[{"volume":288,"author":[{"full_name":"Weich, Tobias","id":"49178","orcid":"0000-0002-9648-6919","last_name":"Weich","first_name":"Tobias"},{"full_name":"Budde, Julia","last_name":"Budde","first_name":"Julia"}],"date_updated":"2024-09-25T08:18:44Z","oa":"1","doi":" https://doi.org/10.1016/j.jfa.2024.110684","has_accepted_license":"1","intvolume":"       288","citation":{"short":"T. Weich, J. Budde, Journal of Functional Analysis 288 (2025).","bibtex":"@article{Weich_Budde_2025, title={Wave Front Sets of Nilpotent Lie Group Representations}, volume={288}, DOI={<a href=\"https://doi.org/ https://doi.org/10.1016/j.jfa.2024.110684\"> https://doi.org/10.1016/j.jfa.2024.110684</a>}, number={1}, journal={Journal of Functional Analysis}, author={Weich, Tobias and Budde, Julia}, year={2025} }","mla":"Weich, Tobias, and Julia Budde. “Wave Front Sets of Nilpotent Lie Group Representations.” <i>Journal of Functional Analysis</i>, vol. 288, no. 1, 2025, doi:<a href=\"https://doi.org/ https://doi.org/10.1016/j.jfa.2024.110684\"> https://doi.org/10.1016/j.jfa.2024.110684</a>.","apa":"Weich, T., &#38; Budde, J. (2025). Wave Front Sets of Nilpotent Lie Group Representations. <i>Journal of Functional Analysis</i>, <i>288</i>(1). <a href=\"https://doi.org/ https://doi.org/10.1016/j.jfa.2024.110684\">https://doi.org/ https://doi.org/10.1016/j.jfa.2024.110684</a>","chicago":"Weich, Tobias, and Julia Budde. “Wave Front Sets of Nilpotent Lie Group Representations.” <i>Journal of Functional Analysis</i> 288, no. 1 (2025). <a href=\"https://doi.org/ https://doi.org/10.1016/j.jfa.2024.110684\">https://doi.org/ https://doi.org/10.1016/j.jfa.2024.110684</a>.","ieee":"T. Weich and J. Budde, “Wave Front Sets of Nilpotent Lie Group Representations,” <i>Journal of Functional Analysis</i>, vol. 288, no. 1, 2025, doi: <a href=\"https://doi.org/ https://doi.org/10.1016/j.jfa.2024.110684\"> https://doi.org/10.1016/j.jfa.2024.110684</a>.","ama":"Weich T, Budde J. Wave Front Sets of Nilpotent Lie Group Representations. <i>Journal of Functional Analysis</i>. 2025;288(1). doi:<a href=\"https://doi.org/ https://doi.org/10.1016/j.jfa.2024.110684\"> https://doi.org/10.1016/j.jfa.2024.110684</a>"},"department":[{"_id":"10"},{"_id":"623"},{"_id":"548"}],"user_id":"49178","_id":"32099","project":[{"_id":"356","name":"TRR 358 - B02: TRR 358 - Spektraltheorie in höherem Rang und unendlichem Volumen (Teilprojekt B02)","grant_number":"491392403"},{"name":"Mikrolokale Methoden für hyperbolische Dynamiken","_id":"355","grant_number":"422642921"}],"file_date_updated":"2022-06-22T09:56:39Z","type":"journal_article","status":"public","date_created":"2022-06-22T09:56:43Z","title":"Wave Front Sets of Nilpotent Lie Group Representations","issue":"1","year":"2025","language":[{"iso":"eng"}],"ddc":["510"],"publication":"Journal of Functional Analysis","file":[{"content_type":"application/pdf","relation":"main_file","creator":"weich","date_created":"2022-06-22T09:56:39Z","date_updated":"2022-06-22T09:56:39Z","access_level":"open_access","file_name":"2103.02968.pdf","file_id":"32100","file_size":978990}]},{"year":"2025","citation":{"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 <i>Proceedings of The 15th International Conference on Metamaterials, Photonic Crystals and Plasmonics</i>, 2025.","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.","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: <i>Proceedings of The 15th International Conference on Metamaterials, Photonic Crystals and Plasmonics</i>. ; 2025.","apa":"Brauckmann, M., Narvaez Castaneda, E., Siebert, D., Brecht, B., Förstner, J., &#38; Zentgraf, T. (2025). Enhancement Of Light-matter Interaction In Topological Waveguides And Resonators. <i>Proceedings of The 15th International Conference on Metamaterials, Photonic Crystals and Plasmonics</i>. META 2025 - The 15th International Conference on Metamaterials, Photonic Crystals and Plasmonics, Malaga, Spain.","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.","mla":"Brauckmann, Michael, et al. “Enhancement Of Light-Matter Interaction In Topological Waveguides And Resonators.” <i>Proceedings of The 15th International Conference on Metamaterials, Photonic Crystals and Plasmonics</i>, 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} }"},"title":"Enhancement Of Light-matter Interaction In Topological Waveguides And Resonators","conference":{"end_date":"2025-07-25","location":"Malaga, Spain","name":"META 2025 - The 15th International Conference on Metamaterials, Photonic Crystals and Plasmonics","start_date":"2025-07-22"},"date_updated":"2025-05-23T06:11:20Z","date_created":"2025-05-23T06:10:53Z","author":[{"full_name":"Brauckmann, Michael","last_name":"Brauckmann","first_name":"Michael"},{"last_name":"Narvaez Castaneda","full_name":"Narvaez Castaneda, Emmanuel","first_name":"Emmanuel"},{"last_name":"Siebert","full_name":"Siebert, Dustin","first_name":"Dustin"},{"first_name":"Benjamin","full_name":"Brecht, Benjamin","id":"27150","orcid":"0000-0003-4140-0556 ","last_name":"Brecht"},{"orcid":"0000-0001-7059-9862","last_name":"Förstner","full_name":"Förstner, Jens","id":"158","first_name":"Jens"},{"first_name":"Thomas","full_name":"Zentgraf, Thomas","id":"30525","last_name":"Zentgraf","orcid":"0000-0002-8662-1101"}],"status":"public","type":"conference","publication":"Proceedings of The 15th International Conference on Metamaterials, Photonic Crystals and Plasmonics","language":[{"iso":"eng"}],"project":[{"_id":"53","name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","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*)"}],"_id":"60022","user_id":"30525","department":[{"_id":"15"},{"_id":"230"},{"_id":"289"},{"_id":"623"}]},{"editor":[{"first_name":"Fumio","last_name":"Hiroshima","full_name":"Hiroshima, Fumio"}],"status":"public","type":"conference","project":[{"name":"PhoQC: PhoQC: Photonisches Quantencomputing","_id":"266"}],"_id":"47534","user_id":"99427","series_title":"RIMS Kôkyûroku","department":[{"_id":"799"},{"_id":"623"}],"citation":{"ama":"Hinrichs B, Matte O. Feynman-Kac formula for fiber Hamiltonians in the relativistic Nelson  model in two spatial dimensions. In: Hiroshima F, ed. <i>Proceedings of the 2023 RIMS Workshop “Mathematical Aspects of Quantum Fields and Related Topics.”</i> Vol 2310. RIMS Kôkyûroku. ; 2025.","chicago":"Hinrichs, Benjamin, and Oliver Matte. “Feynman-Kac Formula for Fiber Hamiltonians in the Relativistic Nelson  Model in Two Spatial Dimensions.” In <i>Proceedings of the 2023 RIMS Workshop “Mathematical Aspects of Quantum Fields and Related Topics,”</i> edited by Fumio Hiroshima, 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 <i>Proceedings of the 2023 RIMS Workshop “Mathematical Aspects of Quantum Fields and Related Topics,”</i> 2025, vol. 2310, no. 3.","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} }","mla":"Hinrichs, Benjamin, and Oliver Matte. “Feynman-Kac Formula for Fiber Hamiltonians in the Relativistic Nelson  Model in Two Spatial Dimensions.” <i>Proceedings of the 2023 RIMS Workshop “Mathematical Aspects of Quantum Fields and Related Topics,”</i> edited by Fumio Hiroshima, vol. 2310, no. 3, 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.","apa":"Hinrichs, B., &#38; Matte, O. (2025). Feynman-Kac formula for fiber Hamiltonians in the relativistic Nelson  model in two spatial dimensions. In F. Hiroshima (Ed.), <i>Proceedings of the 2023 RIMS Workshop “Mathematical Aspects of Quantum Fields and Related Topics”</i> (Vol. 2310, Issue 3)."},"intvolume":"      2310","main_file_link":[{"url":"https://www.kurims.kyoto-u.ac.jp/~kyodo/kokyuroku/contents/2310.html"}],"date_updated":"2026-01-16T08:55:19Z","author":[{"orcid":"0000-0001-9074-1205","last_name":"Hinrichs","full_name":"Hinrichs, Benjamin","id":"99427","first_name":"Benjamin"},{"first_name":"Oliver","full_name":"Matte, Oliver","last_name":"Matte"}],"volume":2310,"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."}],"publication":"Proceedings of the 2023 RIMS Workshop 'Mathematical Aspects of Quantum Fields and Related Topics'","language":[{"iso":"eng"}],"external_id":{"arxiv":["2309.09005"]},"year":"2025","issue":"3","title":"Feynman-Kac formula for fiber Hamiltonians in the relativistic Nelson  model in two spatial dimensions","date_created":"2023-10-02T06:21:37Z"},{"language":[{"iso":"eng"}],"project":[{"_id":"191","name":"PhoQuant: Photonische Quantencomputer -  Quantencomputing Testplattform"}],"external_id":{"arxiv":["2509.10183"]},"_id":"63107","user_id":"41047","department":[{"_id":"34"},{"_id":"64"},{"_id":"623"}],"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"}],"status":"public","type":"preprint","publication":"arXiv:2509.10183","title":"Symplectic Lattices and GKP Codes -- Simple Randomized Constructions from Cryptographic Lattices","date_updated":"2026-01-23T09:59:34Z","author":[{"first_name":"Johannes","last_name":"Blömer","full_name":"Blömer, Johannes"},{"first_name":"Yinzi","last_name":"Xiao","full_name":"Xiao, Yinzi"},{"first_name":"Zahra","last_name":"Raissi","full_name":"Raissi, Zahra"},{"first_name":"Stanislaw","full_name":"Soltan, Stanislaw","last_name":"Soltan"}],"date_created":"2025-12-15T15:34:08Z","year":"2025","citation":{"short":"J. Blömer, Y. Xiao, Z. Raissi, S. Soltan, ArXiv:2509.10183 (2025).","mla":"Blömer, Johannes, et al. “Symplectic Lattices and GKP Codes -- Simple Randomized Constructions from Cryptographic Lattices.” <i>ArXiv:2509.10183</i>, 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., &#38; Soltan, S. (2025). Symplectic Lattices and GKP Codes -- Simple Randomized Constructions from Cryptographic Lattices. In <i>arXiv:2509.10183</i>.","ieee":"J. Blömer, Y. Xiao, Z. Raissi, and S. Soltan, “Symplectic Lattices and GKP Codes -- Simple Randomized Constructions from Cryptographic Lattices,” <i>arXiv:2509.10183</i>. 2025.","chicago":"Blömer, Johannes, Yinzi Xiao, Zahra Raissi, and Stanislaw Soltan. “Symplectic Lattices and GKP Codes -- Simple Randomized Constructions from Cryptographic Lattices.” <i>ArXiv:2509.10183</i>, 2025.","ama":"Blömer J, Xiao Y, Raissi Z, Soltan S. Symplectic Lattices and GKP Codes -- Simple Randomized Constructions from Cryptographic Lattices. <i>arXiv:250910183</i>. Published online 2025."}},{"language":[{"iso":"eng"}],"publication":"Nanophotonics","abstract":[{"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.","lang":"eng"}],"publisher":"Walter de Gruyter GmbH","date_created":"2026-01-26T14:34:16Z","title":"Electro-optic frequency shift of single photons from a quantum dot","issue":"11","year":"2025","_id":"63734","user_id":"106751","department":[{"_id":"623"},{"_id":"288"},{"_id":"15"}],"article_type":"original","type":"journal_article","status":"public","date_updated":"2026-01-26T14:35:42Z","author":[{"first_name":"Sanjay","last_name":"Kapoor","full_name":"Kapoor, Sanjay"},{"full_name":"Rodek, Aleksander","last_name":"Rodek","first_name":"Aleksander"},{"first_name":"Michał","last_name":"Mikołajczyk","full_name":"Mikołajczyk, Michał"},{"first_name":"Jerzy","last_name":"Szuniewicz","full_name":"Szuniewicz, Jerzy"},{"orcid":"0000-0002-2465-4645","last_name":"Sośnicki","full_name":"Sośnicki, Filip Maksymilian","id":"106751","first_name":"Filip Maksymilian"},{"last_name":"Kazimierczuk","full_name":"Kazimierczuk, Tomasz","first_name":"Tomasz"},{"full_name":"Kossacki, Piotr","last_name":"Kossacki","first_name":"Piotr"},{"first_name":"Michał","last_name":"Karpiński","full_name":"Karpiński, Michał"}],"volume":14,"main_file_link":[{"url":"https://www.degruyterbrill.com/document/doi/10.1515/nanoph-2024-0550/html"}],"doi":"10.1515/nanoph-2024-0550","publication_status":"published","publication_identifier":{"issn":["2192-8614"]},"citation":{"short":"S. Kapoor, A. Rodek, M. Mikołajczyk, J. Szuniewicz, F.M. Sośnicki, T. Kazimierczuk, P. Kossacki, M. Karpiński, Nanophotonics 14 (2025) 1775–1782.","mla":"Kapoor, Sanjay, et al. “Electro-Optic Frequency Shift of Single Photons from a Quantum Dot.” <i>Nanophotonics</i>, vol. 14, no. 11, Walter de Gruyter GmbH, 2025, pp. 1775–82, doi:<a href=\"https://doi.org/10.1515/nanoph-2024-0550\">10.1515/nanoph-2024-0550</a>.","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={<a href=\"https://doi.org/10.1515/nanoph-2024-0550\">10.1515/nanoph-2024-0550</a>}, 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} }","apa":"Kapoor, S., Rodek, A., Mikołajczyk, M., Szuniewicz, J., Sośnicki, F. M., Kazimierczuk, T., Kossacki, P., &#38; Karpiński, M. (2025). Electro-optic frequency shift of single photons from a quantum dot. <i>Nanophotonics</i>, <i>14</i>(11), 1775–1782. <a href=\"https://doi.org/10.1515/nanoph-2024-0550\">https://doi.org/10.1515/nanoph-2024-0550</a>","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.” <i>Nanophotonics</i> 14, no. 11 (2025): 1775–82. <a href=\"https://doi.org/10.1515/nanoph-2024-0550\">https://doi.org/10.1515/nanoph-2024-0550</a>.","ieee":"S. Kapoor <i>et al.</i>, “Electro-optic frequency shift of single photons from a quantum dot,” <i>Nanophotonics</i>, vol. 14, no. 11, pp. 1775–1782, 2025, doi: <a href=\"https://doi.org/10.1515/nanoph-2024-0550\">10.1515/nanoph-2024-0550</a>.","ama":"Kapoor S, Rodek A, Mikołajczyk M, et al. Electro-optic frequency shift of single photons from a quantum dot. <i>Nanophotonics</i>. 2025;14(11):1775-1782. doi:<a href=\"https://doi.org/10.1515/nanoph-2024-0550\">10.1515/nanoph-2024-0550</a>"},"intvolume":"        14","page":"1775-1782"},{"article_number":"096111","article_type":"original","_id":"63732","user_id":"106751","department":[{"_id":"623"},{"_id":"288"},{"_id":"15"}],"status":"public","type":"journal_article","main_file_link":[{"url":"https://pubs.aip.org/aip/app/article/10/9/096111/3364187"}],"doi":"10.1063/5.0270904","date_updated":"2026-01-26T14:27:42Z","author":[{"last_name":"Kapoor","full_name":"Kapoor, Sanjay","first_name":"Sanjay"},{"first_name":"Filip Maksymilian","full_name":"Sośnicki, Filip Maksymilian","id":"106751","orcid":"0000-0002-2465-4645","last_name":"Sośnicki"},{"first_name":"Michał","last_name":"Karpiński","full_name":"Karpiński, Michał"}],"volume":10,"citation":{"chicago":"Kapoor, Sanjay, Filip Maksymilian Sośnicki, and Michał Karpiński. “Aberration-Optimized Electro-Optic Time Lens Model Using a Tunable Aperture.” <i>APL Photonics</i> 10, no. 9 (2025). <a href=\"https://doi.org/10.1063/5.0270904\">https://doi.org/10.1063/5.0270904</a>.","ieee":"S. Kapoor, F. M. Sośnicki, and M. Karpiński, “Aberration-optimized electro-optic time lens model using a tunable aperture,” <i>APL Photonics</i>, vol. 10, no. 9, Art. no. 096111, 2025, doi: <a href=\"https://doi.org/10.1063/5.0270904\">10.1063/5.0270904</a>.","ama":"Kapoor S, Sośnicki FM, Karpiński M. Aberration-optimized electro-optic time lens model using a tunable aperture. <i>APL Photonics</i>. 2025;10(9). doi:<a href=\"https://doi.org/10.1063/5.0270904\">10.1063/5.0270904</a>","short":"S. Kapoor, F.M. Sośnicki, M. Karpiński, APL Photonics 10 (2025).","mla":"Kapoor, Sanjay, et al. “Aberration-Optimized Electro-Optic Time Lens Model Using a Tunable Aperture.” <i>APL Photonics</i>, vol. 10, no. 9, 096111, AIP Publishing, 2025, doi:<a href=\"https://doi.org/10.1063/5.0270904\">10.1063/5.0270904</a>.","bibtex":"@article{Kapoor_Sośnicki_Karpiński_2025, title={Aberration-optimized electro-optic time lens model using a tunable aperture}, volume={10}, DOI={<a href=\"https://doi.org/10.1063/5.0270904\">10.1063/5.0270904</a>}, number={9096111}, journal={APL Photonics}, publisher={AIP Publishing}, author={Kapoor, Sanjay and Sośnicki, Filip Maksymilian and Karpiński, Michał}, year={2025} }","apa":"Kapoor, S., Sośnicki, F. M., &#38; Karpiński, M. (2025). Aberration-optimized electro-optic time lens model using a tunable aperture. <i>APL Photonics</i>, <i>10</i>(9), Article 096111. <a href=\"https://doi.org/10.1063/5.0270904\">https://doi.org/10.1063/5.0270904</a>"},"intvolume":"        10","publication_status":"published","publication_identifier":{"issn":["2378-0967"]},"language":[{"iso":"eng"}],"abstract":[{"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.","lang":"eng"}],"publication":"APL Photonics","title":"Aberration-optimized electro-optic time lens model using a tunable aperture","publisher":"AIP Publishing","date_created":"2026-01-26T14:24:34Z","year":"2025","issue":"9"},{"date_created":"2025-02-10T08:26:45Z","author":[{"first_name":"Denis","last_name":"Kopylov","full_name":"Kopylov, Denis","id":"98502"},{"id":"85279","full_name":"Offen, Christian","last_name":"Offen","orcid":"0000-0002-5940-8057","first_name":"Christian"},{"full_name":"Ares, Laura","last_name":"Ares","first_name":"Laura"},{"first_name":"Boris Edgar","last_name":"Wembe Moafo","full_name":"Wembe Moafo, Boris Edgar","id":"95394"},{"last_name":"Ober-Blöbaum","full_name":"Ober-Blöbaum, Sina","id":"16494","first_name":"Sina"},{"full_name":"Meier, Torsten","id":"344","last_name":"Meier","orcid":"0000-0001-8864-2072","first_name":"Torsten"},{"first_name":"Polina","last_name":"Sharapova","full_name":"Sharapova, Polina","id":"60286"},{"first_name":"Jan","id":"75127","full_name":"Sperling, Jan","orcid":"0000-0002-5844-3205","last_name":"Sperling"}],"date_updated":"2025-02-10T08:36:12Z","oa":"1","main_file_link":[{"url":"https://doi.org/10.48550/arXiv.2502.05123","open_access":"1"}],"title":"Multiphoton, multimode state classification for nonlinear optical circuits ","publication_status":"submitted","citation":{"ama":"Kopylov D, Offen C, Ares L, et al. Multiphoton, multimode state classification for nonlinear optical circuits .","ieee":"D. Kopylov <i>et al.</i>, “Multiphoton, multimode state classification for nonlinear optical circuits .” .","chicago":"Kopylov, Denis, Christian Offen, Laura Ares, Boris Edgar Wembe Moafo, Sina Ober-Blöbaum, Torsten Meier, Polina Sharapova, and Jan Sperling. “Multiphoton, Multimode State Classification for Nonlinear Optical Circuits ,” n.d.","mla":"Kopylov, Denis, et al. <i>Multiphoton, Multimode State Classification for Nonlinear Optical Circuits </i>.","short":"D. Kopylov, C. Offen, L. Ares, B.E. Wembe Moafo, S. Ober-Blöbaum, T. Meier, P. Sharapova, J. Sperling, (n.d.).","bibtex":"@article{Kopylov_Offen_Ares_Wembe Moafo_Ober-Blöbaum_Meier_Sharapova_Sperling, title={Multiphoton, multimode state classification for nonlinear optical circuits }, author={Kopylov, Denis and Offen, Christian and Ares, Laura and Wembe Moafo, Boris Edgar and Ober-Blöbaum, Sina and Meier, Torsten and Sharapova, Polina and Sperling, Jan} }","apa":"Kopylov, D., Offen, C., Ares, L., Wembe Moafo, B. E., Ober-Blöbaum, S., Meier, T., Sharapova, P., &#38; Sperling, J. (n.d.). <i>Multiphoton, multimode state classification for nonlinear optical circuits </i>."},"year":"2025","user_id":"85279","department":[{"_id":"623"},{"_id":"15"},{"_id":"636"}],"_id":"58544","external_id":{"arxiv":["2502.05123"]},"language":[{"iso":"eng"}],"type":"preprint","status":"public","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 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. ","lang":"eng"}]},{"abstract":[{"text":"<jats:p>Stable and bright single photon sources are key components for future quantum applications. A simple fabrication method is an important requirement for such sources. Here, we present a single photon source based on diced ridge waveguides in titanium indiffused LiNbO<jats:sub>3</jats:sub>. These waveguides can be easily fabricated by combining planar titanium in-diffusion without lithographic patterning and easy-to-handle precision dicing. Such devices have the potential to generate high single photon rates because ridge structures are typically less prone to the photorefractive effect. We achieve waveguide propagation losses &lt;0.4dBcm and a SHG conversion efficiency of about 81%Wcm<jats:sup>2</jats:sup>. Harnessing a type-0 SPDC process to generate 1550 nm photons, we obtain a SPDC brightness of 3⋅10<jats:sup>5</jats:sup>1s⋅mW⋅nm, with a heralding efficiency of <jats:italic>η</jats:italic><jats:sub>h</jats:sub>=45% (<jats:italic>η</jats:italic><jats:sub>h,wg</jats:sub>=77.5% for the waveguide itself excluded setup losses) and a heralded second-order correlation function of <jats:italic>g</jats:italic><jats:sub>h</jats:sub><jats:sup>2</jats:sup>(0)&lt;0.003 at low pump powers.</jats:p>","lang":"eng"}],"status":"public","type":"journal_article","publication":"Optics Continuum","article_type":"original","article_number":"593","language":[{"iso":"eng"}],"_id":"59069","user_id":"216","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"year":"2025","citation":{"apa":"Kießler, C., Kirsch, M., Lengeling, S., Herrmann, H., &#38; Silberhorn, C. (2025). SPDC single-photon source in Ti-indiffused diced ridge LiNbO<sub>3</sub> waveguides. <i>Optics Continuum</i>, <i>4</i>(3), Article 593. <a href=\"https://doi.org/10.1364/optcon.557439\">https://doi.org/10.1364/optcon.557439</a>","bibtex":"@article{Kießler_Kirsch_Lengeling_Herrmann_Silberhorn_2025, title={SPDC single-photon source in Ti-indiffused diced ridge LiNbO<sub>3</sub> waveguides}, volume={4}, DOI={<a href=\"https://doi.org/10.1364/optcon.557439\">10.1364/optcon.557439</a>}, number={3593}, journal={Optics Continuum}, publisher={Optica Publishing Group}, author={Kießler, Christian and Kirsch, Michelle and Lengeling, Sebastian and Herrmann, Harald and Silberhorn, Christine}, year={2025} }","short":"C. Kießler, M. Kirsch, S. Lengeling, H. Herrmann, C. Silberhorn, Optics Continuum 4 (2025).","mla":"Kießler, Christian, et al. “SPDC Single-Photon Source in Ti-Indiffused Diced Ridge LiNbO<sub>3</sub> Waveguides.” <i>Optics Continuum</i>, vol. 4, no. 3, 593, Optica Publishing Group, 2025, doi:<a href=\"https://doi.org/10.1364/optcon.557439\">10.1364/optcon.557439</a>.","chicago":"Kießler, Christian, Michelle Kirsch, Sebastian Lengeling, Harald Herrmann, and Christine Silberhorn. “SPDC Single-Photon Source in Ti-Indiffused Diced Ridge LiNbO<sub>3</sub> Waveguides.” <i>Optics Continuum</i> 4, no. 3 (2025). <a href=\"https://doi.org/10.1364/optcon.557439\">https://doi.org/10.1364/optcon.557439</a>.","ieee":"C. Kießler, M. Kirsch, S. Lengeling, H. Herrmann, and C. Silberhorn, “SPDC single-photon source in Ti-indiffused diced ridge LiNbO<sub>3</sub> waveguides,” <i>Optics Continuum</i>, vol. 4, no. 3, Art. no. 593, 2025, doi: <a href=\"https://doi.org/10.1364/optcon.557439\">10.1364/optcon.557439</a>.","ama":"Kießler C, Kirsch M, Lengeling S, Herrmann H, Silberhorn C. SPDC single-photon source in Ti-indiffused diced ridge LiNbO<sub>3</sub> waveguides. <i>Optics Continuum</i>. 2025;4(3). doi:<a href=\"https://doi.org/10.1364/optcon.557439\">10.1364/optcon.557439</a>"},"intvolume":"         4","publication_status":"published","publication_identifier":{"issn":["2770-0208"]},"issue":"3","title":"SPDC single-photon source in Ti-indiffused diced ridge LiNbO<sub>3</sub> waveguides","doi":"10.1364/optcon.557439","publisher":"Optica Publishing Group","date_updated":"2025-03-19T16:03:25Z","date_created":"2025-03-19T10:56:04Z","author":[{"first_name":"Christian","full_name":"Kießler, Christian","id":"44252","last_name":"Kießler"},{"last_name":"Kirsch","id":"69553","full_name":"Kirsch, Michelle","first_name":"Michelle"},{"last_name":"Lengeling","full_name":"Lengeling, Sebastian","id":"44373","first_name":"Sebastian"},{"last_name":"Herrmann","full_name":"Herrmann, Harald","id":"216","first_name":"Harald"},{"first_name":"Christine","last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263"}],"volume":4},{"publication_status":"published","publication_identifier":{"issn":["2469-9950","2469-9969"]},"quality_controlled":"1","issue":"6","year":"2025","citation":{"ama":"Pionteck MN, Roeper M, Koppitz B, et al. Second-order nonlinear piezo-optic properties of single crystal lithium niobate thin films. <i>Physical Review B</i>. 2025;111(6). doi:<a href=\"https://doi.org/10.1103/physrevb.111.064109\">10.1103/physrevb.111.064109</a>","ieee":"M. N. Pionteck <i>et al.</i>, “Second-order nonlinear piezo-optic properties of single crystal lithium niobate thin films,” <i>Physical Review B</i>, vol. 111, no. 6, Art. no. 064109, 2025, doi: <a href=\"https://doi.org/10.1103/physrevb.111.064109\">10.1103/physrevb.111.064109</a>.","chicago":"Pionteck, Mike N., Matthias Roeper, Boris Koppitz, Samuel D. Seddon, Michael Rüsing, Laura Padberg, Christof Eigner, Christine Silberhorn, Simone Sanna, and Lukas M. Eng. “Second-Order Nonlinear Piezo-Optic Properties of Single Crystal Lithium Niobate Thin Films.” <i>Physical Review B</i> 111, no. 6 (2025). <a href=\"https://doi.org/10.1103/physrevb.111.064109\">https://doi.org/10.1103/physrevb.111.064109</a>.","short":"M.N. Pionteck, M. Roeper, B. Koppitz, S.D. Seddon, M. Rüsing, L. Padberg, C. Eigner, C. Silberhorn, S. Sanna, L.M. Eng, Physical Review B 111 (2025).","bibtex":"@article{Pionteck_Roeper_Koppitz_Seddon_Rüsing_Padberg_Eigner_Silberhorn_Sanna_Eng_2025, title={Second-order nonlinear piezo-optic properties of single crystal lithium niobate thin films}, volume={111}, DOI={<a href=\"https://doi.org/10.1103/physrevb.111.064109\">10.1103/physrevb.111.064109</a>}, number={6064109}, journal={Physical Review B}, publisher={American Physical Society (APS)}, author={Pionteck, Mike N. and Roeper, Matthias and Koppitz, Boris and Seddon, Samuel D. and Rüsing, Michael and Padberg, Laura and Eigner, Christof and Silberhorn, Christine and Sanna, Simone and Eng, Lukas M.}, year={2025} }","mla":"Pionteck, Mike N., et al. “Second-Order Nonlinear Piezo-Optic Properties of Single Crystal Lithium Niobate Thin Films.” <i>Physical Review B</i>, vol. 111, no. 6, 064109, American Physical Society (APS), 2025, doi:<a href=\"https://doi.org/10.1103/physrevb.111.064109\">10.1103/physrevb.111.064109</a>.","apa":"Pionteck, M. N., Roeper, M., Koppitz, B., Seddon, S. D., Rüsing, M., Padberg, L., Eigner, C., Silberhorn, C., Sanna, S., &#38; Eng, L. M. (2025). Second-order nonlinear piezo-optic properties of single crystal lithium niobate thin films. <i>Physical Review B</i>, <i>111</i>(6), Article 064109. <a href=\"https://doi.org/10.1103/physrevb.111.064109\">https://doi.org/10.1103/physrevb.111.064109</a>"},"intvolume":"       111","publisher":"American Physical Society (APS)","date_updated":"2025-04-02T16:24:47Z","author":[{"first_name":"Mike N.","last_name":"Pionteck","full_name":"Pionteck, Mike N."},{"full_name":"Roeper, Matthias","last_name":"Roeper","first_name":"Matthias"},{"full_name":"Koppitz, Boris","last_name":"Koppitz","first_name":"Boris"},{"first_name":"Samuel D.","full_name":"Seddon, Samuel D.","last_name":"Seddon"},{"first_name":"Michael","id":"22501","full_name":"Rüsing, Michael","last_name":"Rüsing","orcid":"0000-0003-4682-4577"},{"last_name":"Padberg","full_name":"Padberg, Laura","id":"40300","first_name":"Laura"},{"first_name":"Christof","last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083","id":"13244","full_name":"Eigner, Christof"},{"first_name":"Christine","id":"26263","full_name":"Silberhorn, Christine","last_name":"Silberhorn"},{"last_name":"Sanna","full_name":"Sanna, Simone","first_name":"Simone"},{"first_name":"Lukas M.","full_name":"Eng, Lukas M.","last_name":"Eng"}],"date_created":"2025-04-02T16:21:47Z","volume":111,"title":"Second-order nonlinear piezo-optic properties of single crystal lithium niobate thin films","doi":"10.1103/physrevb.111.064109","type":"journal_article","publication":"Physical Review B","abstract":[{"text":"Stress plays a crucial role in thin films and layered systems, and thus significantly influences the material's electrical, mechanical and (nonlinear) optical responses. Despite lithium niobate's wide applicability as a nonlinear optical material, the impact of mechanical stress on its nonlinear optical properties is not well characterized. In this work, we systematically study both experimentally and theoretically, the nonlinear optical responses of thin film lithium niobate (TFLN) single crystals. Compressive and tensile stress is applied in our experiment using a piezodriven strain cell. We then record the second-harmonic-generated (SHG) response in back-reflection geometry, and compare these results to theoretical modeling using density functional theory (DFT). Both methods consistently reveal that uniaxial stress induces changes of the nonlinear optical susceptibility of certain tensor elements on the order of up to 1 pm/(V GPa). The exact value depends on the tensor element that is addressed in our SHG analysis, on the crystal orientation, and also whether using compressive or tensile stresses. Furthermore, a lowering of the crystal symmetry when applying stress along the <a:math xmlns:a=\"http://www.w3.org/1998/Math/MathML\"><a:mi>x</a:mi></a:math> or <b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:mi>y</b:mi></b:math> crystallographic axes is observed by the appearance of new nonlinear optical tensor elements within the strained crystals.","lang":"eng"}],"status":"public","_id":"59276","user_id":"22501","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"article_number":"064109","language":[{"iso":"eng"}]},{"date_updated":"2025-07-09T14:04:39Z","volume":10,"author":[{"last_name":"Devaraj","full_name":"Devaraj, Vasanthan","id":"103814","first_name":"Vasanthan"},{"id":"79462","full_name":"Ruiz Alvarado, Isaac Azahel","last_name":"Ruiz Alvarado","orcid":"0000-0002-4710-1170","first_name":"Isaac Azahel"},{"full_name":"Lee, Jong-Min","last_name":"Lee","first_name":"Jong-Min"},{"full_name":"Oh, Jin-Woo","last_name":"Oh","first_name":"Jin-Woo"},{"first_name":"Uwe","id":"171","full_name":"Gerstmann, Uwe","orcid":"0000-0002-4476-223X","last_name":"Gerstmann"},{"last_name":"Schmidt","orcid":"0000-0002-2717-5076","id":"468","full_name":"Schmidt, Wolf Gero","first_name":"Wolf Gero"},{"first_name":"Thomas","full_name":"Zentgraf, Thomas","id":"30525","last_name":"Zentgraf","orcid":"0000-0002-8662-1101"}],"doi":"10.1039/d4nh00546e","publication_identifier":{"issn":["2055-6756","2055-6764"]},"publication_status":"published","page":"537-548","intvolume":"        10","citation":{"apa":"Devaraj, V., Ruiz Alvarado, I. A., Lee, J.-M., Oh, J.-W., Gerstmann, U., Schmidt, W. G., &#38; Zentgraf, T. (2025). Self-assembly of isolated plasmonic dimers with sub-5 nm gaps on a metallic mirror. <i>Nanoscale Horizons</i>, <i>10</i>, 537–548. <a href=\"https://doi.org/10.1039/d4nh00546e\">https://doi.org/10.1039/d4nh00546e</a>","mla":"Devaraj, Vasanthan, et al. “Self-Assembly of Isolated Plasmonic Dimers with Sub-5 Nm Gaps on a Metallic Mirror.” <i>Nanoscale Horizons</i>, vol. 10, Royal Society of Chemistry (RSC), 2025, pp. 537–48, doi:<a href=\"https://doi.org/10.1039/d4nh00546e\">10.1039/d4nh00546e</a>.","bibtex":"@article{Devaraj_Ruiz Alvarado_Lee_Oh_Gerstmann_Schmidt_Zentgraf_2025, title={Self-assembly of isolated plasmonic dimers with sub-5 nm gaps on a metallic mirror}, volume={10}, DOI={<a href=\"https://doi.org/10.1039/d4nh00546e\">10.1039/d4nh00546e</a>}, journal={Nanoscale Horizons}, publisher={Royal Society of Chemistry (RSC)}, author={Devaraj, Vasanthan and Ruiz Alvarado, Isaac Azahel and Lee, Jong-Min and Oh, Jin-Woo and Gerstmann, Uwe and Schmidt, Wolf Gero and Zentgraf, Thomas}, year={2025}, pages={537–548} }","short":"V. Devaraj, I.A. Ruiz Alvarado, J.-M. Lee, J.-W. Oh, U. Gerstmann, W.G. Schmidt, T. Zentgraf, Nanoscale Horizons 10 (2025) 537–548.","chicago":"Devaraj, Vasanthan, Isaac Azahel Ruiz Alvarado, Jong-Min Lee, Jin-Woo Oh, Uwe Gerstmann, Wolf Gero Schmidt, and Thomas Zentgraf. “Self-Assembly of Isolated Plasmonic Dimers with Sub-5 Nm Gaps on a Metallic Mirror.” <i>Nanoscale Horizons</i> 10 (2025): 537–48. <a href=\"https://doi.org/10.1039/d4nh00546e\">https://doi.org/10.1039/d4nh00546e</a>.","ieee":"V. Devaraj <i>et al.</i>, “Self-assembly of isolated plasmonic dimers with sub-5 nm gaps on a metallic mirror,” <i>Nanoscale Horizons</i>, vol. 10, pp. 537–548, 2025, doi: <a href=\"https://doi.org/10.1039/d4nh00546e\">10.1039/d4nh00546e</a>.","ama":"Devaraj V, Ruiz Alvarado IA, Lee J-M, et al. Self-assembly of isolated plasmonic dimers with sub-5 nm gaps on a metallic mirror. <i>Nanoscale Horizons</i>. 2025;10:537-548. doi:<a href=\"https://doi.org/10.1039/d4nh00546e\">10.1039/d4nh00546e</a>"},"_id":"58642","project":[{"grant_number":"231447078","name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"},{"name":"TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat (B07*)","_id":"168","grant_number":"231447078"},{"name":"TRR 142 - B: TRR 142 - Project Area B","_id":"55"},{"name":"Hochleistungsrechner Noctua in Paderborn","_id":"445","grant_number":"367360193"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"department":[{"_id":"15"},{"_id":"230"},{"_id":"289"},{"_id":"623"},{"_id":"35"},{"_id":"295"},{"_id":"170"},{"_id":"429"},{"_id":"27"}],"user_id":"16199","article_type":"original","type":"journal_article","status":"public","publisher":"Royal Society of Chemistry (RSC)","date_created":"2025-02-14T08:13:10Z","title":"Self-assembly of isolated plasmonic dimers with sub-5 nm gaps on a metallic mirror","quality_controlled":"1","year":"2025","language":[{"iso":"eng"}],"publication":"Nanoscale Horizons","abstract":[{"text":"We present a cost-effective self-assembly method to fabricate low-density dimer NPs in an NPoM architecture, using the M13 phage as a spacer layer. This will enable the development of dynamic plasmonic devices and advanced sensing applications.","lang":"eng"}]},{"status":"public","editor":[{"first_name":"Mark A.","full_name":"Itzler, Mark A.","last_name":"Itzler"},{"first_name":"K. Alex","last_name":"McIntosh","full_name":"McIntosh, K. Alex"},{"full_name":"Bienfang, Joshua C.","last_name":"Bienfang","first_name":"Joshua C."}],"type":"conference","publication":"Advanced Photon Counting Techniques XIX","language":[{"iso":"eng"}],"user_id":"55629","department":[{"_id":"15"},{"_id":"623"}],"project":[{"name":"QuESADILLA: ERC-Grant: QuESADILLA: Quantum Engineering Superconducting Array Detectors in Low-Light Applications","_id":"239","grant_number":"101042399","call_identifier":"ERC"},{"name":"PhoQuant--QCTest: PhoQuant: Photonische Quantencomputer -  Quantencomputing Testplattform","_id":"191","grant_number":"13N16103"}],"_id":"60587","citation":{"short":"T. Schapeler, F. Schlue, M. Stefszky, B. Brecht, C. Silberhorn, T. Bartley, in: M.A. Itzler, K.A. McIntosh, J.C. Bienfang (Eds.), Advanced Photon Counting Techniques XIX, SPIE, 2025.","mla":"Schapeler, Timon, et al. “Optimizing Photon-Number Resolution with Superconducting Nanowire Multi-Photon Detectors.” <i>Advanced Photon Counting Techniques XIX</i>, edited by Mark A. Itzler et al., SPIE, 2025, doi:<a href=\"https://doi.org/10.1117/12.3054905\">10.1117/12.3054905</a>.","bibtex":"@inproceedings{Schapeler_Schlue_Stefszky_Brecht_Silberhorn_Bartley_2025, title={Optimizing photon-number resolution with superconducting nanowire multi-photon detectors}, DOI={<a href=\"https://doi.org/10.1117/12.3054905\">10.1117/12.3054905</a>}, booktitle={Advanced Photon Counting Techniques XIX}, publisher={SPIE}, author={Schapeler, Timon and Schlue, Fabian and Stefszky, Michael and Brecht, Benjamin and Silberhorn, Christine and Bartley, Tim}, editor={Itzler, Mark A. and McIntosh, K. Alex and Bienfang, Joshua C.}, year={2025} }","apa":"Schapeler, T., Schlue, F., Stefszky, M., Brecht, B., Silberhorn, C., &#38; Bartley, T. (2025). Optimizing photon-number resolution with superconducting nanowire multi-photon detectors. In M. A. Itzler, K. A. McIntosh, &#38; J. C. Bienfang (Eds.), <i>Advanced Photon Counting Techniques XIX</i>. SPIE. <a href=\"https://doi.org/10.1117/12.3054905\">https://doi.org/10.1117/12.3054905</a>","chicago":"Schapeler, Timon, Fabian Schlue, Michael Stefszky, Benjamin Brecht, Christine Silberhorn, and Tim Bartley. “Optimizing Photon-Number Resolution with Superconducting Nanowire Multi-Photon Detectors.” In <i>Advanced Photon Counting Techniques XIX</i>, edited by Mark A. Itzler, K. Alex McIntosh, and Joshua C. Bienfang. SPIE, 2025. <a href=\"https://doi.org/10.1117/12.3054905\">https://doi.org/10.1117/12.3054905</a>.","ieee":"T. Schapeler, F. Schlue, M. Stefszky, B. Brecht, C. Silberhorn, and T. Bartley, “Optimizing photon-number resolution with superconducting nanowire multi-photon detectors,” in <i>Advanced Photon Counting Techniques XIX</i>, 2025, doi: <a href=\"https://doi.org/10.1117/12.3054905\">10.1117/12.3054905</a>.","ama":"Schapeler T, Schlue F, Stefszky M, Brecht B, Silberhorn C, Bartley T. Optimizing photon-number resolution with superconducting nanowire multi-photon detectors. In: Itzler MA, McIntosh KA, Bienfang JC, eds. <i>Advanced Photon Counting Techniques XIX</i>. SPIE; 2025. doi:<a href=\"https://doi.org/10.1117/12.3054905\">10.1117/12.3054905</a>"},"year":"2025","publication_status":"published","doi":"10.1117/12.3054905","title":"Optimizing photon-number resolution with superconducting nanowire multi-photon detectors","author":[{"full_name":"Schapeler, Timon","id":"55629","orcid":"0000-0001-7652-1716","last_name":"Schapeler","first_name":"Timon"},{"last_name":"Schlue","id":"63579","full_name":"Schlue, Fabian","first_name":"Fabian"},{"first_name":"Michael","full_name":"Stefszky, Michael","id":"42777","last_name":"Stefszky"},{"last_name":"Brecht","orcid":"0000-0003-4140-0556 ","id":"27150","full_name":"Brecht, Benjamin","first_name":"Benjamin"},{"first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263","last_name":"Silberhorn"},{"last_name":"Bartley","id":"49683","full_name":"Bartley, Tim","first_name":"Tim"}],"date_created":"2025-07-11T09:18:09Z","date_updated":"2025-07-11T09:22:11Z","publisher":"SPIE"},{"status":"public","type":"journal_article","article_type":"original","article_number":"086113","project":[{"name":"PhoQuant: Photonische Quantencomputer -  Quantencomputing Testplattform","_id":"191"},{"_id":"239","name":"ERC-Grant: QuESADILLA: Quantum Engineering Superconducting Array Detectors in Low-Light Applications"}],"_id":"61110","user_id":"55629","department":[{"_id":"623"},{"_id":"15"}],"citation":{"apa":"Sidorova, M., Schapeler, T., Semenov, A. D., Schlue, F., Stefszky, M., Brecht, B., Silberhorn, C., &#38; Bartley, T. (2025). Jitter in photon-number-resolved detection by superconducting nanowires. <i>APL Photonics</i>, <i>10</i>(8), Article 086113. <a href=\"https://doi.org/10.1063/5.0273752\">https://doi.org/10.1063/5.0273752</a>","short":"M. Sidorova, T. Schapeler, A.D. Semenov, F. Schlue, M. Stefszky, B. Brecht, C. Silberhorn, T. Bartley, APL Photonics 10 (2025).","bibtex":"@article{Sidorova_Schapeler_Semenov_Schlue_Stefszky_Brecht_Silberhorn_Bartley_2025, title={Jitter in photon-number-resolved detection by superconducting nanowires}, volume={10}, DOI={<a href=\"https://doi.org/10.1063/5.0273752\">10.1063/5.0273752</a>}, number={8086113}, journal={APL Photonics}, publisher={AIP Publishing}, author={Sidorova, Mariia and Schapeler, Timon and Semenov, Alexej D. and Schlue, Fabian and Stefszky, Michael and Brecht, Benjamin and Silberhorn, Christine and Bartley, Tim}, year={2025} }","mla":"Sidorova, Mariia, et al. “Jitter in Photon-Number-Resolved Detection by Superconducting Nanowires.” <i>APL Photonics</i>, vol. 10, no. 8, 086113, AIP Publishing, 2025, doi:<a href=\"https://doi.org/10.1063/5.0273752\">10.1063/5.0273752</a>.","ama":"Sidorova M, Schapeler T, Semenov AD, et al. Jitter in photon-number-resolved detection by superconducting nanowires. <i>APL Photonics</i>. 2025;10(8). doi:<a href=\"https://doi.org/10.1063/5.0273752\">10.1063/5.0273752</a>","chicago":"Sidorova, Mariia, Timon Schapeler, Alexej D. Semenov, Fabian Schlue, Michael Stefszky, Benjamin Brecht, Christine Silberhorn, and Tim Bartley. “Jitter in Photon-Number-Resolved Detection by Superconducting Nanowires.” <i>APL Photonics</i> 10, no. 8 (2025). <a href=\"https://doi.org/10.1063/5.0273752\">https://doi.org/10.1063/5.0273752</a>.","ieee":"M. Sidorova <i>et al.</i>, “Jitter in photon-number-resolved detection by superconducting nanowires,” <i>APL Photonics</i>, vol. 10, no. 8, Art. no. 086113, 2025, doi: <a href=\"https://doi.org/10.1063/5.0273752\">10.1063/5.0273752</a>."},"intvolume":"        10","publication_status":"published","publication_identifier":{"issn":["2378-0967"]},"main_file_link":[{"open_access":"1"}],"doi":"10.1063/5.0273752","date_updated":"2025-09-02T10:47:08Z","oa":"1","author":[{"first_name":"Mariia","full_name":"Sidorova, Mariia","last_name":"Sidorova"},{"full_name":"Schapeler, Timon","id":"55629","orcid":"0000-0001-7652-1716","last_name":"Schapeler","first_name":"Timon"},{"first_name":"Alexej D.","last_name":"Semenov","full_name":"Semenov, Alexej D."},{"id":"63579","full_name":"Schlue, Fabian","last_name":"Schlue","first_name":"Fabian"},{"first_name":"Michael","id":"42777","full_name":"Stefszky, Michael","last_name":"Stefszky"},{"first_name":"Benjamin","orcid":"0000-0003-4140-0556 ","last_name":"Brecht","full_name":"Brecht, Benjamin","id":"27150"},{"first_name":"Christine","last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263"},{"last_name":"Bartley","id":"49683","full_name":"Bartley, Tim","first_name":"Tim"}],"volume":10,"abstract":[{"text":"<jats:p>By analyzing the physics of multi-photon absorption in superconducting nanowire single-photon detectors (SNSPDs), we identify physical components of jitter. From this, we formulate a quantitative physical model of the multi-photon detector response that combines the local detection mechanism and local fluctuations (hotspot formation and intrinsic jitter) with the thermoelectric dynamics of resistive domains. Our model provides an excellent description of the arrival-time histogram of a commercial SNSPD across several orders of magnitude, both in arrival-time probability and across mean photon number. This is achieved with just three fitting parameters: the scaling of the mean arrival time of voltage response pulses, as well as the Gaussian and exponential jitter components. Our findings have important implications for photon-number-resolving detector design, as well as applications requiring low jitter, such as light detection and ranging (LIDAR).</jats:p>","lang":"eng"}],"publication":"APL Photonics","keyword":["Jitter","PNR","SNSPD"],"language":[{"iso":"eng"}],"external_id":{"arxiv":["arXiv:2503.17146"]},"year":"2025","issue":"8","title":"Jitter in photon-number-resolved detection by superconducting nanowires","publisher":"AIP Publishing","date_created":"2025-09-01T11:12:19Z"},{"language":[{"iso":"eng"}],"publication":"Physical Review A","title":"Entanglement between dependent degrees of freedom: Quasiparticle correlations","publisher":"American Physical Society (APS)","date_created":"2025-09-12T10:37:34Z","year":"2025","issue":"3","article_number":"032404","_id":"61245","project":[{"name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"},{"_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"}],"department":[{"_id":"15"},{"_id":"170"},{"_id":"297"},{"_id":"706"},{"_id":"35"},{"_id":"230"},{"_id":"623"},{"_id":"429"}],"user_id":"16199","status":"public","type":"journal_article","doi":"10.1103/physreva.111.032404","date_updated":"2025-09-12T10:42:16Z","volume":111,"author":[{"full_name":"Barkhausen, Franziska","id":"63631","last_name":"Barkhausen","first_name":"Franziska"},{"first_name":"Laura","last_name":"Ares Santos","full_name":"Ares Santos, Laura"},{"orcid":"0000-0003-4042-4951","last_name":"Schumacher","id":"27271","full_name":"Schumacher, Stefan","first_name":"Stefan"},{"full_name":"Sperling, Jan","id":"75127","orcid":"0000-0002-5844-3205","last_name":"Sperling","first_name":"Jan"}],"intvolume":"       111","citation":{"apa":"Barkhausen, F., Ares Santos, L., Schumacher, S., &#38; Sperling, J. (2025). Entanglement between dependent degrees of freedom: Quasiparticle correlations. <i>Physical Review A</i>, <i>111</i>(3), Article 032404. <a href=\"https://doi.org/10.1103/physreva.111.032404\">https://doi.org/10.1103/physreva.111.032404</a>","short":"F. Barkhausen, L. Ares Santos, S. Schumacher, J. Sperling, Physical Review A 111 (2025).","bibtex":"@article{Barkhausen_Ares Santos_Schumacher_Sperling_2025, title={Entanglement between dependent degrees of freedom: Quasiparticle correlations}, volume={111}, DOI={<a href=\"https://doi.org/10.1103/physreva.111.032404\">10.1103/physreva.111.032404</a>}, 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} }","mla":"Barkhausen, Franziska, et al. “Entanglement between Dependent Degrees of Freedom: Quasiparticle Correlations.” <i>Physical Review A</i>, vol. 111, no. 3, 032404, American Physical Society (APS), 2025, doi:<a href=\"https://doi.org/10.1103/physreva.111.032404\">10.1103/physreva.111.032404</a>.","chicago":"Barkhausen, Franziska, Laura Ares Santos, Stefan Schumacher, and Jan Sperling. “Entanglement between Dependent Degrees of Freedom: Quasiparticle Correlations.” <i>Physical Review A</i> 111, no. 3 (2025). <a href=\"https://doi.org/10.1103/physreva.111.032404\">https://doi.org/10.1103/physreva.111.032404</a>.","ieee":"F. Barkhausen, L. Ares Santos, S. Schumacher, and J. Sperling, “Entanglement between dependent degrees of freedom: Quasiparticle correlations,” <i>Physical Review A</i>, vol. 111, no. 3, Art. no. 032404, 2025, doi: <a href=\"https://doi.org/10.1103/physreva.111.032404\">10.1103/physreva.111.032404</a>.","ama":"Barkhausen F, Ares Santos L, Schumacher S, Sperling J. Entanglement between dependent degrees of freedom: Quasiparticle correlations. <i>Physical Review A</i>. 2025;111(3). doi:<a href=\"https://doi.org/10.1103/physreva.111.032404\">10.1103/physreva.111.032404</a>"},"publication_identifier":{"issn":["2469-9926","2469-9934"]},"publication_status":"published"},{"status":"public","type":"journal_article","article_type":"original","article_number":"116949","user_id":"22501","department":[{"_id":"15"},{"_id":"288"},{"_id":"623"}],"_id":"61338","citation":{"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.” <i>Solid State Ionics</i> 429 (2025). <a href=\"https://doi.org/10.1016/j.ssi.2025.116949\">https://doi.org/10.1016/j.ssi.2025.116949</a>.","ieee":"H. Wulfmeier <i>et al.</i>, “Demonstration of domain wall current in MgO-doped lithium niobate single crystals up to 400°C,” <i>Solid State Ionics</i>, vol. 429, Art. no. 116949, 2025, doi: <a href=\"https://doi.org/10.1016/j.ssi.2025.116949\">10.1016/j.ssi.2025.116949</a>.","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. <i>Solid State Ionics</i>. 2025;429. doi:<a href=\"https://doi.org/10.1016/j.ssi.2025.116949\">10.1016/j.ssi.2025.116949</a>","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., &#38; Fritze, H. (2025). Demonstration of domain wall current in MgO-doped lithium niobate single crystals up to 400°C. <i>Solid State Ionics</i>, <i>429</i>, Article 116949. <a href=\"https://doi.org/10.1016/j.ssi.2025.116949\">https://doi.org/10.1016/j.ssi.2025.116949</a>","mla":"Wulfmeier, Hendrik, et al. “Demonstration of Domain Wall Current in MgO-Doped Lithium Niobate Single Crystals up to 400°C.” <i>Solid State Ionics</i>, vol. 429, 116949, Elsevier BV, 2025, doi:<a href=\"https://doi.org/10.1016/j.ssi.2025.116949\">10.1016/j.ssi.2025.116949</a>.","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).","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={<a href=\"https://doi.org/10.1016/j.ssi.2025.116949\">10.1016/j.ssi.2025.116949</a>}, 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} }"},"intvolume":"       429","publication_status":"published","publication_identifier":{"issn":["0167-2738"]},"main_file_link":[{"url":"https://doi.org/10.1016/j.ssi.2025.116949","open_access":"1"}],"doi":"10.1016/j.ssi.2025.116949","author":[{"first_name":"Hendrik","full_name":"Wulfmeier, Hendrik","last_name":"Wulfmeier"},{"last_name":"Yakhnevych","full_name":"Yakhnevych, Uliana","first_name":"Uliana"},{"first_name":"Cornelius","last_name":"Boekhoff","full_name":"Boekhoff, Cornelius"},{"last_name":"Diima","full_name":"Diima, Allan","first_name":"Allan"},{"first_name":"Marlo","last_name":"Kunzner","full_name":"Kunzner, Marlo"},{"first_name":"Leonard M.","last_name":"Verhoff","full_name":"Verhoff, Leonard M."},{"first_name":"Jonas","full_name":"Paul, Jonas","last_name":"Paul"},{"last_name":"Ratzenberger","full_name":"Ratzenberger, Julius","first_name":"Julius"},{"first_name":"Elke","last_name":"Beyreuther","full_name":"Beyreuther, Elke"},{"last_name":"Gössel","full_name":"Gössel, Joshua","first_name":"Joshua"},{"full_name":"Kiseleva, Iuliia","last_name":"Kiseleva","first_name":"Iuliia"},{"first_name":"Michael","id":"22501","full_name":"Rüsing, Michael","last_name":"Rüsing","orcid":"0000-0003-4682-4577"},{"first_name":"Simone","last_name":"Sanna","full_name":"Sanna, Simone"},{"full_name":"Eng, Lukas M.","last_name":"Eng","first_name":"Lukas M."},{"last_name":"Fritze","full_name":"Fritze, Holger","first_name":"Holger"}],"volume":429,"oa":"1","date_updated":"2025-09-17T16:19:51Z","abstract":[{"lang":"eng","text":"Conductive ferroelectric domain walls (DWs) represent a promising topical system for the development of nanoelectronic components and device sensors to be operational at elevated temperatures. DWs show very different properties as compared to their hosting bulk crystal, in particular with respect to the high local electrical conductivity. The objective of this work is to demonstrate DW conductivity up to temperatures as high as 400 °C which extends previous studies significantly. Experimental investigation of the DW conductivity of charged, inclined DWs is performed using 5 mol % MgO-doped lithium niobate single crystals. Current–voltage (  ) curves are determined by DC electrometer measurements and impedance spectroscopy and found to be identical. Moreover, impedance spectroscopy enables to recognize artifacts such as damaged electrodes. Temperature dependent measurements over repeated heating cycles reveal two distinct thermal activation energies for a given DW, with the higher of the activation energies only measured at higher temperatures. Depending on the specific sample, the higher activation energy is found above 160 °C to 230 °C. This suggests, in turn, that more than one type of defect/polaron is involved, and that the dominant transport mechanism changes with increasing temperature. First principles atomistic modeling suggests that the conductivity of inclined domain walls cannot be solely explained by the formation of a 2D carrier gas and must be supported by hopping processes. This holds true even at temperatures as high as 400 °C. Our investigations underline the potential to extend DW current based nanoelectronic and sensor applications even into the so-far unexplored temperature range up to 400 °C."}],"publication":"Solid State Ionics","language":[{"iso":"eng"}],"year":"2025","quality_controlled":"1","title":"Demonstration of domain wall current in MgO-doped lithium niobate single crystals up to 400°C","date_created":"2025-09-17T16:18:18Z","publisher":"Elsevier BV"},{"type":"journal_article","status":"public","user_id":"22501","department":[{"_id":"15"},{"_id":"623"}],"_id":"61337","funded_apc":"1","article_number":"034101","publication_status":"published","publication_identifier":{"issn":["0021-8979","1089-7550"]},"citation":{"apa":"Koppitz, B., Saxena, T., Bernhardt, F., Ganschow, S., Sanna, S., Rüsing, M., &#38; Eng, L. M. (2025). Second harmonic generation contrasts of ferroelectric domain structures and composition in lithium niobate–tantalate mixed crystals. <i>Journal of Applied Physics</i>, <i>138</i>(3), Article 034101. <a href=\"https://doi.org/10.1063/5.0276183\">https://doi.org/10.1063/5.0276183</a>","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={<a href=\"https://doi.org/10.1063/5.0276183\">10.1063/5.0276183</a>}, 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} }","mla":"Koppitz, Boris, et al. “Second Harmonic Generation Contrasts of Ferroelectric Domain Structures and Composition in Lithium Niobate–Tantalate Mixed Crystals.” <i>Journal of Applied Physics</i>, vol. 138, no. 3, 034101, AIP Publishing, 2025, doi:<a href=\"https://doi.org/10.1063/5.0276183\">10.1063/5.0276183</a>.","ieee":"B. Koppitz <i>et al.</i>, “Second harmonic generation contrasts of ferroelectric domain structures and composition in lithium niobate–tantalate mixed crystals,” <i>Journal of Applied Physics</i>, vol. 138, no. 3, Art. no. 034101, 2025, doi: <a href=\"https://doi.org/10.1063/5.0276183\">10.1063/5.0276183</a>.","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.” <i>Journal of Applied Physics</i> 138, no. 3 (2025). <a href=\"https://doi.org/10.1063/5.0276183\">https://doi.org/10.1063/5.0276183</a>.","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. <i>Journal of Applied Physics</i>. 2025;138(3). doi:<a href=\"https://doi.org/10.1063/5.0276183\">10.1063/5.0276183</a>"},"intvolume":"       138","author":[{"first_name":"Boris","last_name":"Koppitz","full_name":"Koppitz, Boris"},{"full_name":"Saxena, Tanya","last_name":"Saxena","first_name":"Tanya"},{"first_name":"Felix","last_name":"Bernhardt","full_name":"Bernhardt, Felix"},{"full_name":"Ganschow, Steffen","last_name":"Ganschow","first_name":"Steffen"},{"first_name":"Simone","full_name":"Sanna, Simone","last_name":"Sanna"},{"orcid":"0000-0003-4682-4577","last_name":"Rüsing","id":"22501","full_name":"Rüsing, Michael","first_name":"Michael"},{"full_name":"Eng, Lukas M.","last_name":"Eng","first_name":"Lukas M."}],"volume":138,"oa":"1","date_updated":"2025-09-17T16:18:02Z","main_file_link":[{"open_access":"1","url":"https://pubs.aip.org/aip/jap/article/138/3/034101/3352909"}],"doi":"10.1063/5.0276183","publication":"Journal of Applied Physics","abstract":[{"lang":"eng","text":"<jats:p>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.</jats:p>"}],"language":[{"iso":"eng"}],"issue":"3","quality_controlled":"1","year":"2025","date_created":"2025-09-17T16:16:04Z","publisher":"AIP Publishing","title":"Second harmonic generation contrasts of ferroelectric domain structures and composition in lithium niobate–tantalate mixed crystals"},{"article_number":"1621","language":[{"iso":"eng"}],"_id":"58519","project":[{"name":"PhoQC: PhoQC: Photonisches Quantencomputing","_id":"266"},{"_id":"52","name":"Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"department":[{"_id":"15"},{"_id":"569"},{"_id":"170"},{"_id":"293"},{"_id":"35"},{"_id":"230"},{"_id":"623"},{"_id":"27"}],"user_id":"16199","abstract":[{"text":"<jats:p>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.</jats:p>","lang":"eng"}],"status":"public","publication":"Quantum","type":"journal_article","title":"Theory of Multimode Squeezed Light Generation in Lossy Media","doi":"10.22331/q-2025-02-04-1621","publisher":"Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften","date_updated":"2025-09-18T13:22:26Z","volume":9,"author":[{"last_name":"Kopylov","full_name":"Kopylov, Denis A.","first_name":"Denis A."},{"first_name":"Torsten","last_name":"Meier","orcid":"0000-0001-8864-2072","id":"344","full_name":"Meier, Torsten"},{"first_name":"Polina R.","full_name":"Sharapova, Polina R.","id":"60286","last_name":"Sharapova"}],"date_created":"2025-02-05T12:57:37Z","year":"2025","intvolume":"         9","citation":{"mla":"Kopylov, Denis A., et al. “Theory of Multimode Squeezed Light Generation in Lossy Media.” <i>Quantum</i>, vol. 9, 1621, Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften, 2025, doi:<a href=\"https://doi.org/10.22331/q-2025-02-04-1621\">10.22331/q-2025-02-04-1621</a>.","short":"D.A. Kopylov, T. Meier, P.R. Sharapova, Quantum 9 (2025).","bibtex":"@article{Kopylov_Meier_Sharapova_2025, title={Theory of Multimode Squeezed Light Generation in Lossy Media}, volume={9}, DOI={<a href=\"https://doi.org/10.22331/q-2025-02-04-1621\">10.22331/q-2025-02-04-1621</a>}, 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} }","apa":"Kopylov, D. A., Meier, T., &#38; Sharapova, P. R. (2025). Theory of Multimode Squeezed Light Generation in Lossy Media. <i>Quantum</i>, <i>9</i>, Article 1621. <a href=\"https://doi.org/10.22331/q-2025-02-04-1621\">https://doi.org/10.22331/q-2025-02-04-1621</a>","ama":"Kopylov DA, Meier T, Sharapova PR. Theory of Multimode Squeezed Light Generation in Lossy Media. <i>Quantum</i>. 2025;9. doi:<a href=\"https://doi.org/10.22331/q-2025-02-04-1621\">10.22331/q-2025-02-04-1621</a>","ieee":"D. A. Kopylov, T. Meier, and P. R. Sharapova, “Theory of Multimode Squeezed Light Generation in Lossy Media,” <i>Quantum</i>, vol. 9, Art. no. 1621, 2025, doi: <a href=\"https://doi.org/10.22331/q-2025-02-04-1621\">10.22331/q-2025-02-04-1621</a>.","chicago":"Kopylov, Denis A., Torsten Meier, and Polina R. Sharapova. “Theory of Multimode Squeezed Light Generation in Lossy Media.” <i>Quantum</i> 9 (2025). <a href=\"https://doi.org/10.22331/q-2025-02-04-1621\">https://doi.org/10.22331/q-2025-02-04-1621</a>."},"publication_identifier":{"issn":["2521-327X"]},"publication_status":"published"},{"year":"2025","issue":"10","title":"TFLN channel waveguides of rib and strip type: Properties of guided modes","date_created":"2025-08-06T09:36:30Z","publisher":"Optica Publishing Group","file":[{"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_id":"61516","file_size":5417636,"creator":"fossie","date_created":"2025-10-05T11:48:25Z","date_updated":"2025-10-05T11:48:25Z","relation":"main_file","success":1,"content_type":"application/pdf"}],"abstract":[{"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.","lang":"eng"}],"publication":"Optics Continuum","language":[{"iso":"eng"}],"keyword":["tet_topic_waveguide"],"ddc":["530"],"page":"2356","intvolume":"         4","citation":{"mla":"Hammer, Manfred, et al. “TFLN Channel Waveguides of Rib and Strip Type: Properties of Guided Modes.” <i>Optics Continuum</i>, vol. 4, no. 10, Optica Publishing Group, 2025, p. 2356, doi:<a href=\"https://doi.org/10.1364/optcon.569959\">10.1364/optcon.569959</a>.","short":"M. Hammer, S. Khan, B. Taheri, H. Farheen, J. Förstner, Optics Continuum 4 (2025) 2356.","bibtex":"@article{Hammer_Khan_Taheri_Farheen_Förstner_2025, title={TFLN channel waveguides of rib and strip type: Properties of guided modes}, volume={4}, DOI={<a href=\"https://doi.org/10.1364/optcon.569959\">10.1364/optcon.569959</a>}, 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} }","apa":"Hammer, M., Khan, S., Taheri, B., Farheen, H., &#38; Förstner, J. (2025). TFLN channel waveguides of rib and strip type: Properties of guided modes. <i>Optics Continuum</i>, <i>4</i>(10), 2356. <a href=\"https://doi.org/10.1364/optcon.569959\">https://doi.org/10.1364/optcon.569959</a>","ieee":"M. Hammer, S. Khan, B. Taheri, H. Farheen, and J. Förstner, “TFLN channel waveguides of rib and strip type: Properties of guided modes,” <i>Optics Continuum</i>, vol. 4, no. 10, p. 2356, 2025, doi: <a href=\"https://doi.org/10.1364/optcon.569959\">10.1364/optcon.569959</a>.","chicago":"Hammer, Manfred, Shahriar Khan, Behnood Taheri, Henna Farheen, and Jens Förstner. “TFLN Channel Waveguides of Rib and Strip Type: Properties of Guided Modes.” <i>Optics Continuum</i> 4, no. 10 (2025): 2356. <a href=\"https://doi.org/10.1364/optcon.569959\">https://doi.org/10.1364/optcon.569959</a>.","ama":"Hammer M, Khan S, Taheri B, Farheen H, Förstner J. TFLN channel waveguides of rib and strip type: Properties of guided modes. <i>Optics Continuum</i>. 2025;4(10):2356. doi:<a href=\"https://doi.org/10.1364/optcon.569959\">10.1364/optcon.569959</a>"},"has_accepted_license":"1","publication_identifier":{"issn":["2770-0208"]},"publication_status":"published","doi":"10.1364/optcon.569959","volume":4,"author":[{"first_name":"Manfred","last_name":"Hammer","orcid":"0000-0002-6331-9348","id":"48077","full_name":"Hammer, Manfred"},{"last_name":"Khan","full_name":"Khan, Shahriar","first_name":"Shahriar"},{"first_name":"Behnood","last_name":"Taheri","full_name":"Taheri, Behnood"},{"first_name":"Henna","orcid":"0000-0001-7730-3489","last_name":"Farheen","full_name":"Farheen, Henna","id":"53444"},{"first_name":"Jens","last_name":"Förstner","orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens","id":"158"}],"date_updated":"2025-10-05T11:52:55Z","status":"public","type":"journal_article","file_date_updated":"2025-10-05T11:48:25Z","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"623"}],"user_id":"158","_id":"60891"},{"language":[{"iso":"eng"}],"keyword":["tet_topic_waveguide"],"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"623"}],"user_id":"158","_id":"61760","status":"public","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"}],"editor":[{"last_name":"Ni","full_name":"Ni, Xingjie","first_name":"Xingjie"},{"first_name":"Wenshan","last_name":"Cai","full_name":"Cai, Wenshan"}],"publication":"Photonic Computing: From Materials and Devices to Systems and Applications II","type":"conference","doi":"10.1117/12.3065734","title":"Topology-optimized silicon nitride coupler for integrated single-photon emitters","author":[{"full_name":"Farheen, Henna","id":"53444","orcid":"0000-0001-7730-3489","last_name":"Farheen","first_name":"Henna"},{"full_name":"Chen, Yuheng","last_name":"Chen","first_name":"Yuheng"},{"first_name":"Peigang","full_name":"Chen, Peigang","last_name":"Chen"},{"full_name":"Kryvobok, Artem","last_name":"Kryvobok","first_name":"Artem"},{"last_name":"Peana","full_name":"Peana, Samuel","first_name":"Samuel"},{"first_name":"Alexander","last_name":"Senichev","full_name":"Senichev, Alexander"},{"first_name":"Vladimir M.","full_name":"Shalaev, Vladimir M.","last_name":"Shalaev"},{"last_name":"Boltasseva","full_name":"Boltasseva, Alexandra","first_name":"Alexandra"},{"orcid":"0000-0001-7059-9862","last_name":"Förstner","id":"158","full_name":"Förstner, Jens","first_name":"Jens"},{"full_name":"Kildishev, Alexander V.","last_name":"Kildishev","first_name":"Alexander V."}],"date_created":"2025-10-08T15:20:13Z","date_updated":"2025-10-08T15:22:30Z","publisher":"SPIE","citation":{"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 <i>Photonic Computing: From Materials and Devices to Systems and Applications II</i>, edited by Xingjie Ni and Wenshan Cai. SPIE, 2025. <a href=\"https://doi.org/10.1117/12.3065734\">https://doi.org/10.1117/12.3065734</a>.","ieee":"H. Farheen <i>et al.</i>, “Topology-optimized silicon nitride coupler for integrated single-photon emitters,” in <i>Photonic Computing: From Materials and Devices to Systems and Applications II</i>, 2025, doi: <a href=\"https://doi.org/10.1117/12.3065734\">10.1117/12.3065734</a>.","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. <i>Photonic Computing: From Materials and Devices to Systems and Applications II</i>. SPIE; 2025. doi:<a href=\"https://doi.org/10.1117/12.3065734\">10.1117/12.3065734</a>","apa":"Farheen, H., Chen, Y., Chen, P., Kryvobok, A., Peana, S., Senichev, A., Shalaev, V. M., Boltasseva, A., Förstner, J., &#38; Kildishev, A. V. (2025). Topology-optimized silicon nitride coupler for integrated single-photon emitters. In X. Ni &#38; W. Cai (Eds.), <i>Photonic Computing: From Materials and Devices to Systems and Applications II</i>. SPIE. <a href=\"https://doi.org/10.1117/12.3065734\">https://doi.org/10.1117/12.3065734</a>","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.","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={<a href=\"https://doi.org/10.1117/12.3065734\">10.1117/12.3065734</a>}, 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} }","mla":"Farheen, Henna, et al. “Topology-Optimized Silicon Nitride Coupler for Integrated Single-Photon Emitters.” <i>Photonic Computing: From Materials and Devices to Systems and Applications II</i>, edited by Xingjie Ni and Wenshan Cai, SPIE, 2025, doi:<a href=\"https://doi.org/10.1117/12.3065734\">10.1117/12.3065734</a>."},"year":"2025","publication_status":"published"},{"title":"In vacuum metasurface for optical microtrap array","publisher":"Optica Publishing Group","date_created":"2025-11-24T06:31:17Z","year":"2025","quality_controlled":"1","issue":"24","language":[{"iso":"eng"}],"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."}],"publication":"Optics Express","main_file_link":[{"open_access":"1","url":"https://opg.optica.org/oe/fulltext.cfm?uri=oe-33-24-51085"}],"doi":"10.1364/oe.580201","date_updated":"2025-11-24T06:35:19Z","oa":"1","author":[{"first_name":"Donghao","last_name":"Li","full_name":"Li, Donghao"},{"first_name":"Qiming","full_name":"Liao, Qiming","last_name":"Liao"},{"full_name":"Xu, Beining","last_name":"Xu","first_name":"Beining"},{"id":"30525","full_name":"Zentgraf, Thomas","orcid":"0000-0002-8662-1101","last_name":"Zentgraf","first_name":"Thomas"},{"full_name":"Narvaez Castaneda, Emmanuel","last_name":"Narvaez Castaneda","first_name":"Emmanuel"},{"first_name":"Yaoting","full_name":"Zhou, Yaoting","last_name":"Zhou"},{"last_name":"Qin","full_name":"Qin, Keyu","first_name":"Keyu"},{"last_name":"Xu","full_name":"Xu, Zhongxiao","first_name":"Zhongxiao"},{"last_name":"Shen","full_name":"Shen, Heng","first_name":"Heng"},{"first_name":"Lingling","full_name":"Huang, Lingling","last_name":"Huang"}],"volume":33,"citation":{"ama":"Li D, Liao Q, Xu B, et al. In vacuum metasurface for optical microtrap array. <i>Optics Express</i>. 2025;33(24). doi:<a href=\"https://doi.org/10.1364/oe.580201\">10.1364/oe.580201</a>","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.” <i>Optics Express</i> 33, no. 24 (2025). <a href=\"https://doi.org/10.1364/oe.580201\">https://doi.org/10.1364/oe.580201</a>.","ieee":"D. Li <i>et al.</i>, “In vacuum metasurface for optical microtrap array,” <i>Optics Express</i>, vol. 33, no. 24, Art. no. 51085, 2025, doi: <a href=\"https://doi.org/10.1364/oe.580201\">10.1364/oe.580201</a>.","apa":"Li, D., Liao, Q., Xu, B., Zentgraf, T., Narvaez Castaneda, E., Zhou, Y., Qin, K., Xu, Z., Shen, H., &#38; Huang, L. (2025). In vacuum metasurface for optical microtrap array. <i>Optics Express</i>, <i>33</i>(24), Article 51085. <a href=\"https://doi.org/10.1364/oe.580201\">https://doi.org/10.1364/oe.580201</a>","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={<a href=\"https://doi.org/10.1364/oe.580201\">10.1364/oe.580201</a>}, 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} }","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).","mla":"Li, Donghao, et al. “In Vacuum Metasurface for Optical Microtrap Array.” <i>Optics Express</i>, vol. 33, no. 24, 51085, Optica Publishing Group, 2025, doi:<a href=\"https://doi.org/10.1364/oe.580201\">10.1364/oe.580201</a>."},"intvolume":"        33","publication_status":"published","publication_identifier":{"issn":["1094-4087"]},"article_type":"original","article_number":"51085","_id":"62286","user_id":"30525","department":[{"_id":"15"},{"_id":"230"},{"_id":"289"},{"_id":"623"}],"status":"public","type":"journal_article"},{"year":"2025","citation":{"mla":"Kruse, Stephan, et al. <i>Optisch Basierter Digital-Analog-Umsetzer</i>. 2025.","short":"S. Kruse, C. Silberhorn, B. Brecht, T. Schwabe, (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} }","apa":"Kruse, S., Silberhorn, C., Brecht, B., &#38; Schwabe, T. (2025). <i>Optisch basierter Digital-Analog-Umsetzer</i>.","ieee":"S. Kruse, C. Silberhorn, B. Brecht, and T. Schwabe, “Optisch basierter Digital-Analog-Umsetzer.” 2025.","chicago":"Kruse, Stephan, Christine Silberhorn, Benjamin Brecht, and Tobias Schwabe. “Optisch Basierter Digital-Analog-Umsetzer,” 2025.","ama":"Kruse S, Silberhorn C, Brecht B, Schwabe T. Optisch basierter Digital-Analog-Umsetzer. Published online 2025."},"ipc":"H03M 1/66","date_updated":"2025-11-27T07:07:16Z","date_created":"2025-11-27T07:00:50Z","author":[{"last_name":"Kruse","full_name":"Kruse, Stephan","id":"38254","first_name":"Stephan"},{"first_name":"Christine","id":"26263","full_name":"Silberhorn, Christine","last_name":"Silberhorn"},{"full_name":"Brecht, Benjamin","id":"27150","last_name":"Brecht","orcid":"0000-0003-4140-0556 ","first_name":"Benjamin"},{"first_name":"Tobias","last_name":"Schwabe","full_name":"Schwabe, Tobias","id":"39217"}],"ipn":"DE102023212604B3","title":"Optisch basierter Digital-Analog-Umsetzer","type":"patent","status":"public","_id":"62639","publication_date":"2025-01-23","department":[{"_id":"58"},{"_id":"623"},{"_id":"288"}],"user_id":"38254"}]