[{"_id":"62749","user_id":"22501","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"article_type":"original","article_number":"224106","type":"journal_article","status":"public","date_updated":"2025-12-02T19:23:55Z","oa":"1","author":[{"last_name":"Hempel","full_name":"Hempel, F.","first_name":"F."},{"id":"22501","full_name":"Rüsing, Michael","last_name":"Rüsing","orcid":"0000-0003-4682-4577","first_name":"Michael"},{"last_name":"Vernuccio","full_name":"Vernuccio, F.","first_name":"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.","full_name":"Polli, D.","last_name":"Polli"},{"last_name":"Eng","full_name":"Eng, L. M.","first_name":"L. M."}],"volume":112,"main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2506.05519"}],"doi":"10.1103/1ctr-csjy","publication_status":"published","publication_identifier":{"issn":["2469-9950","2469-9969"]},"citation":{"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","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} }","short":"F. Hempel, M. Rüsing, F. Vernuccio, K.J. Spychala, R. Buschbeck, G. Cerullo, D. Polli, L.M. Eng, Physical Review B 112 (2025).","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.","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.","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.","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"},"intvolume":" 112","external_id":{"arxiv":["2506.05519"]},"language":[{"iso":"eng"}],"publication":"Physical Review B","abstract":[{"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 𝑠⁢𝑝3 peak.","lang":"eng"}],"publisher":"American Physical Society (APS)","date_created":"2025-12-02T19:21:33Z","title":"Phonon dephasing times determined with time-delayed broadband coherent anti-Stokes Raman scattering","quality_controlled":"1","issue":"22","year":"2025"},{"_id":"62860","user_id":"85353","department":[{"_id":"623"},{"_id":"15"}],"article_number":"1072","language":[{"iso":"eng"}],"type":"journal_article","publication":"Journal of Optical Communications and Networking","abstract":[{"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 ","lang":"eng"}],"status":"public","date_updated":"2025-12-04T13:37:02Z","publisher":"Optica Publishing Group","author":[{"full_name":"Sena, Matheus","last_name":"Sena","first_name":"Matheus"},{"full_name":"Flament, Mael","last_name":"Flament","first_name":"Mael"},{"full_name":"Andrewski, Shane","last_name":"Andrewski","first_name":"Shane"},{"first_name":"Ioannis","last_name":"Caltzidis","full_name":"Caltzidis, Ioannis"},{"last_name":"Bigagli","full_name":"Bigagli, Niccolò","first_name":"Niccolò"},{"full_name":"Rieser, Thomas","last_name":"Rieser","first_name":"Thomas"},{"first_name":"Gabriel","full_name":"Bello Portmann, Gabriel","last_name":"Bello Portmann"},{"full_name":"Sekelsky, Rourke","last_name":"Sekelsky","first_name":"Rourke"},{"last_name":"Braun","full_name":"Braun, Ralf-Peter","first_name":"Ralf-Peter"},{"first_name":"Alexander N.","full_name":"Craddock, Alexander N.","last_name":"Craddock"},{"full_name":"Schulz, Maximilian","last_name":"Schulz","first_name":"Maximilian"},{"full_name":"Jöns, Klaus","id":"85353","last_name":"Jöns","first_name":"Klaus"},{"full_name":"Ritter, Michaela","last_name":"Ritter","first_name":"Michaela"},{"full_name":"Geitz, Marc","last_name":"Geitz","first_name":"Marc"},{"last_name":"Holschke","full_name":"Holschke, Oliver","first_name":"Oliver"},{"last_name":"Namazi","full_name":"Namazi, Mehdi","first_name":"Mehdi"}],"date_created":"2025-12-04T12:20:01Z","volume":17,"title":"High-fidelity quantum entanglement distribution in metropolitan fiber networks with co-propagating classical traffic","doi":"10.1364/jocn.575396","publication_status":"published","publication_identifier":{"issn":["1943-0620","1943-0639"]},"issue":"12","year":"2025","citation":{"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).","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} }","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","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","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.","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."},"intvolume":" 17"},{"volume":7,"date_created":"2025-12-05T09:33:36Z","author":[{"last_name":"Kopylov","full_name":"Kopylov, Denis A.","first_name":"Denis A."},{"full_name":"Stefszky, Michael","id":"42777","last_name":"Stefszky","first_name":"Michael"},{"first_name":"Torsten","id":"344","full_name":"Meier, Torsten","last_name":"Meier","orcid":"0000-0001-8864-2072"},{"full_name":"Silberhorn, Christine","id":"26263","last_name":"Silberhorn","first_name":"Christine"},{"last_name":"Sharapova","full_name":"Sharapova, Polina R.","id":"60286","first_name":"Polina R."}],"publisher":"American Physical Society (APS)","date_updated":"2025-12-05T09:55:22Z","doi":"10.1103/zp72-7qwl","title":"Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation","issue":"3","publication_identifier":{"issn":["2643-1564"]},"publication_status":"published","intvolume":" 7","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","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.","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.","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} }","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"},"year":"2025","department":[{"_id":"15"},{"_id":"569"},{"_id":"170"},{"_id":"293"},{"_id":"288"},{"_id":"230"},{"_id":"623"},{"_id":"429"},{"_id":"35"}],"user_id":"16199","_id":"62911","project":[{"name":"PhoQC: Photonisches Quantencomputing","_id":"266"},{"_id":"53","name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"},{"name":"TRR 142 - Project Area C","_id":"56"},{"name":"TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen Systemen: Eine theoretische Analyse","_id":"174"}],"language":[{"iso":"eng"}],"article_number":"033122","publication":"Physical Review Research","type":"journal_article","status":"public","abstract":[{"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.","lang":"eng"}]},{"language":[{"iso":"eng"}],"department":[{"_id":"15"},{"_id":"170"},{"_id":"293"},{"_id":"230"},{"_id":"623"},{"_id":"35"}],"user_id":"16199","_id":"62913","project":[{"name":"PhoQC: Photonisches Quantencomputing","_id":"266"}],"status":"public","publication":"2024 IEEE 63rd Conference on Decision and Control (CDC)","type":"conference","doi":"10.1109/cdc56724.2024.10886589","title":"Accelerating the analysis of optical quantum systems using the Koopman operator","date_created":"2025-12-05T09:37:58Z","author":[{"first_name":"Anna","last_name":"Hunstig","full_name":"Hunstig, Anna","id":"73659"},{"orcid":"0000-0002-3389-793X","last_name":"Peitz","id":"47427","full_name":"Peitz, Sebastian","first_name":"Sebastian"},{"first_name":"Hendrik","last_name":"Rose","orcid":"0000-0002-3079-5428","id":"55958","full_name":"Rose, Hendrik"},{"orcid":"0000-0001-8864-2072","last_name":"Meier","full_name":"Meier, Torsten","id":"344","first_name":"Torsten"}],"date_updated":"2025-12-05T09:40:24Z","publisher":"IEEE","citation":{"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.","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.","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","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","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.","short":"A. Hunstig, S. Peitz, H. Rose, T. Meier, in: 2024 IEEE 63rd Conference on Decision and Control (CDC), IEEE, 2025.","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} }"},"year":"2025","publication_status":"published"},{"publication_identifier":{"issn":["2643-1564"]},"publication_status":"published","issue":"3","year":"2025","intvolume":" 7","citation":{"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","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.","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).","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} }","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","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.","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."},"publisher":"American Physical Society (APS)","date_updated":"2025-12-09T09:10:01Z","volume":7,"author":[{"first_name":"Denis A.","last_name":"Kopylov","full_name":"Kopylov, Denis A."},{"first_name":"Christian","id":"85279","full_name":"Offen, Christian","orcid":"0000-0002-5940-8057","last_name":"Offen"},{"full_name":"Ares, Laura","last_name":"Ares","first_name":"Laura"},{"last_name":"Wembe Moafo","id":"95394","full_name":"Wembe Moafo, Boris Edgar","first_name":"Boris Edgar"},{"id":"16494","full_name":"Ober-Blöbaum, Sina","last_name":"Ober-Blöbaum","first_name":"Sina"},{"first_name":"Torsten","last_name":"Meier","orcid":"0000-0001-8864-2072","id":"344","full_name":"Meier, Torsten"},{"last_name":"Sharapova","full_name":"Sharapova, Polina R.","id":"60286","first_name":"Polina R."},{"orcid":"0000-0002-5844-3205","last_name":"Sperling","full_name":"Sperling, Jan","id":"75127","first_name":"Jan"}],"date_created":"2025-12-09T09:08:39Z","title":"Multiphoton, multimode state classification for nonlinear optical circuits","doi":"10.1103/sv6z-v1gk","publication":"Physical Review Research","type":"journal_article","abstract":[{"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.","lang":"eng"}],"status":"public","_id":"62980","project":[{"name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"},{"_id":"56","name":"TRR 142 - Project Area C"},{"name":"TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen Systemen: Eine theoretische Analyse","_id":"174"},{"name":"PhoQC: Photonisches Quantencomputing","_id":"266"}],"department":[{"_id":"15"},{"_id":"569"},{"_id":"170"},{"_id":"293"},{"_id":"706"},{"_id":"636"},{"_id":"35"},{"_id":"230"},{"_id":"429"},{"_id":"623"}],"user_id":"16199","article_number":"033062","language":[{"iso":"eng"}]},{"year":"2025","citation":{"ama":"Meier T, Sharapova PR, Sperling J, Ober-Blöbaum S, Wembe Moafo BE, Offen C. Multiphoton, multimode state classification for nonlinear optical circuits. Published online 2025.","chicago":"Meier, Torsten, Polina R. Sharapova, Jan Sperling, Sina Ober-Blöbaum, Boris Edgar Wembe Moafo, and Christian Offen. “Multiphoton, Multimode State Classification for Nonlinear Optical Circuits,” 2025.","ieee":"T. Meier, P. R. Sharapova, J. Sperling, S. Ober-Blöbaum, B. E. Wembe Moafo, and C. Offen, “Multiphoton, multimode state classification for nonlinear optical circuits.” 2025.","apa":"Meier, T., Sharapova, P. R., Sperling, J., Ober-Blöbaum, S., Wembe Moafo, B. E., & Offen, C. (2025). Multiphoton, multimode state classification for nonlinear optical circuits.","short":"T. Meier, P.R. Sharapova, J. Sperling, S. Ober-Blöbaum, B.E. Wembe Moafo, C. Offen, (2025).","mla":"Meier, Torsten, et al. Multiphoton, Multimode State Classification for Nonlinear Optical Circuits. 2025.","bibtex":"@article{Meier_Sharapova_Sperling_Ober-Blöbaum_Wembe Moafo_Offen_2025, title={Multiphoton, multimode state classification for nonlinear optical circuits}, author={Meier, Torsten and Sharapova, Polina R. and Sperling, Jan and Ober-Blöbaum, Sina and Wembe Moafo, Boris Edgar and Offen, Christian}, year={2025} }"},"date_updated":"2025-12-09T09:10:23Z","author":[{"full_name":"Meier, Torsten","id":"344","orcid":"0000-0001-8864-2072","last_name":"Meier","first_name":"Torsten"},{"first_name":"Polina R.","last_name":"Sharapova","id":"60286","full_name":"Sharapova, Polina R."},{"first_name":"Jan","id":"75127","full_name":"Sperling, Jan","last_name":"Sperling","orcid":"0000-0002-5844-3205"},{"first_name":"Sina","last_name":"Ober-Blöbaum","id":"16494","full_name":"Ober-Blöbaum, Sina"},{"last_name":"Wembe Moafo","id":"95394","full_name":"Wembe Moafo, Boris Edgar","first_name":"Boris Edgar"},{"orcid":"0000-0002-5940-8057","last_name":"Offen","full_name":"Offen, Christian","id":"85279","first_name":"Christian"}],"date_created":"2025-12-09T08:59:27Z","title":"Multiphoton, multimode state classification for nonlinear optical circuits","type":"preprint","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 being 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."}],"status":"public","_id":"62979","project":[{"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"},{"_id":"266","name":"PhoQC: Photonisches Quantencomputing"}],"department":[{"_id":"15"},{"_id":"170"},{"_id":"293"},{"_id":"706"},{"_id":"636"},{"_id":"230"},{"_id":"623"},{"_id":"429"},{"_id":"35"}],"user_id":"16199","language":[{"iso":"eng"}]},{"article_number":"023038","_id":"63021","user_id":"75127","department":[{"_id":"623"},{"_id":"15"},{"_id":"170"},{"_id":"706"},{"_id":"429"}],"status":"public","type":"journal_article","doi":"10.1103/physrevresearch.7.023038","date_updated":"2025-12-10T13:36:11Z","author":[{"first_name":"Luca","full_name":"Bianchi, Luca","last_name":"Bianchi"},{"last_name":"Marconi","full_name":"Marconi, Carlo","first_name":"Carlo"},{"first_name":"Jan","full_name":"Sperling, Jan","id":"75127","orcid":"0000-0002-5844-3205","last_name":"Sperling"},{"first_name":"Davide","last_name":"Bacco","full_name":"Bacco, Davide"}],"volume":7,"citation":{"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.","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} }","short":"L. Bianchi, C. Marconi, J. Sperling, D. Bacco, Physical Review Research 7 (2025).","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","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","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."},"intvolume":" 7","publication_status":"published","publication_identifier":{"issn":["2643-1564"]},"language":[{"iso":"eng"}],"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"}],"publication":"Physical Review Research","title":"Predetection squeezing as a resource for high-dimensional Bell-state measurements","publisher":"American Physical Society (APS)","date_created":"2025-12-10T13:34:53Z","year":"2025","issue":"2"},{"publication_status":"published","publication_identifier":{"issn":["2643-1564"]},"issue":"3","year":"2025","citation":{"short":"S. Bermúdez-Feijóo, E. Zubizarreta Casalengua, K. Müller, K. Jöns, Physical Review Research 7 (2025).","mla":"Bermúdez-Feijóo, Santiago, et al. “Spectral Correlations of Dynamical Resonance Fluorescence.” Physical Review Research, vol. 7, no. 3, 033296, American Physical Society (APS), 2025, doi:10.1103/jmy9-bd3l.","bibtex":"@article{Bermúdez-Feijóo_Zubizarreta Casalengua_Müller_Jöns_2025, title={Spectral correlations of dynamical resonance fluorescence}, volume={7}, DOI={10.1103/jmy9-bd3l}, number={3033296}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Bermúdez-Feijóo, Santiago and Zubizarreta Casalengua, Eduardo and Müller, Kai and Jöns, Klaus}, year={2025} }","apa":"Bermúdez-Feijóo, S., Zubizarreta Casalengua, E., Müller, K., & Jöns, K. (2025). Spectral correlations of dynamical resonance fluorescence. Physical Review Research, 7(3), Article 033296. https://doi.org/10.1103/jmy9-bd3l","ama":"Bermúdez-Feijóo S, Zubizarreta Casalengua E, Müller K, Jöns K. Spectral correlations of dynamical resonance fluorescence. Physical Review Research. 2025;7(3). doi:10.1103/jmy9-bd3l","chicago":"Bermúdez-Feijóo, Santiago, Eduardo Zubizarreta Casalengua, Kai Müller, and Klaus Jöns. “Spectral Correlations of Dynamical Resonance Fluorescence.” Physical Review Research 7, no. 3 (2025). https://doi.org/10.1103/jmy9-bd3l.","ieee":"S. Bermúdez-Feijóo, E. Zubizarreta Casalengua, K. Müller, and K. Jöns, “Spectral correlations of dynamical resonance fluorescence,” Physical Review Research, vol. 7, no. 3, Art. no. 033296, 2025, doi: 10.1103/jmy9-bd3l."},"intvolume":" 7","publisher":"American Physical Society (APS)","date_updated":"2025-12-11T12:52:24Z","date_created":"2025-12-04T12:19:04Z","author":[{"last_name":"Bermúdez-Feijóo","full_name":"Bermúdez-Feijóo, Santiago","first_name":"Santiago"},{"full_name":"Zubizarreta Casalengua, Eduardo","last_name":"Zubizarreta Casalengua","first_name":"Eduardo"},{"first_name":"Kai","full_name":"Müller, Kai","last_name":"Müller"},{"last_name":"Jöns","id":"85353","full_name":"Jöns, Klaus","first_name":"Klaus"}],"volume":7,"title":"Spectral correlations of dynamical resonance fluorescence","doi":"10.1103/jmy9-bd3l","type":"journal_article","publication":"Physical Review Research","abstract":[{"text":"Frequency-filtered photon correlations have been proven to be extremely useful in grasping how the detection process alters photon statistics. Harnessing the spectral correlations also permits refinement of the emission and unraveling of previously hidden strong correlations in a plethora of quantum-optical systems under continuous-wave excitation. In this work, we investigate such correlations for time-dependent excitation and develop a methodology to compute efficiently time-integrated correlations, which are at the heart of the photon-counting theory, and subsequently apply it to analyze the photon emission of pulsed systems. By combining this formalism with the —which facilitates frequency-resolved correlations—we demonstrate how spectral filtering enhances single-photon purity and suppresses multiphoton noise in time-bin-encoded quantum states. Specifically, filtering the central spectral peak of a dynamically driven two-level system boosts temporal coherence and improves the fidelity of time-bin entanglement preparation, even under conditions favoring multiphoton emission. These results establish spectral filtering as a critical tool for tailoring photon statistics in pulsed quantum light sources.","lang":"eng"}],"status":"public","_id":"62859","user_id":"48188","department":[{"_id":"623"},{"_id":"15"},{"_id":"429"},{"_id":"642"}],"article_number":"033296","language":[{"iso":"eng"}]},{"year":"2025","citation":{"short":"N.A. Güsken, (2025).","bibtex":"@article{Güsken_2025, title={Beam steering device and electronic apparatus including the same}, author={Güsken, Nicholas Alexander}, year={2025} }","mla":"Güsken, Nicholas Alexander. Beam Steering Device and Electronic Apparatus Including the Same. 2025.","apa":"Güsken, N. A. (2025). Beam steering device and electronic apparatus including the same.","ieee":"N. A. Güsken, “Beam steering device and electronic apparatus including the same.” 2025.","chicago":"Güsken, Nicholas Alexander. “Beam Steering Device and Electronic Apparatus Including the Same,” 2025.","ama":"Güsken NA. Beam steering device and electronic apparatus including the same. Published online 2025."},"date_updated":"2025-12-11T20:46:30Z","ipc":"US20250172751A1","date_created":"2025-12-11T20:43:18Z","author":[{"first_name":"Nicholas Alexander","orcid":"0000-0002-4816-0666","last_name":"Güsken","full_name":"Güsken, Nicholas Alexander","id":"112030"}],"ipn":"18957248","title":"Beam steering device and electronic apparatus including the same","application_number":"18957248","type":"patent","status":"public","publication_date":"2025/05/29","_id":"63050","user_id":"112030","department":[{"_id":"623"},{"_id":"15"},{"_id":"230"}]},{"user_id":"49683","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"project":[{"_id":"171","name":"TRR 142; TP C07: Hohlraum-verstärkte Parametrische Fluoreszenz mit zeitlicher Filterung unter Verwendung integrierter supraleitender Detektoren"}],"_id":"62269","article_type":"original","article_number":"50451","type":"journal_article","status":"public","author":[{"first_name":"Nina Amelie","full_name":"Lange, Nina Amelie","id":"56843","orcid":"0000-0001-6624-7098","last_name":"Lange"},{"last_name":"Lengeling","full_name":"Lengeling, Sebastian","id":"44373","first_name":"Sebastian"},{"orcid":"0000-0003-0643-7636","last_name":"Mues","id":"49772","full_name":"Mues, Philipp","first_name":"Philipp"},{"first_name":"Viktor","last_name":"Quiring","full_name":"Quiring, Viktor"},{"first_name":"Werner","id":"63574","full_name":"Ridder, Werner","last_name":"Ridder"},{"full_name":"Eigner, Christof","id":"13244","last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083","first_name":"Christof"},{"id":"216","full_name":"Herrmann, Harald","last_name":"Herrmann","first_name":"Harald"},{"last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263","first_name":"Christine"},{"last_name":"Bartley","id":"49683","full_name":"Bartley, Tim","first_name":"Tim"}],"volume":33,"date_updated":"2025-12-12T12:13:45Z","oa":"1","main_file_link":[{"open_access":"1"}],"doi":"10.1364/oe.578108","publication_status":"published","publication_identifier":{"issn":["1094-4087"]},"citation":{"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","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.","short":"N.A. Lange, S. Lengeling, P. Mues, V. Quiring, W. Ridder, C. Eigner, H. Herrmann, C. Silberhorn, T. Bartley, Optics Express 33 (2025).","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.","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."},"intvolume":" 33","language":[{"iso":"eng"}],"publication":"Optics Express","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."}],"date_created":"2025-11-20T10:35:35Z","publisher":"Optica Publishing Group","title":"Widely non-degenerate nonlinear frequency conversion in cryogenic titanium in-diffused lithium niobate waveguides","issue":"24","year":"2025"},{"publication":"New Journal of Physics","type":"journal_article","status":"public","_id":"60466","project":[{"_id":"171","name":"TRR 142; TP C07: Hohlraum-verstärkte Parametrische Fluoreszenz mit zeitlicher Filterung unter Verwendung integrierter supraleitender Detektoren"}],"department":[{"_id":"15"},{"_id":"623"}],"user_id":"56843","language":[{"iso":"eng"}],"year":"2025","citation":{"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","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.","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","short":"J. Brockmeier, T. Schapeler, N.A. Lange, J.P. Höpker, H. Herrmann, C. Silberhorn, T. Bartley, New Journal of Physics (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.","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} }"},"oa":"1","date_updated":"2025-12-15T09:21:29Z","date_created":"2025-06-30T08:58:37Z","author":[{"first_name":"Julian","id":"44807","full_name":"Brockmeier, Julian","last_name":"Brockmeier"},{"first_name":"Timon","id":"55629","full_name":"Schapeler, Timon","orcid":"0000-0001-7652-1716","last_name":"Schapeler"},{"first_name":"Nina Amelie","last_name":"Lange","orcid":"0000-0001-6624-7098","full_name":"Lange, Nina Amelie","id":"56843"},{"first_name":"Jan Philipp","last_name":"Höpker","id":"33913","full_name":"Höpker, Jan Philipp"},{"full_name":"Herrmann, Harald","id":"216","last_name":"Herrmann","first_name":"Harald"},{"first_name":"Christine","last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263"},{"full_name":"Bartley, Tim","id":"49683","last_name":"Bartley","first_name":"Tim"}],"title":"Harnessing temporal dispersion for integrated pump filtering in spontaneous heralded single-photon generation processes","doi":"10.1088/1367-2630/ade46c","main_file_link":[{"open_access":"1"}]},{"publication":"Physical Review B","language":[{"iso":"eng"}],"issue":"24","year":"2025","date_created":"2025-12-16T15:50:42Z","publisher":"American Physical Society (APS)","title":"Microscopic approach to the quantized light-matter interaction in semiconductor nanostructures: Complex coupled dynamics of excitons, biexcitons, and photons","type":"journal_article","status":"public","user_id":"16199","department":[{"_id":"15"},{"_id":"170"},{"_id":"293"},{"_id":"297"},{"_id":"623"},{"_id":"429"},{"_id":"230"},{"_id":"35"},{"_id":"27"}],"project":[{"name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"},{"name":"TRR 142 - Project Area A","_id":"54"},{"_id":"59","name":"TRR 142; TP A02: Nichtlineare Spektroskopie von Halbleiter-Nanostrukturen mit Quantenlicht"},{"_id":"445","name":"Hochleistungsrechner Noctua in Paderborn"},{"name":"Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"},{"name":"PhoQC: Photonisches Quantencomputing","_id":"266"}],"_id":"63160","article_number":"245304","publication_status":"published","publication_identifier":{"issn":["2469-9950","2469-9969"]},"citation":{"bibtex":"@article{Rose_Schumacher_Meier_2025, title={Microscopic approach to the quantized light-matter interaction in semiconductor nanostructures: Complex coupled dynamics of excitons, biexcitons, and photons}, volume={112}, DOI={10.1103/528f-7smh}, number={24245304}, journal={Physical Review B}, publisher={American Physical Society (APS)}, author={Rose, Hendrik and Schumacher, Stefan and Meier, Torsten}, year={2025} }","mla":"Rose, Hendrik, et al. “Microscopic Approach to the Quantized Light-Matter Interaction in Semiconductor Nanostructures: Complex Coupled Dynamics of Excitons, Biexcitons, and Photons.” Physical Review B, vol. 112, no. 24, 245304, American Physical Society (APS), 2025, doi:10.1103/528f-7smh.","short":"H. Rose, S. Schumacher, T. Meier, Physical Review B 112 (2025).","apa":"Rose, H., Schumacher, S., & Meier, T. (2025). Microscopic approach to the quantized light-matter interaction in semiconductor nanostructures: Complex coupled dynamics of excitons, biexcitons, and photons. Physical Review B, 112(24), Article 245304. https://doi.org/10.1103/528f-7smh","ama":"Rose H, Schumacher S, Meier T. Microscopic approach to the quantized light-matter interaction in semiconductor nanostructures: Complex coupled dynamics of excitons, biexcitons, and photons. Physical Review B. 2025;112(24). doi:10.1103/528f-7smh","chicago":"Rose, Hendrik, Stefan Schumacher, and Torsten Meier. “Microscopic Approach to the Quantized Light-Matter Interaction in Semiconductor Nanostructures: Complex Coupled Dynamics of Excitons, Biexcitons, and Photons.” Physical Review B 112, no. 24 (2025). https://doi.org/10.1103/528f-7smh.","ieee":"H. Rose, S. Schumacher, and T. Meier, “Microscopic approach to the quantized light-matter interaction in semiconductor nanostructures: Complex coupled dynamics of excitons, biexcitons, and photons,” Physical Review B, vol. 112, no. 24, Art. no. 245304, 2025, doi: 10.1103/528f-7smh."},"intvolume":" 112","author":[{"full_name":"Rose, Hendrik","id":"55958","orcid":"0000-0002-3079-5428","last_name":"Rose","first_name":"Hendrik"},{"orcid":"0000-0003-4042-4951","last_name":"Schumacher","id":"27271","full_name":"Schumacher, Stefan","first_name":"Stefan"},{"orcid":"0000-0001-8864-2072","last_name":"Meier","id":"344","full_name":"Meier, Torsten","first_name":"Torsten"}],"volume":112,"date_updated":"2025-12-16T15:52:55Z","doi":"10.1103/528f-7smh"},{"volume":16,"author":[{"full_name":"Laneve, Alessandro","last_name":"Laneve","first_name":"Alessandro"},{"first_name":"Giuseppe","last_name":"Ronco","full_name":"Ronco, Giuseppe"},{"full_name":"Beccaceci, Mattia","last_name":"Beccaceci","first_name":"Mattia"},{"last_name":"Barigelli","full_name":"Barigelli, Paolo","first_name":"Paolo"},{"first_name":"Francesco","full_name":"Salusti, Francesco","id":"94793","last_name":"Salusti"},{"last_name":"Claro-Rodriguez","full_name":"Claro-Rodriguez, Nicolas","first_name":"Nicolas"},{"first_name":"Giorgio","full_name":"De Pascalis, Giorgio","last_name":"De Pascalis"},{"first_name":"Alessia","last_name":"Suprano","full_name":"Suprano, Alessia"},{"first_name":"Leone","full_name":"Chiaudano, Leone","last_name":"Chiaudano"},{"first_name":"Eva","last_name":"Schöll","full_name":"Schöll, Eva"},{"first_name":"Lukas","full_name":"Hanschke, Lukas","last_name":"Hanschke"},{"full_name":"Krieger, Tobias M.","last_name":"Krieger","first_name":"Tobias M."},{"full_name":"Buchinger, Quirin","last_name":"Buchinger","first_name":"Quirin"},{"full_name":"Covre da Silva, Saimon F.","last_name":"Covre da Silva","first_name":"Saimon F."},{"first_name":"Julia","last_name":"Neuwirth","full_name":"Neuwirth, Julia"},{"first_name":"Sandra","full_name":"Stroj, Sandra","last_name":"Stroj"},{"last_name":"Höfling","full_name":"Höfling, Sven","first_name":"Sven"},{"last_name":"Huber-Loyola","full_name":"Huber-Loyola, Tobias","first_name":"Tobias"},{"first_name":"Mario A.","last_name":"Usuga Castaneda","full_name":"Usuga Castaneda, Mario A."},{"last_name":"Carvacho","full_name":"Carvacho, Gonzalo","first_name":"Gonzalo"},{"first_name":"Nicolò","last_name":"Spagnolo","full_name":"Spagnolo, Nicolò"},{"first_name":"Michele B.","last_name":"Rota","full_name":"Rota, Michele B."},{"full_name":"Basso Basset, Francesco","last_name":"Basso Basset","first_name":"Francesco"},{"first_name":"Armando","last_name":"Rastelli","full_name":"Rastelli, Armando"},{"first_name":"Fabio","full_name":"Sciarrino, Fabio","last_name":"Sciarrino"},{"first_name":"Klaus","id":"85353","full_name":"Jöns, Klaus","last_name":"Jöns"},{"full_name":"Trotta, Rinaldo","last_name":"Trotta","first_name":"Rinaldo"}],"date_created":"2025-12-04T12:20:57Z","publisher":"Springer Science and Business Media LLC","date_updated":"2025-12-17T11:36:14Z","doi":"10.1038/s41467-025-65911-9","title":"Quantum teleportation with dissimilar quantum dots over a hybrid quantum network","issue":"1","publication_identifier":{"issn":["2041-1723"]},"publication_status":"published","intvolume":" 16","citation":{"ama":"Laneve A, Ronco G, Beccaceci M, et al. Quantum teleportation with dissimilar quantum dots over a hybrid quantum network. Nature Communications. 2025;16(1). doi:10.1038/s41467-025-65911-9","ieee":"A. Laneve et al., “Quantum teleportation with dissimilar quantum dots over a hybrid quantum network,” Nature Communications, vol. 16, no. 1, Art. no. 10028, 2025, doi: 10.1038/s41467-025-65911-9.","chicago":"Laneve, Alessandro, Giuseppe Ronco, Mattia Beccaceci, Paolo Barigelli, Francesco Salusti, Nicolas Claro-Rodriguez, Giorgio De Pascalis, et al. “Quantum Teleportation with Dissimilar Quantum Dots over a Hybrid Quantum Network.” Nature Communications 16, no. 1 (2025). https://doi.org/10.1038/s41467-025-65911-9.","mla":"Laneve, Alessandro, et al. “Quantum Teleportation with Dissimilar Quantum Dots over a Hybrid Quantum Network.” Nature Communications, vol. 16, no. 1, 10028, Springer Science and Business Media LLC, 2025, doi:10.1038/s41467-025-65911-9.","bibtex":"@article{Laneve_Ronco_Beccaceci_Barigelli_Salusti_Claro-Rodriguez_De Pascalis_Suprano_Chiaudano_Schöll_et al._2025, title={Quantum teleportation with dissimilar quantum dots over a hybrid quantum network}, volume={16}, DOI={10.1038/s41467-025-65911-9}, number={110028}, journal={Nature Communications}, publisher={Springer Science and Business Media LLC}, author={Laneve, Alessandro and Ronco, Giuseppe and Beccaceci, Mattia and Barigelli, Paolo and Salusti, Francesco and Claro-Rodriguez, Nicolas and De Pascalis, Giorgio and Suprano, Alessia and Chiaudano, Leone and Schöll, Eva and et al.}, year={2025} }","short":"A. Laneve, G. Ronco, M. Beccaceci, P. Barigelli, F. Salusti, N. Claro-Rodriguez, G. De Pascalis, A. Suprano, L. Chiaudano, E. Schöll, L. Hanschke, T.M. Krieger, Q. Buchinger, S.F. Covre da Silva, J. Neuwirth, S. Stroj, S. Höfling, T. Huber-Loyola, M.A. Usuga Castaneda, G. Carvacho, N. Spagnolo, M.B. Rota, F. Basso Basset, A. Rastelli, F. Sciarrino, K. Jöns, R. Trotta, Nature Communications 16 (2025).","apa":"Laneve, A., Ronco, G., Beccaceci, M., Barigelli, P., Salusti, F., Claro-Rodriguez, N., De Pascalis, G., Suprano, A., Chiaudano, L., Schöll, E., Hanschke, L., Krieger, T. M., Buchinger, Q., Covre da Silva, S. F., Neuwirth, J., Stroj, S., Höfling, S., Huber-Loyola, T., Usuga Castaneda, M. A., … Trotta, R. (2025). Quantum teleportation with dissimilar quantum dots over a hybrid quantum network. Nature Communications, 16(1), Article 10028. https://doi.org/10.1038/s41467-025-65911-9"},"year":"2025","department":[{"_id":"623"},{"_id":"15"},{"_id":"429"},{"_id":"642"}],"user_id":"48188","_id":"62861","language":[{"iso":"eng"}],"article_number":"10028","publication":"Nature Communications","type":"journal_article","status":"public"},{"publication":"Optics & Laser Technology","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."}],"language":[{"iso":"eng"}],"quality_controlled":"1","year":"2025","publisher":"Elsevier BV","date_created":"2025-12-18T08:17:57Z","title":"Photorefraction and in-situ optical cleaning in various types of LiNbO3 waveguides","type":"journal_article","status":"public","_id":"63192","user_id":"69553","department":[{"_id":"288"},{"_id":"623"},{"_id":"15"}],"article_type":"original","article_number":"114260","publication_status":"published","publication_identifier":{"issn":["0030-3992"]},"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","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.","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.","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","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).","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} }"},"intvolume":" 193","date_updated":"2025-12-18T08:27:13Z","oa":"1","author":[{"first_name":"Michelle","last_name":"Kirsch","full_name":"Kirsch, Michelle","id":"69553"},{"first_name":"Christian","last_name":"Kießler","full_name":"Kießler, Christian","id":"44252"},{"first_name":"Sebastian","last_name":"Lengeling","id":"44373","full_name":"Lengeling, Sebastian"},{"last_name":"Stefszky","id":"42777","full_name":"Stefszky, Michael","first_name":"Michael"},{"first_name":"Christof","last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083","full_name":"Eigner, Christof","id":"13244"},{"full_name":"Herrmann, Harald","id":"216","last_name":"Herrmann","first_name":"Harald"},{"first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263","last_name":"Silberhorn"}],"volume":193,"main_file_link":[{"open_access":"1","url":"https://www.sciencedirect.com/science/article/pii/S0030399225018511?via%3Dihub"}],"doi":"10.1016/j.optlastec.2025.114260"},{"author":[{"last_name":"Serino","id":"88242","full_name":"Serino, Laura Maria","first_name":"Laura Maria"},{"first_name":"Giovanni","full_name":"Chesi, Giovanni","last_name":"Chesi"},{"first_name":"Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 ","id":"27150","full_name":"Brecht, Benjamin"},{"full_name":"Maccone, Lorenzo","last_name":"Maccone","first_name":"Lorenzo"},{"last_name":"Macchiavello","full_name":"Macchiavello, Chiara","first_name":"Chiara"},{"last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263","first_name":"Christine"}],"date_created":"2025-12-18T16:04:45Z","volume":7,"publisher":"American Physical Society (APS)","date_updated":"2025-12-18T16:05:45Z","doi":"10.1103/v24q-sl6n","title":"Complementarity-based complementarity: The choice of mutually unbiased observables shapes quantum uncertainty relations","issue":"3","publication_status":"published","publication_identifier":{"issn":["2643-1564"]},"citation":{"apa":"Serino, L. M., Chesi, G., Brecht, B., Maccone, L., Macchiavello, C., & Silberhorn, C. (2025). Complementarity-based complementarity: The choice of mutually unbiased observables shapes quantum uncertainty relations. Physical Review Research, 7(3), Article 033152. https://doi.org/10.1103/v24q-sl6n","short":"L.M. Serino, G. Chesi, B. Brecht, L. Maccone, C. Macchiavello, C. Silberhorn, Physical Review Research 7 (2025).","bibtex":"@article{Serino_Chesi_Brecht_Maccone_Macchiavello_Silberhorn_2025, title={Complementarity-based complementarity: The choice of mutually unbiased observables shapes quantum uncertainty relations}, volume={7}, DOI={10.1103/v24q-sl6n}, number={3033152}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Serino, Laura Maria and Chesi, Giovanni and Brecht, Benjamin and Maccone, Lorenzo and Macchiavello, Chiara and Silberhorn, Christine}, year={2025} }","mla":"Serino, Laura Maria, et al. “Complementarity-Based Complementarity: The Choice of Mutually Unbiased Observables Shapes Quantum Uncertainty Relations.” Physical Review Research, vol. 7, no. 3, 033152, American Physical Society (APS), 2025, doi:10.1103/v24q-sl6n.","ama":"Serino LM, Chesi G, Brecht B, Maccone L, Macchiavello C, Silberhorn C. Complementarity-based complementarity: The choice of mutually unbiased observables shapes quantum uncertainty relations. Physical Review Research. 2025;7(3). doi:10.1103/v24q-sl6n","chicago":"Serino, Laura Maria, Giovanni Chesi, Benjamin Brecht, Lorenzo Maccone, Chiara Macchiavello, and Christine Silberhorn. “Complementarity-Based Complementarity: The Choice of Mutually Unbiased Observables Shapes Quantum Uncertainty Relations.” Physical Review Research 7, no. 3 (2025). https://doi.org/10.1103/v24q-sl6n.","ieee":"L. M. Serino, G. Chesi, B. Brecht, L. Maccone, C. Macchiavello, and C. Silberhorn, “Complementarity-based complementarity: The choice of mutually unbiased observables shapes quantum uncertainty relations,” Physical Review Research, vol. 7, no. 3, Art. no. 033152, 2025, doi: 10.1103/v24q-sl6n."},"intvolume":" 7","year":"2025","user_id":"27150","department":[{"_id":"15"},{"_id":"623"}],"_id":"63213","language":[{"iso":"eng"}],"article_type":"original","article_number":"033152","type":"journal_article","publication":"Physical Review Research","status":"public","abstract":[{"text":"Quantum uncertainty relations impose fundamental limits on the joint knowledge that can be acquired from complementary observables: Perfect knowledge of a quantum state in one basis implies maximal indetermination in all other mutually unbiased bases (MUBs). Uncertainty relations derived from joint properties of the MUBs are generally assumed to be uniform, irrespective of the specific observables chosen within a set. In this work, we demonstrate instead that the uncertainty relations can depend on the choice of observables. Through both experimental observation and numerical methods, we show that selecting different sets of three MUBs in a five-dimensional quantum system results in distinct uncertainty bounds, i.e., in varying degrees of complementarity, in terms of both entropy and variance.","lang":"eng"}]},{"publisher":"American Physical Society (APS)","date_updated":"2025-12-18T16:06:34Z","author":[{"last_name":"Horoshko","full_name":"Horoshko, Dmitri B.","first_name":"Dmitri B."},{"last_name":"Srivastava","full_name":"Srivastava, Shivang","first_name":"Shivang"},{"first_name":"Filip","full_name":"Sośnicki, Filip","last_name":"Sośnicki"},{"first_name":"Michał","last_name":"Mikołajczyk","full_name":"Mikołajczyk, Michał"},{"first_name":"Michał","last_name":"Karpiński","full_name":"Karpiński, Michał"},{"first_name":"Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 ","full_name":"Brecht, Benjamin","id":"27150"},{"full_name":"Kolobov, Mikhail I.","last_name":"Kolobov","first_name":"Mikhail I."}],"date_created":"2025-12-18T16:06:13Z","volume":112,"title":"Time-resolved second-order autocorrelation function of parametric down-conversion","doi":"10.1103/7ckm-tm3r","publication_status":"published","publication_identifier":{"issn":["2469-9926","2469-9934"]},"issue":"2","year":"2025","citation":{"bibtex":"@article{Horoshko_Srivastava_Sośnicki_Mikołajczyk_Karpiński_Brecht_Kolobov_2025, title={Time-resolved second-order autocorrelation function of parametric down-conversion}, volume={112}, DOI={10.1103/7ckm-tm3r}, number={2023703}, journal={Physical Review A}, publisher={American Physical Society (APS)}, author={Horoshko, Dmitri B. and Srivastava, Shivang and Sośnicki, Filip and Mikołajczyk, Michał and Karpiński, Michał and Brecht, Benjamin and Kolobov, Mikhail I.}, year={2025} }","short":"D.B. Horoshko, S. Srivastava, F. Sośnicki, M. Mikołajczyk, M. Karpiński, B. Brecht, M.I. Kolobov, Physical Review A 112 (2025).","mla":"Horoshko, Dmitri B., et al. “Time-Resolved Second-Order Autocorrelation Function of Parametric down-Conversion.” Physical Review A, vol. 112, no. 2, 023703, American Physical Society (APS), 2025, doi:10.1103/7ckm-tm3r.","apa":"Horoshko, D. B., Srivastava, S., Sośnicki, F., Mikołajczyk, M., Karpiński, M., Brecht, B., & Kolobov, M. I. (2025). Time-resolved second-order autocorrelation function of parametric down-conversion. Physical Review A, 112(2), Article 023703. https://doi.org/10.1103/7ckm-tm3r","ieee":"D. B. Horoshko et al., “Time-resolved second-order autocorrelation function of parametric down-conversion,” Physical Review A, vol. 112, no. 2, Art. no. 023703, 2025, doi: 10.1103/7ckm-tm3r.","chicago":"Horoshko, Dmitri B., Shivang Srivastava, Filip Sośnicki, Michał Mikołajczyk, Michał Karpiński, Benjamin Brecht, and Mikhail I. Kolobov. “Time-Resolved Second-Order Autocorrelation Function of Parametric down-Conversion.” Physical Review A 112, no. 2 (2025). https://doi.org/10.1103/7ckm-tm3r.","ama":"Horoshko DB, Srivastava S, Sośnicki F, et al. Time-resolved second-order autocorrelation function of parametric down-conversion. Physical Review A. 2025;112(2). doi:10.1103/7ckm-tm3r"},"intvolume":" 112","_id":"63214","user_id":"27150","department":[{"_id":"15"},{"_id":"623"}],"article_number":"023703","language":[{"iso":"eng"}],"type":"journal_article","publication":"Physical Review A","abstract":[{"lang":"eng","text":"We study a possibility of measuring the time-resolved second-order autocorrelation function of one of two beams generated in type-II parametric down-conversion by means of temporal magnification of this beam, bringing its correlation time from the picosecond to the nanosecond scale, which can be resolved by modern photodetectors. We show that such a measurement enables one to infer directly the degree of global coherence of that beam, which is linked by a simple relation to the number of modes characterizing the entanglement between the two generated beams. We illustrate the proposed method by an example of photon pairs generated in a periodically poled potassium titanyl phosphate (KTP) crystal with a symmetric group velocity matching for various durations of the pump pulse, resulting in different numbers of modes. Our theoretical model also shows that the magnified double-heralded autocorrelation function of one beam exhibits a local maximum around zero delay time, corresponding to photon bunching at a short time scale."}],"status":"public"},{"intvolume":" 10","citation":{"apa":"Serino, L. M., Rambach, M., Brecht, B., Romero, J., & Silberhorn, C. (2025). Self-guided tomography of time-frequency qudits. Quantum Science and Technology, 10(2), Article 025024. https://doi.org/10.1088/2058-9565/adb0ea","short":"L.M. Serino, M. Rambach, B. Brecht, J. Romero, C. Silberhorn, Quantum Science and Technology 10 (2025).","mla":"Serino, Laura Maria, et al. “Self-Guided Tomography of Time-Frequency Qudits.” Quantum Science and Technology, vol. 10, no. 2, 025024, IOP Publishing, 2025, doi:10.1088/2058-9565/adb0ea.","bibtex":"@article{Serino_Rambach_Brecht_Romero_Silberhorn_2025, title={Self-guided tomography of time-frequency qudits}, volume={10}, DOI={10.1088/2058-9565/adb0ea}, number={2025024}, journal={Quantum Science and Technology}, publisher={IOP Publishing}, author={Serino, Laura Maria and Rambach, Markus and Brecht, Benjamin and Romero, Jacquiline and Silberhorn, Christine}, year={2025} }","ieee":"L. M. Serino, M. Rambach, B. Brecht, J. Romero, and C. Silberhorn, “Self-guided tomography of time-frequency qudits,” Quantum Science and Technology, vol. 10, no. 2, Art. no. 025024, 2025, doi: 10.1088/2058-9565/adb0ea.","chicago":"Serino, Laura Maria, Markus Rambach, Benjamin Brecht, Jacquiline Romero, and Christine Silberhorn. “Self-Guided Tomography of Time-Frequency Qudits.” Quantum Science and Technology 10, no. 2 (2025). https://doi.org/10.1088/2058-9565/adb0ea.","ama":"Serino LM, Rambach M, Brecht B, Romero J, Silberhorn C. Self-guided tomography of time-frequency qudits. Quantum Science and Technology. 2025;10(2). doi:10.1088/2058-9565/adb0ea"},"year":"2025","issue":"2","publication_identifier":{"issn":["2058-9565"]},"publication_status":"published","doi":"10.1088/2058-9565/adb0ea","title":"Self-guided tomography of time-frequency qudits","volume":10,"date_created":"2025-12-18T16:07:11Z","author":[{"last_name":"Serino","id":"88242","full_name":"Serino, Laura Maria","first_name":"Laura Maria"},{"first_name":"Markus","last_name":"Rambach","full_name":"Rambach, Markus"},{"last_name":"Brecht","orcid":"0000-0003-4140-0556 ","full_name":"Brecht, Benjamin","id":"27150","first_name":"Benjamin"},{"full_name":"Romero, Jacquiline","last_name":"Romero","first_name":"Jacquiline"},{"first_name":"Christine","id":"26263","full_name":"Silberhorn, Christine","last_name":"Silberhorn"}],"publisher":"IOP Publishing","date_updated":"2025-12-18T16:07:35Z","status":"public","abstract":[{"text":"Abstract\r\n High-dimensional time-frequency encodings have the potential to significantly advance quantum information science; however, practical applications require precise knowledge of the encoded quantum states, which becomes increasingly challenging for larger Hilbert spaces. Self-guided tomography (SGT) has emerged as a practical and scalable technique for this purpose in the spatial domain. Here, we apply SGT to estimate time-frequency states using a multi-output quantum pulse gate. We achieve fidelities of more than 99% for 3- and 5-dimensional states without the need for calibration or post-processing. We demonstrate the robustness of SGT against statistical and environmental noise, highlighting its efficacy in the photon-starved regime typical of quantum information applications.","lang":"eng"}],"publication":"Quantum Science and Technology","type":"journal_article","language":[{"iso":"eng"}],"article_number":"025024","department":[{"_id":"15"},{"_id":"623"}],"user_id":"27150","_id":"63215"},{"year":"2025","issue":"25","title":"Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths","date_created":"2025-12-15T07:20:36Z","publisher":"Optica Publishing Group","abstract":[{"lang":"eng","text":"We present the design and characterization of a guided-wave, bright, and highly frequency non-degenerate parametric down-conversion (PDC) source in thin-film lithium niobate. The source generates photon pairs with wavelengths of 815 nm and 1550 nm, linking the visible wavelength regime with telecommunication wavelengths. We confirm the high quality of the generated single photons by determining a value for the heralded second-order correlation function as low as g_h^(2)=(6.7+/-1.1)*10^8-3). Furthermore, we achieve a high spectral brightness of 0.44·10pairs/(smWGHz) which is two orders of magnitude higher than sources based on weakly guiding waveguides. The shape of the PDC spectrum and the strong agreement between the effective and nominal bandwidth highlight our high fabrication quality of periodically poled waveguides. The good agreement between the measured and simulated spectral characteristics of our source demonstrates our excellent understanding of the PDC process. Our result is a valuable step towards practical and scalable quantum communication networks as well as photonic quantum computing."}],"publication":"Optics Express","language":[{"iso":"eng"}],"citation":{"apa":"Babel, S., Bollmers, L., Roeder, F., Ridder, W., Golla, C., Köthemann, R., Reineke, B., Herrmann, H., Brecht, B., Eigner, C., Padberg, L., & Silberhorn, C. (2025). Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths. Optics Express, 33(25), Article 52729. https://doi.org/10.1364/oe.571605","bibtex":"@article{Babel_Bollmers_Roeder_Ridder_Golla_Köthemann_Reineke_Herrmann_Brecht_Eigner_et al._2025, title={Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths}, volume={33}, DOI={10.1364/oe.571605}, number={2552729}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Babel, Silia and Bollmers, Laura and Roeder, Franz and Ridder, Werner and Golla, Christian and Köthemann, Ronja and Reineke, Bernhard and Herrmann, Harald and Brecht, Benjamin and Eigner, Christof and et al.}, year={2025} }","short":"S. Babel, L. Bollmers, F. Roeder, W. Ridder, C. Golla, R. Köthemann, B. Reineke, H. Herrmann, B. Brecht, C. Eigner, L. Padberg, C. Silberhorn, Optics Express 33 (2025).","mla":"Babel, Silia, et al. “Ultrabright, Two-Color Photon Pair Source Based on Thin-Film Lithium Niobate for Bridging Visible and Telecom Wavelengths.” Optics Express, vol. 33, no. 25, 52729, Optica Publishing Group, 2025, doi:10.1364/oe.571605.","chicago":"Babel, Silia, Laura Bollmers, Franz Roeder, Werner Ridder, Christian Golla, Ronja Köthemann, Bernhard Reineke, et al. “Ultrabright, Two-Color Photon Pair Source Based on Thin-Film Lithium Niobate for Bridging Visible and Telecom Wavelengths.” Optics Express 33, no. 25 (2025). https://doi.org/10.1364/oe.571605.","ieee":"S. Babel et al., “Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths,” Optics Express, vol. 33, no. 25, Art. no. 52729, 2025, doi: 10.1364/oe.571605.","ama":"Babel S, Bollmers L, Roeder F, et al. Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths. Optics Express. 2025;33(25). doi:10.1364/oe.571605"},"intvolume":" 33","publication_status":"published","publication_identifier":{"issn":["1094-4087"]},"main_file_link":[{"url":"https://opg.optica.org/oe/fulltext.cfm?uri=oe-33-25-52729","open_access":"1"}],"doi":"10.1364/oe.571605","author":[{"orcid":"https://orcid.org/0000-0002-1568-2580","last_name":"Babel","id":"63231","full_name":"Babel, Silia","first_name":"Silia"},{"last_name":"Bollmers","id":"61375","full_name":"Bollmers, Laura","first_name":"Laura"},{"id":"88149","full_name":"Roeder, Franz","last_name":"Roeder","first_name":"Franz"},{"first_name":"Werner","last_name":"Ridder","id":"63574","full_name":"Ridder, Werner"},{"first_name":"Christian","last_name":"Golla","full_name":"Golla, Christian","id":"40420"},{"first_name":"Ronja","full_name":"Köthemann, Ronja","last_name":"Köthemann"},{"first_name":"Bernhard","last_name":"Reineke","id":"29821","full_name":"Reineke, Bernhard"},{"first_name":"Harald","last_name":"Herrmann","id":"216","full_name":"Herrmann, Harald"},{"orcid":"0000-0003-4140-0556 ","last_name":"Brecht","full_name":"Brecht, Benjamin","id":"27150","first_name":"Benjamin"},{"first_name":"Christof","last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083","id":"13244","full_name":"Eigner, Christof"},{"id":"40300","full_name":"Padberg, Laura","last_name":"Padberg","first_name":"Laura"},{"full_name":"Silberhorn, Christine","id":"26263","last_name":"Silberhorn","first_name":"Christine"}],"volume":33,"oa":"1","date_updated":"2026-01-07T11:28:35Z","status":"public","type":"journal_article","article_number":"52729","article_type":"original","user_id":"63231","department":[{"_id":"288"},{"_id":"623"}],"_id":"63091"},{"abstract":[{"text":"Periodically poled thin-film lithium niobate (TFLN) crystals are the fundamental building block for highly-efficient quantum light sources and frequency converters. The efficiency of these devices is strongly dependent on the interaction length between the light and the nonlinear material, scaling quadratically with this parameter. Nevertheless, the fabrication of long, continuously poled areas in TFLN remains challenging, the length of continuously poled areas rarely exceeds 10 mm. In this work, we demonstrate a significant progress in this field achieving the periodic poling of continuous poled areas of 70 mm length with a 3 μm poling period and a close to 50 % duty cycle. We compare two poling electrode design approaches to fabricate long, continuous poled areas. The first approach involves the poling of a single, continuous 70 mm long electrode. The second utilize a segmented approach including the poling of more than 20 individual sections forming together a 70 mm long poling area with no stitching errors. While the continuous electrode allows for faster fabrication, the segmented approach allows to individually optimize the poling resulting in less duty cycle variation. A detailed analysis of the periodic poling results reveals that the results of both are consistent with previously reported poling outcomes for shorter devices. Thus, we demonstrate wafer-scale periodic poling exceeding chiplet-size without any loss in the periodic poling quality. Our work presents a key step towards highly-efficient, narrow-bandwidth and low-pump power nonlinear optical devices.","lang":"eng"}],"publication":"Nanophotonics","language":[{"iso":"eng"}],"year":"2025","quality_controlled":"1","title":"Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate","publisher":"Walter de Gruyter GmbH","date_created":"2025-12-01T08:45:07Z","status":"public","type":"journal_article","article_type":"original","_id":"62713","user_id":"22501","department":[{"_id":"15"},{"_id":"288"},{"_id":"623"}],"citation":{"ieee":"L. Bollmers, N. Spiegelberg, M. Rüsing, C. Eigner, L. Padberg, and C. Silberhorn, “Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate,” Nanophotonics, vol. 14, p. 4761, 2025, doi: 10.1515/nanoph-2025-0461.","chicago":"Bollmers, Laura, Noah Spiegelberg, Michael Rüsing, Christof Eigner, Laura Padberg, and Christine Silberhorn. “Segmented Finger Electrodes to Optimize Ultra-Long Continuous Wafer-Scale Periodic Poling in Thin-Film Lithium Niobate.” Nanophotonics 14 (2025): 4761. https://doi.org/10.1515/nanoph-2025-0461.","ama":"Bollmers L, Spiegelberg N, Rüsing M, Eigner C, Padberg L, Silberhorn C. Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate. Nanophotonics. 2025;14:4761. doi:10.1515/nanoph-2025-0461","bibtex":"@article{Bollmers_Spiegelberg_Rüsing_Eigner_Padberg_Silberhorn_2025, title={Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate}, volume={14}, DOI={10.1515/nanoph-2025-0461}, journal={Nanophotonics}, publisher={Walter de Gruyter GmbH}, author={Bollmers, Laura and Spiegelberg, Noah and Rüsing, Michael and Eigner, Christof and Padberg, Laura and Silberhorn, Christine}, year={2025}, pages={4761} }","short":"L. Bollmers, N. Spiegelberg, M. Rüsing, C. Eigner, L. Padberg, C. Silberhorn, Nanophotonics 14 (2025) 4761.","mla":"Bollmers, Laura, et al. “Segmented Finger Electrodes to Optimize Ultra-Long Continuous Wafer-Scale Periodic Poling in Thin-Film Lithium Niobate.” Nanophotonics, vol. 14, Walter de Gruyter GmbH, 2025, p. 4761, doi:10.1515/nanoph-2025-0461.","apa":"Bollmers, L., Spiegelberg, N., Rüsing, M., Eigner, C., Padberg, L., & Silberhorn, C. (2025). Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate. Nanophotonics, 14, 4761. https://doi.org/10.1515/nanoph-2025-0461"},"page":"4761","intvolume":" 14","publication_status":"published","publication_identifier":{"issn":["2192-8606","2192-8614"]},"main_file_link":[{"url":"https://doi.org/10.1515/nanoph-2025-0461","open_access":"1"}],"doi":"10.1515/nanoph-2025-0461","oa":"1","date_updated":"2026-01-07T12:06:29Z","author":[{"first_name":"Laura","full_name":"Bollmers, Laura","id":"61375","last_name":"Bollmers"},{"full_name":"Spiegelberg, Noah","last_name":"Spiegelberg","first_name":"Noah"},{"first_name":"Michael","full_name":"Rüsing, Michael","id":"22501","orcid":"0000-0003-4682-4577","last_name":"Rüsing"},{"first_name":"Christof","full_name":"Eigner, Christof","id":"13244","orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner"},{"full_name":"Padberg, Laura","id":"40300","last_name":"Padberg","first_name":"Laura"},{"last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263","first_name":"Christine"}],"volume":14},{"date_updated":"2026-01-08T13:23:44Z","ipc":"US20250116889A1","author":[{"orcid":"0000-0002-4816-0666","last_name":"Güsken","id":"112030","full_name":"Güsken, Nicholas Alexander","first_name":"Nicholas Alexander"}],"date_created":"2025-12-11T20:45:34Z","title":"Optical modulator and electronic apparatus including the same","ipn":"US20250116889A1","year":"2025","citation":{"ama":"Güsken NA. Optical modulator and electronic apparatus including the same. Published online 2025.","ieee":"N. A. Güsken, “Optical modulator and electronic apparatus including the same.” 2025.","chicago":"Güsken, Nicholas Alexander. “Optical Modulator and Electronic Apparatus Including the Same,” 2025.","apa":"Güsken, N. A. (2025). Optical modulator and electronic apparatus including the same.","short":"N.A. Güsken, (2025).","mla":"Güsken, Nicholas Alexander. Optical Modulator and Electronic Apparatus Including the Same. 2025.","bibtex":"@article{Güsken_2025, title={Optical modulator and electronic apparatus including the same}, author={Güsken, Nicholas Alexander}, year={2025} }"},"publication_date":"2025/04/^0","_id":"63051","user_id":"112030","department":[{"_id":"623"},{"_id":"15"},{"_id":"230"}],"type":"patent","status":"public"}]