Feynman-Kac formulas for the fiber\r\nHamiltonians attached to fixed total momenta of the translation invariant\r\nsystem. We conclude by inferring an alternative derivation of the Feynman-Kac\r\nformula for the full translation invariant Hamiltonian."}],"issue":"3","publication":"Proceedings of the 2023 RIMS Workshop 'Mathematical Aspects of Quantum Fields and Related Topics'","type":"conference","department":[{"_id":"799"},{"_id":"623"}],"date_created":"2023-10-02T06:21:37Z","date_updated":"2026-01-16T08:55:19Z","intvolume":" 2310","title":"Feynman-Kac formula for fiber Hamiltonians in the relativistic Nelson model in two spatial dimensions","year":"2025","author":[{"full_name":"Hinrichs, Benjamin","first_name":"Benjamin","last_name":"Hinrichs","orcid":"0000-0001-9074-1205","id":"99427"},{"full_name":"Matte, Oliver","last_name":"Matte","first_name":"Oliver"}],"main_file_link":[{"url":"https://www.kurims.kyoto-u.ac.jp/~kyodo/kokyuroku/contents/2310.html"}],"language":[{"iso":"eng"}],"series_title":"RIMS Kôkyûroku","project":[{"name":"PhoQC: PhoQC: Photonisches Quantencomputing","_id":"266"}],"citation":{"mla":"Hinrichs, Benjamin, and Oliver Matte. “Feynman-Kac Formula for Fiber Hamiltonians in the Relativistic Nelson Model in Two Spatial Dimensions.” Proceedings of the 2023 RIMS Workshop “Mathematical Aspects of Quantum Fields and Related Topics,” edited by Fumio Hiroshima, vol. 2310, no. 3, 2025.","bibtex":"@inproceedings{Hinrichs_Matte_2025, series={RIMS Kôkyûroku}, title={Feynman-Kac formula for fiber Hamiltonians in the relativistic Nelson model in two spatial dimensions}, volume={2310}, number={3}, booktitle={Proceedings of the 2023 RIMS Workshop “Mathematical Aspects of Quantum Fields and Related Topics”}, author={Hinrichs, Benjamin and Matte, Oliver}, editor={Hiroshima, Fumio}, year={2025}, collection={RIMS Kôkyûroku} }","ama":"Hinrichs B, Matte O. Feynman-Kac formula for fiber Hamiltonians in the relativistic Nelson model in two spatial dimensions. In: Hiroshima F, ed. Proceedings of the 2023 RIMS Workshop “Mathematical Aspects of Quantum Fields and Related Topics.” Vol 2310. RIMS Kôkyûroku. ; 2025.","ieee":"B. Hinrichs and O. Matte, “Feynman-Kac formula for fiber Hamiltonians in the relativistic Nelson model in two spatial dimensions,” in Proceedings of the 2023 RIMS Workshop “Mathematical Aspects of Quantum Fields and Related Topics,” 2025, vol. 2310, no. 3.","apa":"Hinrichs, B., & Matte, O. (2025). Feynman-Kac formula for fiber Hamiltonians in the relativistic Nelson model in two spatial dimensions. In F. Hiroshima (Ed.), Proceedings of the 2023 RIMS Workshop “Mathematical Aspects of Quantum Fields and Related Topics” (Vol. 2310, Issue 3).","chicago":"Hinrichs, Benjamin, and Oliver Matte. “Feynman-Kac Formula for Fiber Hamiltonians in the Relativistic Nelson Model in Two Spatial Dimensions.” In Proceedings of the 2023 RIMS Workshop “Mathematical Aspects of Quantum Fields and Related Topics,” edited by Fumio Hiroshima, Vol. 2310. RIMS Kôkyûroku, 2025.","short":"B. Hinrichs, O. Matte, in: F. Hiroshima (Ed.), Proceedings of the 2023 RIMS Workshop “Mathematical Aspects of Quantum Fields and Related Topics,” 2025."},"external_id":{"arxiv":["2309.09005"]},"status":"public","user_id":"99427","volume":2310,"editor":[{"first_name":"Fumio","last_name":"Hiroshima","full_name":"Hiroshima, Fumio"}],"_id":"47534"},{"type":"preprint","department":[{"_id":"34"},{"_id":"64"},{"_id":"623"}],"external_id":{"arxiv":["2509.10183"]},"date_created":"2025-12-15T15:34:08Z","abstract":[{"text":"We construct good GKP (Gottesman-Kitaev-Preskill) codes (in the sense of Conrad, Eisert and Seifert proposed) from standard short integer solution lattices (SIS) as well as from ring SIS and module SIS lattices, R-SIS and M-SIS lattices, respectively. These lattice are crucial for lattice-based cryptography. Our construction yields GKP codes with distance $\\sqrt{n/πe}$. This compares favorably with the NTRU-based construction by Conrad et al. that achieves distance $Ω(\\sqrt{n/q}),$ with $n\\le q^2/0.28$. Unlike their codes, our codes do not have secret keys that can be used to speed-up the decoding. However, we present a simple decoding algorithm that, for many parameter choices, experimentally yields decoding results similar to the ones for NTRU-based codes. Using the R-SIS and M-SIS construction, our simple decoding algorithm runs in nearly linear time. Following Conrad, Eisert and Seifert's work, our construction of GKP codes follows directly from an explicit, randomized construction of symplectic lattices with (up to constants $\\approx 1$) minimal distance $(1/σ_{2n})^{1/2n}\\approx \\sqrt{\\frac{n}{πe}}$, where $σ_{2n}$ is the volume of the 2n-dimensional unit ball. Before this result, Buser and Sarnak gave a non-constructive proof for the existence of such symplectic lattices.","lang":"eng"}],"project":[{"_id":"191","name":"PhoQuant: Photonische Quantencomputer - Quantencomputing Testplattform"}],"publication":"arXiv:2509.10183","citation":{"mla":"Blömer, Johannes, et al. “Symplectic Lattices and GKP Codes -- Simple Randomized Constructions from Cryptographic Lattices.” ArXiv:2509.10183, 2025.","ama":"Blömer J, Xiao Y, Raissi Z, Soltan S. Symplectic Lattices and GKP Codes -- Simple Randomized Constructions from Cryptographic Lattices. arXiv:250910183. Published online 2025.","bibtex":"@article{Blömer_Xiao_Raissi_Soltan_2025, title={Symplectic Lattices and GKP Codes -- Simple Randomized Constructions from Cryptographic Lattices}, journal={arXiv:2509.10183}, author={Blömer, Johannes and Xiao, Yinzi and Raissi, Zahra and Soltan, Stanislaw}, year={2025} }","apa":"Blömer, J., Xiao, Y., Raissi, Z., & Soltan, S. (2025). Symplectic Lattices and GKP Codes -- Simple Randomized Constructions from Cryptographic Lattices. In arXiv:2509.10183.","ieee":"J. Blömer, Y. Xiao, Z. Raissi, and S. Soltan, “Symplectic Lattices and GKP Codes -- Simple Randomized Constructions from Cryptographic Lattices,” arXiv:2509.10183. 2025.","chicago":"Blömer, Johannes, Yinzi Xiao, Zahra Raissi, and Stanislaw Soltan. “Symplectic Lattices and GKP Codes -- Simple Randomized Constructions from Cryptographic Lattices.” ArXiv:2509.10183, 2025.","short":"J. Blömer, Y. Xiao, Z. Raissi, S. Soltan, ArXiv:2509.10183 (2025)."},"user_id":"41047","_id":"63107","language":[{"iso":"eng"}],"date_updated":"2026-01-23T09:59:34Z","year":"2025","title":"Symplectic Lattices and GKP Codes -- Simple Randomized Constructions from Cryptographic Lattices","status":"public","author":[{"last_name":"Blömer","first_name":"Johannes","full_name":"Blömer, Johannes"},{"last_name":"Xiao","first_name":"Yinzi","full_name":"Xiao, Yinzi"},{"full_name":"Raissi, Zahra","first_name":"Zahra","last_name":"Raissi"},{"first_name":"Stanislaw","last_name":"Soltan","full_name":"Soltan, Stanislaw"}]},{"publication_status":"published","date_updated":"2026-01-26T14:35:42Z","article_type":"original","intvolume":" 14","title":"Electro-optic frequency shift of single photons from a quantum dot","year":"2025","publication_identifier":{"issn":["2192-8614"]},"author":[{"full_name":"Kapoor, Sanjay","first_name":"Sanjay","last_name":"Kapoor"},{"last_name":"Rodek","first_name":"Aleksander","full_name":"Rodek, Aleksander"},{"full_name":"Mikołajczyk, Michał","first_name":"Michał","last_name":"Mikołajczyk"},{"full_name":"Szuniewicz, Jerzy","first_name":"Jerzy","last_name":"Szuniewicz"},{"id":"106751","last_name":"Sośnicki","orcid":"0000-0002-2465-4645","first_name":"Filip Maksymilian","full_name":"Sośnicki, Filip Maksymilian"},{"full_name":"Kazimierczuk, Tomasz","last_name":"Kazimierczuk","first_name":"Tomasz"},{"full_name":"Kossacki, Piotr","first_name":"Piotr","last_name":"Kossacki"},{"full_name":"Karpiński, Michał","last_name":"Karpiński","first_name":"Michał"}],"doi":"10.1515/nanoph-2024-0550","main_file_link":[{"url":"https://www.degruyterbrill.com/document/doi/10.1515/nanoph-2024-0550/html"}],"language":[{"iso":"eng"}],"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."}],"issue":"11","publication":"Nanophotonics","type":"journal_article","department":[{"_id":"623"},{"_id":"288"},{"_id":"15"}],"date_created":"2026-01-26T14:34:16Z","status":"public","user_id":"106751","volume":14,"page":"1775-1782","publisher":"Walter de Gruyter GmbH","_id":"63734","citation":{"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","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} }","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.","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.","short":"S. Kapoor, A. Rodek, M. Mikołajczyk, J. Szuniewicz, F.M. Sośnicki, T. Kazimierczuk, P. Kossacki, M. Karpiński, Nanophotonics 14 (2025) 1775–1782.","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","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."}},{"date_created":"2026-01-26T14:24:34Z","type":"journal_article","department":[{"_id":"623"},{"_id":"288"},{"_id":"15"}],"issue":"9","publication":"APL Photonics","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."}],"article_number":"096111","main_file_link":[{"url":"https://pubs.aip.org/aip/app/article/10/9/096111/3364187"}],"language":[{"iso":"eng"}],"doi":"10.1063/5.0270904","title":"Aberration-optimized electro-optic time lens model using a tunable aperture","year":"2025","author":[{"first_name":"Sanjay","last_name":"Kapoor","full_name":"Kapoor, Sanjay"},{"full_name":"Sośnicki, Filip Maksymilian","last_name":"Sośnicki","orcid":"0000-0002-2465-4645","first_name":"Filip Maksymilian","id":"106751"},{"last_name":"Karpiński","first_name":"Michał","full_name":"Karpiński, Michał"}],"publication_identifier":{"issn":["2378-0967"]},"publication_status":"published","date_updated":"2026-01-26T14:27:42Z","article_type":"original","intvolume":" 10","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"},"publisher":"AIP Publishing","_id":"63732","user_id":"106751","volume":10,"status":"public"},{"citation":{"mla":"Barkhausen, Franziska, et al. “Entanglement between Dependent Degrees of Freedom: Quasiparticle Correlations.” Physical Review A, vol. 111, no. 3, 032404, American Physical Society (APS), 2025, doi:10.1103/physreva.111.032404.","bibtex":"@article{Barkhausen_Ares Santos_Schumacher_Sperling_2025, title={Entanglement between dependent degrees of freedom: Quasiparticle correlations}, volume={111}, DOI={10.1103/physreva.111.032404}, number={3032404}, journal={Physical Review A}, publisher={American Physical Society (APS)}, author={Barkhausen, Franziska and Ares Santos, Laura and Schumacher, Stefan and Sperling, Jan}, year={2025} }","ama":"Barkhausen F, Ares Santos L, Schumacher S, Sperling J. Entanglement between dependent degrees of freedom: Quasiparticle correlations. Physical Review A. 2025;111(3). doi:10.1103/physreva.111.032404","ieee":"F. Barkhausen, L. Ares Santos, S. Schumacher, and J. Sperling, “Entanglement between dependent degrees of freedom: Quasiparticle correlations,” Physical Review A, vol. 111, no. 3, Art. no. 032404, 2025, doi: 10.1103/physreva.111.032404.","apa":"Barkhausen, F., Ares Santos, L., Schumacher, S., & Sperling, J. (2025). Entanglement between dependent degrees of freedom: Quasiparticle correlations. Physical Review A, 111(3), Article 032404. https://doi.org/10.1103/physreva.111.032404","chicago":"Barkhausen, Franziska, Laura Ares Santos, Stefan Schumacher, and Jan Sperling. “Entanglement between Dependent Degrees of Freedom: Quasiparticle Correlations.” Physical Review A 111, no. 3 (2025). https://doi.org/10.1103/physreva.111.032404.","short":"F. Barkhausen, L. Ares Santos, S. Schumacher, J. Sperling, Physical Review A 111 (2025)."},"project":[{"_id":"53","name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"},{"_id":"54","name":"TRR 142 - Project Area A"},{"name":"TRR 142 - Project Area C","_id":"56"},{"_id":"61","name":"TRR 142; TP A04: Nichtlineare Quantenprozesstomographie und Photonik mit Polaritonen in Mikrokavitäten"},{"name":"TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen Systemen: Eine theoretische Analyse","_id":"174"},{"name":"PhoQC: Photonisches Quantencomputing","_id":"266"}],"publisher":"American Physical Society (APS)","_id":"61245","user_id":"16199","volume":111,"status":"public","date_created":"2025-09-12T10:37:34Z","type":"journal_article","department":[{"_id":"15"},{"_id":"170"},{"_id":"297"},{"_id":"706"},{"_id":"35"},{"_id":"230"},{"_id":"623"},{"_id":"429"}],"publication":"Physical Review A","issue":"3","article_number":"032404","language":[{"iso":"eng"}],"doi":"10.1103/physreva.111.032404","title":"Entanglement between dependent degrees of freedom: Quasiparticle correlations","year":"2025","author":[{"id":"63631","last_name":"Barkhausen","first_name":"Franziska","full_name":"Barkhausen, Franziska"},{"full_name":"Ares Santos, Laura","last_name":"Ares Santos","first_name":"Laura"},{"full_name":"Schumacher, Stefan","last_name":"Schumacher","first_name":"Stefan","orcid":"0000-0003-4042-4951","id":"27271"},{"orcid":"0000-0002-5844-3205","first_name":"Jan","last_name":"Sperling","full_name":"Sperling, Jan","id":"75127"}],"publication_identifier":{"issn":["2469-9926","2469-9934"]},"date_updated":"2025-09-12T10:42:16Z","publication_status":"published","intvolume":" 111"},{"publication":"Solid State Ionics","abstract":[{"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.","lang":"eng"}],"date_created":"2025-09-17T16:18:18Z","type":"journal_article","department":[{"_id":"15"},{"_id":"288"},{"_id":"623"}],"title":"Demonstration of domain wall current in MgO-doped lithium niobate single crystals up to 400°C","year":"2025","publication_identifier":{"issn":["0167-2738"]},"author":[{"last_name":"Wulfmeier","first_name":"Hendrik","full_name":"Wulfmeier, Hendrik"},{"first_name":"Uliana","last_name":"Yakhnevych","full_name":"Yakhnevych, Uliana"},{"last_name":"Boekhoff","first_name":"Cornelius","full_name":"Boekhoff, 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."},{"first_name":"Jonas","last_name":"Paul","full_name":"Paul, Jonas"},{"last_name":"Ratzenberger","first_name":"Julius","full_name":"Ratzenberger, Julius"},{"first_name":"Elke","last_name":"Beyreuther","full_name":"Beyreuther, Elke"},{"full_name":"Gössel, Joshua","first_name":"Joshua","last_name":"Gössel"},{"full_name":"Kiseleva, Iuliia","last_name":"Kiseleva","first_name":"Iuliia"},{"full_name":"Rüsing, Michael","last_name":"Rüsing","first_name":"Michael","orcid":"0000-0003-4682-4577","id":"22501"},{"first_name":"Simone","last_name":"Sanna","full_name":"Sanna, Simone"},{"full_name":"Eng, Lukas M.","last_name":"Eng","first_name":"Lukas M."},{"full_name":"Fritze, Holger","last_name":"Fritze","first_name":"Holger"}],"publication_status":"published","date_updated":"2025-09-17T16:19:51Z","article_type":"original","intvolume":" 429","article_number":"116949","main_file_link":[{"url":"https://doi.org/10.1016/j.ssi.2025.116949","open_access":"1"}],"language":[{"iso":"eng"}],"doi":"10.1016/j.ssi.2025.116949","citation":{"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.","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","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.","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.","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} }","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"},"quality_controlled":"1","oa":"1","status":"public","publisher":"Elsevier BV","_id":"61338","user_id":"22501","volume":429},{"funded_apc":"1","_id":"61337","publisher":"AIP Publishing","volume":138,"user_id":"22501","status":"public","oa":"1","citation":{"mla":"Koppitz, Boris, et al. “Second Harmonic Generation Contrasts of Ferroelectric Domain Structures and Composition in Lithium Niobate–Tantalate Mixed Crystals.” Journal of Applied Physics, vol. 138, no. 3, 034101, AIP Publishing, 2025, doi:10.1063/5.0276183.","apa":"Koppitz, B., Saxena, T., Bernhardt, F., Ganschow, S., Sanna, S., Rüsing, M., & Eng, L. M. (2025). Second harmonic generation contrasts of ferroelectric domain structures and composition in lithium niobate–tantalate mixed crystals. Journal of Applied Physics, 138(3), Article 034101. https://doi.org/10.1063/5.0276183","ieee":"B. Koppitz et al., “Second harmonic generation contrasts of ferroelectric domain structures and composition in lithium niobate–tantalate mixed crystals,” Journal of Applied Physics, vol. 138, no. 3, Art. no. 034101, 2025, doi: 10.1063/5.0276183.","chicago":"Koppitz, Boris, Tanya Saxena, Felix Bernhardt, Steffen Ganschow, Simone Sanna, Michael Rüsing, and Lukas M. Eng. “Second Harmonic Generation Contrasts of Ferroelectric Domain Structures and Composition in Lithium Niobate–Tantalate Mixed Crystals.” Journal of Applied Physics 138, no. 3 (2025). https://doi.org/10.1063/5.0276183.","ama":"Koppitz B, Saxena T, Bernhardt F, et al. Second harmonic generation contrasts of ferroelectric domain structures and composition in lithium niobate–tantalate mixed crystals. Journal of Applied Physics. 2025;138(3). doi:10.1063/5.0276183","short":"B. Koppitz, T. Saxena, F. Bernhardt, S. Ganschow, S. Sanna, M. Rüsing, L.M. Eng, Journal of Applied Physics 138 (2025).","bibtex":"@article{Koppitz_Saxena_Bernhardt_Ganschow_Sanna_Rüsing_Eng_2025, title={Second harmonic generation contrasts of ferroelectric domain structures and composition in lithium niobate–tantalate mixed crystals}, volume={138}, DOI={10.1063/5.0276183}, number={3034101}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Koppitz, Boris and Saxena, Tanya and Bernhardt, Felix and Ganschow, Steffen and Sanna, Simone and Rüsing, Michael and Eng, Lukas M.}, year={2025} }"},"quality_controlled":"1","language":[{"iso":"eng"}],"article_number":"034101","main_file_link":[{"open_access":"1","url":"https://pubs.aip.org/aip/jap/article/138/3/034101/3352909"}],"doi":"10.1063/5.0276183","author":[{"full_name":"Koppitz, Boris","first_name":"Boris","last_name":"Koppitz"},{"first_name":"Tanya","last_name":"Saxena","full_name":"Saxena, Tanya"},{"full_name":"Bernhardt, Felix","last_name":"Bernhardt","first_name":"Felix"},{"first_name":"Steffen","last_name":"Ganschow","full_name":"Ganschow, Steffen"},{"full_name":"Sanna, Simone","first_name":"Simone","last_name":"Sanna"},{"first_name":"Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing","full_name":"Rüsing, Michael","id":"22501"},{"first_name":"Lukas M.","last_name":"Eng","full_name":"Eng, Lukas M."}],"publication_identifier":{"issn":["0021-8979","1089-7550"]},"title":"Second harmonic generation contrasts of ferroelectric domain structures and composition in lithium niobate–tantalate mixed crystals","year":"2025","intvolume":" 138","publication_status":"published","date_updated":"2025-09-17T16:18:02Z","date_created":"2025-09-17T16:16:04Z","department":[{"_id":"15"},{"_id":"623"}],"type":"journal_article","issue":"3","publication":"Journal of Applied Physics","abstract":[{"text":"Lithium niobate–tantalate mixed (LNT) crystals promise improved performance and new applications for optical, piezomechanical, or electrical devices when compared to the end composition compounds lithium niobate and lithium tantalate. The macroscopic properties of ferroelectrics highly depend on the structure of the underlying ferroelectric domains, which within mixed crystals can interact with the local changes in chemical compositions. In this work, we demonstrate how ferroelectric domain walls can unambiguously be identified and distinguished from local changes in composition by correlating piezoresponse force microscopy with second harmonic generation microscopy, using the Cherenkov contrast, reference crystal contrast, and negative phase mismatching contrast. We demonstrate how measuring the associated intensity change when approaching negative phase mismatching can be used to deduce the local tantalum concentration fast and over a large sample area. Based on these results, we study the natural domain structures that appear from Czochralski-grown, multi-domain LNT solid solution crystals. The developed results and methods serve as the central foundation to poling these mixed crystal systems and are key for their integration and applications.","lang":"eng"}]},{"status":"public","_id":"58519","publisher":"Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften","user_id":"16199","volume":9,"citation":{"short":"D.A. Kopylov, T. Meier, P.R. Sharapova, Quantum 9 (2025).","chicago":"Kopylov, Denis A., Torsten Meier, and Polina R. Sharapova. “Theory of Multimode Squeezed Light Generation in Lossy Media.” Quantum 9 (2025). https://doi.org/10.22331/q-2025-02-04-1621.","apa":"Kopylov, D. A., Meier, T., & Sharapova, P. R. (2025). Theory of Multimode Squeezed Light Generation in Lossy Media. Quantum, 9, Article 1621. https://doi.org/10.22331/q-2025-02-04-1621","ieee":"D. A. Kopylov, T. Meier, and P. R. Sharapova, “Theory of Multimode Squeezed Light Generation in Lossy Media,” Quantum, vol. 9, Art. no. 1621, 2025, doi: 10.22331/q-2025-02-04-1621.","ama":"Kopylov DA, Meier T, Sharapova PR. Theory of Multimode Squeezed Light Generation in Lossy Media. Quantum. 2025;9. doi:10.22331/q-2025-02-04-1621","bibtex":"@article{Kopylov_Meier_Sharapova_2025, title={Theory of Multimode Squeezed Light Generation in Lossy Media}, volume={9}, DOI={10.22331/q-2025-02-04-1621}, number={1621}, journal={Quantum}, publisher={Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften}, author={Kopylov, Denis A. and Meier, Torsten and Sharapova, Polina R.}, year={2025} }","mla":"Kopylov, Denis A., et al. “Theory of Multimode Squeezed Light Generation in Lossy Media.” Quantum, vol. 9, 1621, Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften, 2025, doi:10.22331/q-2025-02-04-1621."},"project":[{"name":"PhoQC: PhoQC: Photonisches Quantencomputing","_id":"266"},{"name":"Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"title":"Theory of Multimode Squeezed Light Generation in Lossy Media","year":"2025","publication_identifier":{"issn":["2521-327X"]},"author":[{"full_name":"Kopylov, Denis A.","first_name":"Denis A.","last_name":"Kopylov"},{"id":"344","last_name":"Meier","first_name":"Torsten","orcid":"0000-0001-8864-2072","full_name":"Meier, Torsten"},{"full_name":"Sharapova, Polina R.","last_name":"Sharapova","first_name":"Polina R.","id":"60286"}],"publication_status":"published","date_updated":"2025-09-18T13:22:26Z","intvolume":" 9","article_number":"1621","language":[{"iso":"eng"}],"doi":"10.22331/q-2025-02-04-1621","publication":"Quantum","abstract":[{"lang":"eng","text":"A unified theoretical approach to describe the properties of multimode squeezed light generated in a lossy medium is presented. This approach is valid for Markovian environments and includes both a model of discrete losses based on the beamsplitter approach and a generalized continuous loss model based on the spatial Langevin equation. For an important class of Gaussian states, we derive master equations for the second-order correlation functions and illustrate their solution for both frequency-independent and frequency-dependent losses. Studying the mode structure, we demonstrate that in a lossy environment no broadband basis without quadrature correlations between the different broadband modes exists. Therefore, various techniques and strategies to introduce broadband modes can be considered. We show that the Mercer expansion and the Williamson-Euler decomposition do not provide modes in which the maximal squeezing contained in the system can be measured. In turn, we find a new broadband basis that maximizes squeezing in the lossy system and present an algorithm to construct it."}],"date_created":"2025-02-05T12:57:37Z","type":"journal_article","department":[{"_id":"15"},{"_id":"569"},{"_id":"170"},{"_id":"293"},{"_id":"35"},{"_id":"230"},{"_id":"623"},{"_id":"27"}]},{"language":[{"iso":"eng"}],"doi":"10.1364/optcon.569959","year":"2025","title":"TFLN channel waveguides of rib and strip type: Properties of guided modes","author":[{"full_name":"Hammer, Manfred","first_name":"Manfred","orcid":"0000-0002-6331-9348","last_name":"Hammer","id":"48077"},{"last_name":"Khan","first_name":"Shahriar","full_name":"Khan, Shahriar"},{"last_name":"Taheri","first_name":"Behnood","full_name":"Taheri, Behnood"},{"last_name":"Farheen","orcid":"0000-0001-7730-3489","first_name":"Henna","full_name":"Farheen, Henna","id":"53444"},{"id":"158","full_name":"Förstner, Jens","first_name":"Jens","orcid":"0000-0001-7059-9862","last_name":"Förstner"}],"publication_identifier":{"issn":["2770-0208"]},"date_updated":"2025-10-05T11:52:55Z","publication_status":"published","intvolume":" 4","file":[{"file_id":"61516","success":1,"content_type":"application/pdf","file_name":"2025-08 Hammer - Optics Continuum - TFLN channel waveguides of rib and strip type. Properties of guided modes (official version).pdf","access_level":"closed","file_size":5417636,"relation":"main_file","date_updated":"2025-10-05T11:48:25Z","date_created":"2025-10-05T11:48:25Z","creator":"fossie"}],"date_created":"2025-08-06T09:36:30Z","type":"journal_article","keyword":["tet_topic_waveguide"],"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"623"}],"publication":"Optics Continuum","issue":"10","abstract":[{"lang":"eng","text":"Straight dielectric waveguide channels made from slabs of thin-film lithium niobate (TFLN), or lithium niobate on insulator (LNOI), are investigated in the linear regime, for channels of rib and strip type with common trapezoidal cross sections, in Z-cut and X-cut samples at varying on-chip orientation. We clarify the theoretical basis for the waveguides with potentially non-diagonal core permittivity. Symmetry classes can be distinguished that differ in their consequences for potential modal degeneracy and polarization conversion. Our rigorous numerical analysis by means of a finite-element solver takes the anisotropy of the lithium niobate cores rigorously into account. We discuss extensive data for effective indices, polarization properties, and hybridization of guided modes, in single- and multimode channels. Scans over the waveguide width and orientation as primary parameters are complemented by a series of illustrations of vectorial mode profiles. These turn out to be essentially complex in cases of X-cut channels at non-crystal-axis-aligned orientations."}],"page":"2356","publisher":"Optica Publishing Group","_id":"60891","ddc":["530"],"user_id":"158","volume":4,"status":"public","has_accepted_license":"1","file_date_updated":"2025-10-05T11:48:25Z","citation":{"ieee":"M. Hammer, S. Khan, B. Taheri, H. Farheen, and J. Förstner, “TFLN channel waveguides of rib and strip type: Properties of guided modes,” Optics Continuum, vol. 4, no. 10, p. 2356, 2025, doi: 10.1364/optcon.569959.","apa":"Hammer, M., Khan, S., Taheri, B., Farheen, H., & Förstner, J. (2025). TFLN channel waveguides of rib and strip type: Properties of guided modes. Optics Continuum, 4(10), 2356. https://doi.org/10.1364/optcon.569959","short":"M. Hammer, S. Khan, B. Taheri, H. Farheen, J. Förstner, Optics Continuum 4 (2025) 2356.","chicago":"Hammer, Manfred, Shahriar Khan, Behnood Taheri, Henna Farheen, and Jens Förstner. “TFLN Channel Waveguides of Rib and Strip Type: Properties of Guided Modes.” Optics Continuum 4, no. 10 (2025): 2356. https://doi.org/10.1364/optcon.569959.","mla":"Hammer, Manfred, et al. “TFLN Channel Waveguides of Rib and Strip Type: Properties of Guided Modes.” Optics Continuum, vol. 4, no. 10, Optica Publishing Group, 2025, p. 2356, doi:10.1364/optcon.569959.","bibtex":"@article{Hammer_Khan_Taheri_Farheen_Förstner_2025, title={TFLN channel waveguides of rib and strip type: Properties of guided modes}, volume={4}, DOI={10.1364/optcon.569959}, number={10}, journal={Optics Continuum}, publisher={Optica Publishing Group}, author={Hammer, Manfred and Khan, Shahriar and Taheri, Behnood and Farheen, Henna and Förstner, Jens}, year={2025}, pages={2356} }","ama":"Hammer M, Khan S, Taheri B, Farheen H, Förstner J. TFLN channel waveguides of rib and strip type: Properties of guided modes. Optics Continuum. 2025;4(10):2356. doi:10.1364/optcon.569959"}},{"doi":"10.1117/12.3065734","user_id":"158","editor":[{"last_name":"Ni","first_name":"Xingjie","full_name":"Ni, Xingjie"},{"full_name":"Cai, Wenshan","last_name":"Cai","first_name":"Wenshan"}],"language":[{"iso":"eng"}],"_id":"61760","publisher":"SPIE","date_updated":"2025-10-08T15:22:30Z","publication_status":"published","status":"public","year":"2025","title":"Topology-optimized silicon nitride coupler for integrated single-photon emitters","author":[{"last_name":"Farheen","orcid":"0000-0001-7730-3489","first_name":"Henna","full_name":"Farheen, Henna","id":"53444"},{"full_name":"Chen, Yuheng","first_name":"Yuheng","last_name":"Chen"},{"full_name":"Chen, Peigang","last_name":"Chen","first_name":"Peigang"},{"last_name":"Kryvobok","first_name":"Artem","full_name":"Kryvobok, Artem"},{"last_name":"Peana","first_name":"Samuel","full_name":"Peana, Samuel"},{"full_name":"Senichev, Alexander","last_name":"Senichev","first_name":"Alexander"},{"first_name":"Vladimir M.","last_name":"Shalaev","full_name":"Shalaev, Vladimir M."},{"last_name":"Boltasseva","first_name":"Alexandra","full_name":"Boltasseva, Alexandra"},{"orcid":"0000-0001-7059-9862","last_name":"Förstner","first_name":"Jens","full_name":"Förstner, Jens","id":"158"},{"full_name":"Kildishev, Alexander V.","first_name":"Alexander V.","last_name":"Kildishev"}],"keyword":["tet_topic_waveguide"],"type":"conference","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"623"}],"date_created":"2025-10-08T15:20:13Z","abstract":[{"text":"We present a topology-optimized silicon nitride (Si3N4) coupler designed to enhance the coupling efficiency between integrated single-photon emitters and photonic waveguide modes. By leveraging inverse design techniques, we optimize the coupler’s geometry to maximize power transfer while maintaining fabrication feasibility by improving mode overlap and directional emission, addressing the challenge of low coupling efficiency caused by size mismatch and material incompatibility. Simulations demonstrate a substantial enhancement in photon extraction and waveguide coupling. This approach can be extended to other photonic devices, offering a versatile framework for improving quantum light-matter interactions in integrated photonics.","lang":"eng"}],"publication":"Photonic Computing: From Materials and Devices to Systems and Applications II","citation":{"bibtex":"@inproceedings{Farheen_Chen_Chen_Kryvobok_Peana_Senichev_Shalaev_Boltasseva_Förstner_Kildishev_2025, title={Topology-optimized silicon nitride coupler for integrated single-photon emitters}, DOI={10.1117/12.3065734}, booktitle={Photonic Computing: From Materials and Devices to Systems and Applications II}, publisher={SPIE}, author={Farheen, Henna and Chen, Yuheng and Chen, Peigang and Kryvobok, Artem and Peana, Samuel and Senichev, Alexander and Shalaev, Vladimir M. and Boltasseva, Alexandra and Förstner, Jens and Kildishev, Alexander V.}, editor={Ni, Xingjie and Cai, Wenshan}, year={2025} }","ama":"Farheen H, Chen Y, Chen P, et al. Topology-optimized silicon nitride coupler for integrated single-photon emitters. In: Ni X, Cai W, eds. Photonic Computing: From Materials and Devices to Systems and Applications II. SPIE; 2025. doi:10.1117/12.3065734","mla":"Farheen, Henna, et al. “Topology-Optimized Silicon Nitride Coupler for Integrated Single-Photon Emitters.” Photonic Computing: From Materials and Devices to Systems and Applications II, edited by Xingjie Ni and Wenshan Cai, SPIE, 2025, doi:10.1117/12.3065734.","short":"H. Farheen, Y. Chen, P. Chen, A. Kryvobok, S. Peana, A. Senichev, V.M. Shalaev, A. Boltasseva, J. Förstner, A.V. Kildishev, in: X. Ni, W. Cai (Eds.), Photonic Computing: From Materials and Devices to Systems and Applications II, SPIE, 2025.","chicago":"Farheen, Henna, Yuheng Chen, Peigang Chen, Artem Kryvobok, Samuel Peana, Alexander Senichev, Vladimir M. Shalaev, Alexandra Boltasseva, Jens Förstner, and Alexander V. Kildishev. “Topology-Optimized Silicon Nitride Coupler for Integrated Single-Photon Emitters.” In Photonic Computing: From Materials and Devices to Systems and Applications II, edited by Xingjie Ni and Wenshan Cai. SPIE, 2025. https://doi.org/10.1117/12.3065734.","ieee":"H. Farheen et al., “Topology-optimized silicon nitride coupler for integrated single-photon emitters,” in Photonic Computing: From Materials and Devices to Systems and Applications II, 2025, doi: 10.1117/12.3065734.","apa":"Farheen, H., Chen, Y., Chen, P., Kryvobok, A., Peana, S., Senichev, A., Shalaev, V. M., Boltasseva, A., Förstner, J., & Kildishev, A. V. (2025). Topology-optimized silicon nitride coupler for integrated single-photon emitters. In X. Ni & W. Cai (Eds.), Photonic Computing: From Materials and Devices to Systems and Applications II. SPIE. https://doi.org/10.1117/12.3065734"}},{"issue":"24","publication":"Optics Express","abstract":[{"lang":"eng","text":"Optical tweezer arrays of laser-cooled and individually controlled particles have revolutionized atomic, molecular, and optical physics. They afford exquisite capabilities for applications in quantum simulation of many-body physics, quantum computation, and sensing. Underlying this development is the technical maturity of generating scalable optical beams, enabled by active components and a high numerical aperture objective. However, such a complex combination of bulk optics outside the vacuum chamber is very sensitive to any vibration and drift. Here, we demonstrate the generation of a 3 × 3 static tweezer array with a single chip-scale multifunctional metasurface element in vacuum, replacing the meter-long free space optics. Fluorescence counts on the camera validate the successful trapping of the atomic ensemble array and showcase a promising strategy for integrated photonics with cold atom systems. The introduction of a polarization independent dual-wavelength metasurface significantly enhances fluorescence collection efficiency while reducing experimental complexity. This approach paves the way for scalable neutral atom platforms and offers a compelling route towards the realization of next generation quantum metasurfaces."}],"date_created":"2025-11-24T06:31:17Z","department":[{"_id":"15"},{"_id":"230"},{"_id":"289"},{"_id":"623"}],"type":"journal_article","publication_identifier":{"issn":["1094-4087"]},"author":[{"full_name":"Li, Donghao","last_name":"Li","first_name":"Donghao"},{"first_name":"Qiming","last_name":"Liao","full_name":"Liao, Qiming"},{"full_name":"Xu, Beining","last_name":"Xu","first_name":"Beining"},{"id":"30525","full_name":"Zentgraf, Thomas","first_name":"Thomas","last_name":"Zentgraf","orcid":"0000-0002-8662-1101"},{"first_name":"Emmanuel","last_name":"Narvaez Castaneda","full_name":"Narvaez Castaneda, Emmanuel"},{"last_name":"Zhou","first_name":"Yaoting","full_name":"Zhou, Yaoting"},{"full_name":"Qin, Keyu","first_name":"Keyu","last_name":"Qin"},{"full_name":"Xu, Zhongxiao","last_name":"Xu","first_name":"Zhongxiao"},{"last_name":"Shen","first_name":"Heng","full_name":"Shen, Heng"},{"full_name":"Huang, Lingling","last_name":"Huang","first_name":"Lingling"}],"title":"In vacuum metasurface for optical microtrap array","year":"2025","intvolume":" 33","article_type":"original","date_updated":"2025-11-24T06:35:19Z","publication_status":"published","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://opg.optica.org/oe/fulltext.cfm?uri=oe-33-24-51085","open_access":"1"}],"article_number":"51085","doi":"10.1364/oe.580201","citation":{"mla":"Li, Donghao, et al. “In Vacuum Metasurface for Optical Microtrap Array.” Optics Express, vol. 33, no. 24, 51085, Optica Publishing Group, 2025, doi:10.1364/oe.580201.","ama":"Li D, Liao Q, Xu B, et al. In vacuum metasurface for optical microtrap array. Optics Express. 2025;33(24). doi:10.1364/oe.580201","bibtex":"@article{Li_Liao_Xu_Zentgraf_Narvaez Castaneda_Zhou_Qin_Xu_Shen_Huang_2025, title={In vacuum metasurface for optical microtrap array}, volume={33}, DOI={10.1364/oe.580201}, number={2451085}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Li, Donghao and Liao, Qiming and Xu, Beining and Zentgraf, Thomas and Narvaez Castaneda, Emmanuel and Zhou, Yaoting and Qin, Keyu and Xu, Zhongxiao and Shen, Heng and Huang, Lingling}, year={2025} }","apa":"Li, D., Liao, Q., Xu, B., Zentgraf, T., Narvaez Castaneda, E., Zhou, Y., Qin, K., Xu, Z., Shen, H., & Huang, L. (2025). In vacuum metasurface for optical microtrap array. Optics Express, 33(24), Article 51085. https://doi.org/10.1364/oe.580201","ieee":"D. Li et al., “In vacuum metasurface for optical microtrap array,” Optics Express, vol. 33, no. 24, Art. no. 51085, 2025, doi: 10.1364/oe.580201.","short":"D. Li, Q. Liao, B. Xu, T. Zentgraf, E. Narvaez Castaneda, Y. Zhou, K. Qin, Z. Xu, H. Shen, L. Huang, Optics Express 33 (2025).","chicago":"Li, Donghao, Qiming Liao, Beining Xu, Thomas Zentgraf, Emmanuel Narvaez Castaneda, Yaoting Zhou, Keyu Qin, Zhongxiao Xu, Heng Shen, and Lingling Huang. “In Vacuum Metasurface for Optical Microtrap Array.” Optics Express 33, no. 24 (2025). https://doi.org/10.1364/oe.580201."},"quality_controlled":"1","oa":"1","status":"public","_id":"62286","publisher":"Optica Publishing Group","volume":33,"user_id":"30525"},{"user_id":"38254","publication_date":"2025-01-23","_id":"62639","ipn":"DE102023212604B3","date_updated":"2025-11-27T07:07:16Z","author":[{"id":"38254","first_name":"Stephan","last_name":"Kruse","full_name":"Kruse, Stephan"},{"id":"26263","full_name":"Silberhorn, Christine","first_name":"Christine","last_name":"Silberhorn"},{"id":"27150","first_name":"Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 ","full_name":"Brecht, Benjamin"},{"id":"39217","last_name":"Schwabe","first_name":"Tobias","full_name":"Schwabe, Tobias"}],"title":"Optisch basierter Digital-Analog-Umsetzer","year":"2025","status":"public","department":[{"_id":"58"},{"_id":"623"},{"_id":"288"}],"type":"patent","date_created":"2025-11-27T07:00:50Z","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."}},{"oa":"1","external_id":{"arxiv":["2506.05519"]},"quality_controlled":"1","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.","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} }","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","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.","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","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)."},"volume":112,"user_id":"22501","publisher":"American Physical Society (APS)","_id":"62749","status":"public","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"type":"journal_article","date_created":"2025-12-02T19:21:33Z","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."}],"issue":"22","publication":"Physical Review B","doi":"10.1103/1ctr-csjy","language":[{"iso":"eng"}],"article_number":"224106","main_file_link":[{"url":"https://arxiv.org/abs/2506.05519","open_access":"1"}],"article_type":"original","intvolume":" 112","publication_status":"published","date_updated":"2025-12-02T19:23:55Z","publication_identifier":{"issn":["2469-9950","2469-9969"]},"author":[{"last_name":"Hempel","first_name":"F.","full_name":"Hempel, F."},{"id":"22501","full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing","first_name":"Michael"},{"last_name":"Vernuccio","first_name":"F.","full_name":"Vernuccio, F."},{"full_name":"Spychala, K. J.","last_name":"Spychala","first_name":"K. J."},{"last_name":"Buschbeck","first_name":"R.","full_name":"Buschbeck, R."},{"first_name":"G.","last_name":"Cerullo","full_name":"Cerullo, G."},{"last_name":"Polli","first_name":"D.","full_name":"Polli, D."},{"full_name":"Eng, L. M.","last_name":"Eng","first_name":"L. M."}],"title":"Phonon dephasing times determined with time-delayed broadband coherent anti-Stokes Raman scattering","year":"2025"},{"volume":17,"user_id":"85353","publisher":"Optica Publishing Group","_id":"62860","status":"public","citation":{"mla":"Sena, Matheus, et al. “High-Fidelity Quantum Entanglement Distribution in Metropolitan Fiber Networks with Co-Propagating Classical Traffic.” Journal of Optical Communications and Networking, vol. 17, no. 12, 1072, Optica Publishing Group, 2025, doi:10.1364/jocn.575396.","bibtex":"@article{Sena_Flament_Andrewski_Caltzidis_Bigagli_Rieser_Bello Portmann_Sekelsky_Braun_Craddock_et al._2025, title={High-fidelity quantum entanglement distribution in metropolitan fiber networks with co-propagating classical traffic}, volume={17}, DOI={10.1364/jocn.575396}, number={121072}, journal={Journal of Optical Communications and Networking}, publisher={Optica Publishing Group}, author={Sena, Matheus and Flament, Mael and Andrewski, Shane and Caltzidis, Ioannis and Bigagli, Niccolò and Rieser, Thomas and Bello Portmann, Gabriel and Sekelsky, Rourke and Braun, Ralf-Peter and Craddock, Alexander N. and et al.}, year={2025} }","ama":"Sena M, Flament M, Andrewski S, et al. High-fidelity quantum entanglement distribution in metropolitan fiber networks with co-propagating classical traffic. Journal of Optical Communications and Networking. 2025;17(12). doi:10.1364/jocn.575396","ieee":"M. Sena et al., “High-fidelity quantum entanglement distribution in metropolitan fiber networks with co-propagating classical traffic,” Journal of Optical Communications and Networking, vol. 17, no. 12, Art. no. 1072, 2025, doi: 10.1364/jocn.575396.","apa":"Sena, M., Flament, M., Andrewski, S., Caltzidis, I., Bigagli, N., Rieser, T., Bello Portmann, G., Sekelsky, R., Braun, R.-P., Craddock, A. N., Schulz, M., Jöns, K., Ritter, M., Geitz, M., Holschke, O., & Namazi, M. (2025). High-fidelity quantum entanglement distribution in metropolitan fiber networks with co-propagating classical traffic. Journal of Optical Communications and Networking, 17(12), Article 1072. https://doi.org/10.1364/jocn.575396","chicago":"Sena, Matheus, Mael Flament, Shane Andrewski, Ioannis Caltzidis, Niccolò Bigagli, Thomas Rieser, Gabriel Bello Portmann, et al. “High-Fidelity Quantum Entanglement Distribution in Metropolitan Fiber Networks with Co-Propagating Classical Traffic.” Journal of Optical Communications and Networking 17, no. 12 (2025). https://doi.org/10.1364/jocn.575396.","short":"M. Sena, M. Flament, S. Andrewski, I. Caltzidis, N. Bigagli, T. Rieser, G. Bello Portmann, R. Sekelsky, R.-P. Braun, A.N. Craddock, M. Schulz, K. Jöns, M. Ritter, M. Geitz, O. Holschke, M. Namazi, Journal of Optical Communications and Networking 17 (2025)."},"doi":"10.1364/jocn.575396","language":[{"iso":"eng"}],"article_number":"1072","intvolume":" 17","publication_status":"published","date_updated":"2025-12-04T13:37:02Z","author":[{"last_name":"Sena","first_name":"Matheus","full_name":"Sena, Matheus"},{"full_name":"Flament, Mael","last_name":"Flament","first_name":"Mael"},{"first_name":"Shane","last_name":"Andrewski","full_name":"Andrewski, Shane"},{"first_name":"Ioannis","last_name":"Caltzidis","full_name":"Caltzidis, Ioannis"},{"full_name":"Bigagli, Niccolò","last_name":"Bigagli","first_name":"Niccolò"},{"full_name":"Rieser, Thomas","last_name":"Rieser","first_name":"Thomas"},{"first_name":"Gabriel","last_name":"Bello Portmann","full_name":"Bello Portmann, Gabriel"},{"first_name":"Rourke","last_name":"Sekelsky","full_name":"Sekelsky, Rourke"},{"first_name":"Ralf-Peter","last_name":"Braun","full_name":"Braun, Ralf-Peter"},{"full_name":"Craddock, Alexander N.","last_name":"Craddock","first_name":"Alexander N."},{"first_name":"Maximilian","last_name":"Schulz","full_name":"Schulz, Maximilian"},{"id":"85353","first_name":"Klaus","last_name":"Jöns","full_name":"Jöns, Klaus"},{"last_name":"Ritter","first_name":"Michaela","full_name":"Ritter, Michaela"},{"first_name":"Marc","last_name":"Geitz","full_name":"Geitz, Marc"},{"first_name":"Oliver","last_name":"Holschke","full_name":"Holschke, Oliver"},{"full_name":"Namazi, Mehdi","last_name":"Namazi","first_name":"Mehdi"}],"publication_identifier":{"issn":["1943-0620","1943-0639"]},"year":"2025","title":"High-fidelity quantum entanglement distribution in metropolitan fiber networks with co-propagating classical traffic","department":[{"_id":"623"},{"_id":"15"}],"type":"journal_article","date_created":"2025-12-04T12:20:01Z","abstract":[{"lang":"eng","text":"\r\n The Quantum Internet, a network of quantum-enabled infrastructure, represents the next frontier in telecommunications, promising capabilities that cannot be attained by classical counterparts. A crucial step in realizing such large-scale quantum networks is the integration of entanglement distribution within existing telecommunication infrastructure. Here, we demonstrate a real-world scalable quantum networking testbed deployed within Deutsche Telekom’s metropolitan fibers in Berlin. Using commercially available quantum devices and standard add-drop multiplexing hardware, we distributed polarization-entangled photon pairs over dynamically selectable looped fiber paths ranging from 10 m to 60 km and showed entanglement distribution over up to approximately 100 km. Quantum signals, transmitted at 1324 nm (O-band), coexist with conventional bidirectional C-band traffic without dedicated fibers or infrastructure changes. Active stabilization of the polarization enables robust long-term performance, achieving entanglement Bell-state fidelity bounds between 85% and 99% and Clauser–Horne–Shimony–Holt parameter\r\n S\r\n -values between 2.36 and 2.74 during continuous multiday operation. By achieving a high-fidelity entanglement distribution with less than 1.5% downtime, we confirm the feasibility of hybrid quantum-classical networks under real-world conditions at the metropolitan scale. These results establish deployment benchmarks and provide a practical roadmap for telecom operators to integrate quantum capabilities.\r\n "}],"publication":"Journal of Optical Communications and Networking","issue":"12"},{"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","publication_identifier":{"issn":["2643-1564"]},"author":[{"full_name":"Kopylov, Denis A.","last_name":"Kopylov","first_name":"Denis A."},{"last_name":"Stefszky","first_name":"Michael","full_name":"Stefszky, Michael","id":"42777"},{"id":"344","full_name":"Meier, Torsten","orcid":"0000-0001-8864-2072","first_name":"Torsten","last_name":"Meier"},{"full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine","id":"26263"},{"id":"60286","first_name":"Polina R.","last_name":"Sharapova","full_name":"Sharapova, Polina R."}],"date_updated":"2025-12-05T09:55:22Z","publication_status":"published","intvolume":" 7","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"}],"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."}],"publisher":"American Physical Society (APS)","_id":"62911","user_id":"16199","volume":7,"status":"public","citation":{"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","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} }","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.","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).","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","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."},"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"}]},{"date_updated":"2025-12-05T09:40:24Z","publication_status":"published","author":[{"id":"73659","full_name":"Hunstig, Anna","last_name":"Hunstig","first_name":"Anna"},{"full_name":"Peitz, Sebastian","last_name":"Peitz","orcid":"0000-0002-3389-793X","first_name":"Sebastian","id":"47427"},{"last_name":"Rose","orcid":"0000-0002-3079-5428","first_name":"Hendrik","full_name":"Rose, Hendrik","id":"55958"},{"id":"344","full_name":"Meier, Torsten","last_name":"Meier","orcid":"0000-0001-8864-2072","first_name":"Torsten"}],"title":"Accelerating the analysis of optical quantum systems using the Koopman operator","year":"2025","status":"public","doi":"10.1109/cdc56724.2024.10886589","user_id":"16199","_id":"62913","language":[{"iso":"eng"}],"publisher":"IEEE","project":[{"name":"PhoQC: Photonisches Quantencomputing","_id":"266"}],"citation":{"ieee":"A. Hunstig, S. Peitz, H. Rose, and T. Meier, “Accelerating the analysis of optical quantum systems using the Koopman operator,” 2025, doi: 10.1109/cdc56724.2024.10886589.","apa":"Hunstig, A., Peitz, S., Rose, H., & Meier, T. (2025). Accelerating the analysis of optical quantum systems using the Koopman operator. 2024 IEEE 63rd Conference on Decision and Control (CDC). https://doi.org/10.1109/cdc56724.2024.10886589","chicago":"Hunstig, Anna, Sebastian Peitz, Hendrik Rose, and Torsten Meier. “Accelerating the Analysis of Optical Quantum Systems Using the Koopman Operator.” In 2024 IEEE 63rd Conference on Decision and Control (CDC). IEEE, 2025. https://doi.org/10.1109/cdc56724.2024.10886589.","short":"A. Hunstig, S. Peitz, H. Rose, T. Meier, in: 2024 IEEE 63rd Conference on Decision and Control (CDC), IEEE, 2025.","mla":"Hunstig, Anna, et al. “Accelerating the Analysis of Optical Quantum Systems Using the Koopman Operator.” 2024 IEEE 63rd Conference on Decision and Control (CDC), IEEE, 2025, doi:10.1109/cdc56724.2024.10886589.","bibtex":"@inproceedings{Hunstig_Peitz_Rose_Meier_2025, title={Accelerating the analysis of optical quantum systems using the Koopman operator}, DOI={10.1109/cdc56724.2024.10886589}, booktitle={2024 IEEE 63rd Conference on Decision and Control (CDC)}, publisher={IEEE}, author={Hunstig, Anna and Peitz, Sebastian and Rose, Hendrik and Meier, Torsten}, year={2025} }","ama":"Hunstig A, Peitz S, Rose H, Meier T. Accelerating the analysis of optical quantum systems using the Koopman operator. In: 2024 IEEE 63rd Conference on Decision and Control (CDC). IEEE; 2025. doi:10.1109/cdc56724.2024.10886589"},"publication":"2024 IEEE 63rd Conference on Decision and Control (CDC)","department":[{"_id":"15"},{"_id":"170"},{"_id":"293"},{"_id":"230"},{"_id":"623"},{"_id":"35"}],"type":"conference","date_created":"2025-12-05T09:37:58Z"},{"project":[{"_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":"266","name":"PhoQC: Photonisches Quantencomputing"}],"citation":{"ama":"Kopylov DA, Offen C, Ares L, et al. Multiphoton, multimode state classification for nonlinear optical circuits. Physical Review Research. 2025;7(3). doi:10.1103/sv6z-v1gk","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={10.1103/sv6z-v1gk}, 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.” Physical Review Research, vol. 7, no. 3, 033062, American Physical Society (APS), 2025, doi:10.1103/sv6z-v1gk.","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.” Physical Review Research 7, no. 3 (2025). https://doi.org/10.1103/sv6z-v1gk.","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).","apa":"Kopylov, D. A., Offen, C., Ares, L., Wembe Moafo, B. E., Ober-Blöbaum, S., Meier, T., Sharapova, P. R., & Sperling, J. (2025). Multiphoton, multimode state classification for nonlinear optical circuits. Physical Review Research, 7(3), Article 033062. https://doi.org/10.1103/sv6z-v1gk","ieee":"D. A. Kopylov et al., “Multiphoton, multimode state classification for nonlinear optical circuits,” Physical Review Research, vol. 7, no. 3, Art. no. 033062, 2025, doi: 10.1103/sv6z-v1gk."},"status":"public","user_id":"16199","volume":7,"_id":"62980","publisher":"American Physical Society (APS)","abstract":[{"lang":"eng","text":"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."}],"publication":"Physical Review Research","issue":"3","type":"journal_article","department":[{"_id":"15"},{"_id":"569"},{"_id":"170"},{"_id":"293"},{"_id":"706"},{"_id":"636"},{"_id":"35"},{"_id":"230"},{"_id":"429"},{"_id":"623"}],"date_created":"2025-12-09T09:08:39Z","date_updated":"2025-12-09T09:10:01Z","publication_status":"published","intvolume":" 7","title":"Multiphoton, multimode state classification for nonlinear optical circuits","year":"2025","publication_identifier":{"issn":["2643-1564"]},"author":[{"first_name":"Denis A.","last_name":"Kopylov","full_name":"Kopylov, Denis A."},{"full_name":"Offen, Christian","orcid":"0000-0002-5940-8057","first_name":"Christian","last_name":"Offen","id":"85279"},{"first_name":"Laura","last_name":"Ares","full_name":"Ares, Laura"},{"full_name":"Wembe Moafo, Boris Edgar","last_name":"Wembe Moafo","first_name":"Boris Edgar","id":"95394"},{"id":"16494","full_name":"Ober-Blöbaum, Sina","first_name":"Sina","last_name":"Ober-Blöbaum"},{"last_name":"Meier","orcid":"0000-0001-8864-2072","first_name":"Torsten","full_name":"Meier, Torsten","id":"344"},{"id":"60286","last_name":"Sharapova","first_name":"Polina R.","full_name":"Sharapova, Polina R."},{"id":"75127","first_name":"Jan","last_name":"Sperling","orcid":"0000-0002-5844-3205","full_name":"Sperling, Jan"}],"doi":"10.1103/sv6z-v1gk","article_number":"033062","language":[{"iso":"eng"}]},{"title":"Predetection squeezing as a resource for high-dimensional Bell-state measurements","year":"2025","author":[{"full_name":"Bianchi, Luca","last_name":"Bianchi","first_name":"Luca"},{"last_name":"Marconi","first_name":"Carlo","full_name":"Marconi, Carlo"},{"id":"75127","full_name":"Sperling, Jan","orcid":"0000-0002-5844-3205","first_name":"Jan","last_name":"Sperling"},{"full_name":"Bacco, Davide","first_name":"Davide","last_name":"Bacco"}],"publication_identifier":{"issn":["2643-1564"]},"publication_status":"published","date_updated":"2025-12-10T13:36:11Z","intvolume":" 7","article_number":"023038","language":[{"iso":"eng"}],"doi":"10.1103/physrevresearch.7.023038","publication":"Physical Review Research","issue":"2","abstract":[{"text":"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.","lang":"eng"}],"date_created":"2025-12-10T13:34:53Z","type":"journal_article","department":[{"_id":"623"},{"_id":"15"},{"_id":"170"},{"_id":"706"},{"_id":"429"}],"status":"public","_id":"63021","publisher":"American Physical Society (APS)","user_id":"75127","volume":7,"citation":{"bibtex":"@article{Bianchi_Marconi_Sperling_Bacco_2025, title={Predetection squeezing as a resource for high-dimensional Bell-state measurements}, volume={7}, DOI={10.1103/physrevresearch.7.023038}, 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} }","ama":"Bianchi L, Marconi C, Sperling J, Bacco D. Predetection squeezing as a resource for high-dimensional Bell-state measurements. Physical Review Research. 2025;7(2). doi:10.1103/physrevresearch.7.023038","short":"L. Bianchi, C. Marconi, J. Sperling, D. Bacco, Physical Review Research 7 (2025).","chicago":"Bianchi, Luca, Carlo Marconi, Jan Sperling, and Davide Bacco. “Predetection Squeezing as a Resource for High-Dimensional Bell-State Measurements.” Physical Review Research 7, no. 2 (2025). https://doi.org/10.1103/physrevresearch.7.023038.","ieee":"L. Bianchi, C. Marconi, J. Sperling, and D. Bacco, “Predetection squeezing as a resource for high-dimensional Bell-state measurements,” Physical Review Research, vol. 7, no. 2, Art. no. 023038, 2025, doi: 10.1103/physrevresearch.7.023038.","apa":"Bianchi, L., Marconi, C., Sperling, J., & Bacco, D. (2025). Predetection squeezing as a resource for high-dimensional Bell-state measurements. Physical Review Research, 7(2), Article 023038. https://doi.org/10.1103/physrevresearch.7.023038","mla":"Bianchi, Luca, et al. “Predetection Squeezing as a Resource for High-Dimensional Bell-State Measurements.” Physical Review Research, vol. 7, no. 2, 023038, American Physical Society (APS), 2025, doi:10.1103/physrevresearch.7.023038."}}]