[{"article_number":"1842","article_type":"original","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"user_id":"22501","_id":"64864","status":"public","type":"journal_article","doi":"10.1038/s41467-026-68553-7","main_file_link":[{"url":"https://www.nature.com/articles/s41467-026-68553-7","open_access":"1"}],"volume":17,"author":[{"last_name":"Rogers","full_name":"Rogers, Andrew","first_name":"Andrew"},{"full_name":"Holsgrove, Kristina","last_name":"Holsgrove","first_name":"Kristina"},{"full_name":"Schäfer, Nils A.","last_name":"Schäfer","first_name":"Nils A."},{"first_name":"Boris","full_name":"Koppitz, Boris","last_name":"Koppitz"},{"first_name":"Conor J.","last_name":"McCluskey","full_name":"McCluskey, Conor J."},{"first_name":"Shivani","full_name":"Yedama, Shivani","last_name":"Yedama"},{"first_name":"Ronan","last_name":"Lynch","full_name":"Lynch, Ronan"},{"full_name":"Sloan, Keelan","last_name":"Sloan","first_name":"Keelan"},{"full_name":"Porter, Barry","last_name":"Porter","first_name":"Barry"},{"first_name":"Adam","last_name":"Sykes","full_name":"Sykes, Adam"},{"first_name":"Alex","full_name":"Catalan Daniels, Alex","last_name":"Catalan Daniels"},{"last_name":"Silva","full_name":"Silva, Romualdo S.","first_name":"Romualdo S."},{"full_name":"Bruno, Flavio Y.","last_name":"Bruno","first_name":"Flavio Y."},{"full_name":"Seddon, Sam D.","last_name":"Seddon","first_name":"Sam D."},{"first_name":"Haidong","last_name":"Lu","full_name":"Lu, Haidong"},{"orcid":"0000-0003-4682-4577","last_name":"Rüsing","full_name":"Rüsing, Michael","id":"22501","first_name":"Michael"},{"first_name":"Christa","last_name":"Fink","full_name":"Fink, Christa"},{"last_name":"Fahler-Muenzer","full_name":"Fahler-Muenzer, Philipp","first_name":"Philipp"},{"first_name":"Sarah","last_name":"Fearn","full_name":"Fearn, Sarah"},{"first_name":"Sandrine E. M.","full_name":"Heutz, Sandrine E. M.","last_name":"Heutz"},{"first_name":"Marios","full_name":"Hadjimichael, Marios","last_name":"Hadjimichael"},{"last_name":"Ramasse","full_name":"Ramasse, Quentin M.","first_name":"Quentin M."},{"full_name":"Alexe, Marin","last_name":"Alexe","first_name":"Marin"},{"last_name":"Kumar","full_name":"Kumar, Amit","first_name":"Amit"},{"full_name":"McQuaid, Raymond G. P.","last_name":"McQuaid","first_name":"Raymond G. P."},{"full_name":"Gruverman, Alexei","last_name":"Gruverman","first_name":"Alexei"},{"first_name":"Simone","last_name":"Sanna","full_name":"Sanna, Simone"},{"first_name":"Lukas M.","last_name":"Eng","full_name":"Eng, Lukas M."},{"first_name":"J. Marty","full_name":"Gregg, J. Marty","last_name":"Gregg"}],"oa":"1","date_updated":"2026-03-08T09:22:25Z","intvolume":" 17","citation":{"bibtex":"@article{Rogers_Holsgrove_Schäfer_Koppitz_McCluskey_Yedama_Lynch_Sloan_Porter_Sykes_et al._2026, title={Polar discontinuities, emergent conductivity, and critical twist-angle-dependent behaviour at wafer-bonded ferroelectric interfaces}, volume={17}, DOI={10.1038/s41467-026-68553-7}, number={11842}, journal={Nature Communications}, publisher={Springer Science and Business Media LLC}, author={Rogers, Andrew and Holsgrove, Kristina and Schäfer, Nils A. and Koppitz, Boris and McCluskey, Conor J. and Yedama, Shivani and Lynch, Ronan and Sloan, Keelan and Porter, Barry and Sykes, Adam and et al.}, year={2026} }","mla":"Rogers, Andrew, et al. “Polar Discontinuities, Emergent Conductivity, and Critical Twist-Angle-Dependent Behaviour at Wafer-Bonded Ferroelectric Interfaces.” Nature Communications, vol. 17, no. 1, 1842, Springer Science and Business Media LLC, 2026, doi:10.1038/s41467-026-68553-7.","short":"A. Rogers, K. Holsgrove, N.A. Schäfer, B. Koppitz, C.J. McCluskey, S. Yedama, R. Lynch, K. Sloan, B. Porter, A. Sykes, A. Catalan Daniels, R.S. Silva, F.Y. Bruno, S.D. Seddon, H. Lu, M. Rüsing, C. Fink, P. Fahler-Muenzer, S. Fearn, S.E.M. Heutz, M. Hadjimichael, Q.M. Ramasse, M. Alexe, A. Kumar, R.G.P. McQuaid, A. Gruverman, S. Sanna, L.M. Eng, J.M. Gregg, Nature Communications 17 (2026).","apa":"Rogers, A., Holsgrove, K., Schäfer, N. A., Koppitz, B., McCluskey, C. J., Yedama, S., Lynch, R., Sloan, K., Porter, B., Sykes, A., Catalan Daniels, A., Silva, R. S., Bruno, F. Y., Seddon, S. D., Lu, H., Rüsing, M., Fink, C., Fahler-Muenzer, P., Fearn, S., … Gregg, J. M. (2026). Polar discontinuities, emergent conductivity, and critical twist-angle-dependent behaviour at wafer-bonded ferroelectric interfaces. Nature Communications, 17(1), Article 1842. https://doi.org/10.1038/s41467-026-68553-7","chicago":"Rogers, Andrew, Kristina Holsgrove, Nils A. Schäfer, Boris Koppitz, Conor J. McCluskey, Shivani Yedama, Ronan Lynch, et al. “Polar Discontinuities, Emergent Conductivity, and Critical Twist-Angle-Dependent Behaviour at Wafer-Bonded Ferroelectric Interfaces.” Nature Communications 17, no. 1 (2026). https://doi.org/10.1038/s41467-026-68553-7.","ieee":"A. Rogers et al., “Polar discontinuities, emergent conductivity, and critical twist-angle-dependent behaviour at wafer-bonded ferroelectric interfaces,” Nature Communications, vol. 17, no. 1, Art. no. 1842, 2026, doi: 10.1038/s41467-026-68553-7.","ama":"Rogers A, Holsgrove K, Schäfer NA, et al. Polar discontinuities, emergent conductivity, and critical twist-angle-dependent behaviour at wafer-bonded ferroelectric interfaces. Nature Communications. 2026;17(1). doi:10.1038/s41467-026-68553-7"},"publication_identifier":{"issn":["2041-1723"]},"publication_status":"published","language":[{"iso":"eng"}],"abstract":[{"text":"Probing novel properties, arising from twisted interfaces, has traditionally relied on the stacking of exfoliated two-dimensional materials and the spontaneous formation of van der Waals bonds. So far, investigations involving intimate covalent or ionic bonds have not been a focus. Yet, we show here that an established technique, involving thermocompressional wafer bonding, works well for creating twisted non-van der Waals interfaces. We have successfully bonded z-cut lithium niobate single crystals to create ferroelectric oxide interfaces with strong polar discontinuities and have mapped the associated emergent interfacial conductivity. In some instances, a dramatic change in microstructure occurs, involving local dipolar switching. A twist-induced collapse in the capability of the system to effec8tively screen interfacial bound charge is implied. Importantly, this only occurs around specific moiré twist angles with sparse coincident lattices and associated short-range aperiodicity. In quasicrystals, aperiodicity is known to induce pseudo-bandgaps and we suspect a similar phenomenon here.","lang":"eng"}],"publication":"Nature Communications","title":"Polar discontinuities, emergent conductivity, and critical twist-angle-dependent behaviour at wafer-bonded ferroelectric interfaces","date_created":"2026-03-08T09:20:13Z","publisher":"Springer Science and Business Media LLC","year":"2026","issue":"1","quality_controlled":"1"},{"title":"Toward integrated sensors for optimized optical coherence tomography with undetected photons","doi":"10.1103/cwsx-42c4","date_updated":"2026-03-25T07:59:04Z","publisher":"American Physical Society (APS)","author":[{"last_name":"Roeder","full_name":"Roeder, Franz","id":"88149","first_name":"Franz"},{"first_name":"René","last_name":"Pollmann","id":"78890","full_name":"Pollmann, René"},{"first_name":"Viktor","last_name":"Quiring","full_name":"Quiring, Viktor"},{"first_name":"Christof","full_name":"Eigner, Christof","id":"13244","orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner"},{"first_name":"Benjamin","id":"27150","full_name":"Brecht, Benjamin","orcid":"0000-0003-4140-0556 ","last_name":"Brecht"},{"last_name":"Silberhorn","id":"26263","full_name":"Silberhorn, Christine","first_name":"Christine"}],"date_created":"2026-03-23T12:28:33Z","volume":25,"year":"2026","citation":{"bibtex":"@article{Roeder_Pollmann_Quiring_Eigner_Brecht_Silberhorn_2026, title={Toward integrated sensors for optimized optical coherence tomography with undetected photons}, volume={25}, DOI={10.1103/cwsx-42c4}, number={3034031}, journal={Physical Review Applied}, publisher={American Physical Society (APS)}, author={Roeder, Franz and Pollmann, René and Quiring, Viktor and Eigner, Christof and Brecht, Benjamin and Silberhorn, Christine}, year={2026} }","short":"F. Roeder, R. Pollmann, V. Quiring, C. Eigner, B. Brecht, C. Silberhorn, Physical Review Applied 25 (2026).","mla":"Roeder, Franz, et al. “Toward Integrated Sensors for Optimized Optical Coherence Tomography with Undetected Photons.” Physical Review Applied, vol. 25, no. 3, 034031, American Physical Society (APS), 2026, doi:10.1103/cwsx-42c4.","apa":"Roeder, F., Pollmann, R., Quiring, V., Eigner, C., Brecht, B., & Silberhorn, C. (2026). Toward integrated sensors for optimized optical coherence tomography with undetected photons. Physical Review Applied, 25(3), Article 034031. https://doi.org/10.1103/cwsx-42c4","ieee":"F. Roeder, R. Pollmann, V. Quiring, C. Eigner, B. Brecht, and C. Silberhorn, “Toward integrated sensors for optimized optical coherence tomography with undetected photons,” Physical Review Applied, vol. 25, no. 3, Art. no. 034031, 2026, doi: 10.1103/cwsx-42c4.","chicago":"Roeder, Franz, René Pollmann, Viktor Quiring, Christof Eigner, Benjamin Brecht, and Christine Silberhorn. “Toward Integrated Sensors for Optimized Optical Coherence Tomography with Undetected Photons.” Physical Review Applied 25, no. 3 (2026). https://doi.org/10.1103/cwsx-42c4.","ama":"Roeder F, Pollmann R, Quiring V, Eigner C, Brecht B, Silberhorn C. Toward integrated sensors for optimized optical coherence tomography with undetected photons. Physical Review Applied. 2026;25(3). doi:10.1103/cwsx-42c4"},"intvolume":" 25","publication_status":"published","publication_identifier":{"issn":["2331-7019"]},"issue":"3","article_number":"034031","language":[{"iso":"eng"}],"_id":"65094","user_id":"27150","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"abstract":[{"text":"\r\n The development of practical sensors for optical coherence tomography (OCT) with undetected photons requires miniaturization via integration. To be practical, these sensors must exhibit a large spectral bandwidth and a high brightness, which are linked to a high axial resolution and a sufficient signal-to-noise ratio, respectively. Here, we combine these requirements in a scheme for OCT measurements with undetected photons based on nonlinear\r\n \r\n Ti\r\n :\r\n \r\n \r\n Li\r\n Nb\r\n O\r\n \r\n 3\r\n \r\n \r\n waveguides. We investigate the performance benchmarks of the commonly used SU(1,1) scheme in comparison to an induced-coherence scheme and find that the latter is actually better suited when implementing measurements with undetected photons in integrated systems. In both schemes, we perform pump-gain optimization and OCT measurements with undetected photons with an axial resolution as low as\r\n \r\n 28\r\n \r\n μ\r\n \r\n m\r\n \r\n \r\n .\r\n ","lang":"eng"}],"status":"public","type":"journal_article","publication":"Physical Review Applied"},{"publication":"Optica","abstract":[{"text":"\r\n Precise measurements of both the arrival time and carrier frequency of light pulses are essential for time–frequency-encoded quantum technologies. Quantum mechanics, however, imposes fundamental limits on the simultaneous determination of these quantities. In this work, we derive and experimentally verify the quantum uncertainty bounds governing joint time–frequency measurements. We show that when detection is restricted to finite time windows, the problem is naturally described by a quantum rotor, rendering the commonly used Heisenberg uncertainty relation inapplicable. We further propose an optimal detection scheme that saturates these fundamental limits. By sampling the\r\n Q\r\n -function, we demonstrate the reconstruction of the Wigner function beyond the harmonic oscillator. Using an experimental implementation based on a quantum pulse gate, we confirm that the proposed scheme approaches the ultimate quantum limit for simultaneous time–frequency measurements. These results provide a framework for joint time–frequency detection with direct implications for precision measurements and quantum information processing.\r\n ","lang":"eng"}],"language":[{"iso":"eng"}],"issue":"3","year":"2026","date_created":"2026-03-23T12:30:02Z","publisher":"Optica Publishing Group","title":"Quantum-limited detection of the arrival time and the carrier frequency of time-dependent signals","type":"journal_article","status":"public","user_id":"27150","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"_id":"65096","article_number":"548","publication_status":"published","publication_identifier":{"issn":["2334-2536"]},"citation":{"ama":"Folge PF, Serino LM, Mišta L, et al. Quantum-limited detection of the arrival time and the carrier frequency of time-dependent signals. Optica. 2026;13(3). doi:10.1364/optica.579459","ieee":"P. F. Folge et al., “Quantum-limited detection of the arrival time and the carrier frequency of time-dependent signals,” Optica, vol. 13, no. 3, Art. no. 548, 2026, doi: 10.1364/optica.579459.","chicago":"Folge, Patrick Fabian, Laura Maria Serino, Ladislav Mišta, Benjamin Brecht, Christine Silberhorn, Jaroslav Řeháček, and Zdeněk Hradil. “Quantum-Limited Detection of the Arrival Time and the Carrier Frequency of Time-Dependent Signals.” Optica 13, no. 3 (2026). https://doi.org/10.1364/optica.579459.","short":"P.F. Folge, L.M. Serino, L. Mišta, B. Brecht, C. Silberhorn, J. Řeháček, Z. Hradil, Optica 13 (2026).","mla":"Folge, Patrick Fabian, et al. “Quantum-Limited Detection of the Arrival Time and the Carrier Frequency of Time-Dependent Signals.” Optica, vol. 13, no. 3, 548, Optica Publishing Group, 2026, doi:10.1364/optica.579459.","bibtex":"@article{Folge_Serino_Mišta_Brecht_Silberhorn_Řeháček_Hradil_2026, title={Quantum-limited detection of the arrival time and the carrier frequency of time-dependent signals}, volume={13}, DOI={10.1364/optica.579459}, number={3548}, journal={Optica}, publisher={Optica Publishing Group}, author={Folge, Patrick Fabian and Serino, Laura Maria and Mišta, Ladislav and Brecht, Benjamin and Silberhorn, Christine and Řeháček, Jaroslav and Hradil, Zdeněk}, year={2026} }","apa":"Folge, P. F., Serino, L. M., Mišta, L., Brecht, B., Silberhorn, C., Řeháček, J., & Hradil, Z. (2026). Quantum-limited detection of the arrival time and the carrier frequency of time-dependent signals. Optica, 13(3), Article 548. https://doi.org/10.1364/optica.579459"},"intvolume":" 13","author":[{"first_name":"Patrick Fabian","last_name":"Folge","id":"88605","full_name":"Folge, Patrick Fabian"},{"last_name":"Serino","full_name":"Serino, Laura Maria","id":"88242","first_name":"Laura Maria"},{"last_name":"Mišta","full_name":"Mišta, Ladislav","first_name":"Ladislav"},{"first_name":"Benjamin","id":"27150","full_name":"Brecht, Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 "},{"last_name":"Silberhorn","id":"26263","full_name":"Silberhorn, Christine","first_name":"Christine"},{"full_name":"Řeháček, Jaroslav","last_name":"Řeháček","first_name":"Jaroslav"},{"full_name":"Hradil, Zdeněk","last_name":"Hradil","first_name":"Zdeněk"}],"volume":13,"date_updated":"2026-03-25T07:59:23Z","doi":"10.1364/optica.579459"},{"language":[{"iso":"eng"}],"abstract":[{"text":"Superconducting nanowire single-photon detectors (SNSPDs) can enable photon-number resolution (PNR) based on accurate measurements of the detector’s response time to few-photon optical pulses. In this work, we investigate the impact of the optical pulse shape and duration on the accuracy of this method. We find that Gaussian temporal pulse shapes yield cleaner arrival-time histograms and, thus, more accurate PNR, compared to bandpass-filtered pulses of equal bandwidth. For low system jitter and an optical pulse duration comparable to the other jitter contributions, photon numbers can be discriminated in our system with a commercial SNSPD. At 60 ps optical pulse duration, photon-number discrimination is significantly reduced. Furthermore, we highlight the importance of using the correct arrival-time histogram model when analyzing photon-number assignment. Using exponentially modified Gaussian distributions, instead of the commonly used Gaussian distributions, we can more accurately determine photon-number misidentification probabilities. Finally, we reconstruct the positive operator-valued measures of the detector, revealing sharp features that indicate the intrinsic PNR capabilities.","lang":"eng"}],"publication":"APL Quantum","title":"Practical considerations for assignment of photon numbers with SNSPDs","publisher":"AIP Publishing","date_created":"2026-01-05T10:00:58Z","year":"2026","issue":"1","article_number":"016102","project":[{"_id":"191","name":"PhoQuant: Photonische Quantencomputer - Quantencomputing Testplattform"},{"name":"ERC-Grant: QuESADILLA: Quantum Engineering Superconducting Array Detectors in Low-Light Applications","_id":"239"}],"_id":"63451","user_id":"27150","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"status":"public","type":"journal_article","main_file_link":[{"open_access":"1"}],"doi":"10.1063/5.0304127","oa":"1","date_updated":"2026-03-25T08:00:27Z","author":[{"full_name":"Schapeler, Timon","id":"55629","orcid":"0000-0001-7652-1716","last_name":"Schapeler","first_name":"Timon"},{"full_name":"Mischke, Isabell","last_name":"Mischke","first_name":"Isabell"},{"first_name":"Fabian","last_name":"Schlue","full_name":"Schlue, Fabian","id":"63579"},{"first_name":"Michael","id":"42777","full_name":"Stefszky, Michael","last_name":"Stefszky"},{"last_name":"Brecht","orcid":"0000-0003-4140-0556 ","id":"27150","full_name":"Brecht, Benjamin","first_name":"Benjamin"},{"first_name":"Christine","id":"26263","full_name":"Silberhorn, Christine","last_name":"Silberhorn"},{"first_name":"Tim","full_name":"Bartley, Tim","id":"49683","last_name":"Bartley"}],"volume":3,"citation":{"chicago":"Schapeler, Timon, Isabell Mischke, Fabian Schlue, Michael Stefszky, Benjamin Brecht, Christine Silberhorn, and Tim Bartley. “Practical Considerations for Assignment of Photon Numbers with SNSPDs.” APL Quantum 3, no. 1 (2026). https://doi.org/10.1063/5.0304127.","ieee":"T. Schapeler et al., “Practical considerations for assignment of photon numbers with SNSPDs,” APL Quantum, vol. 3, no. 1, Art. no. 016102, 2026, doi: 10.1063/5.0304127.","ama":"Schapeler T, Mischke I, Schlue F, et al. Practical considerations for assignment of photon numbers with SNSPDs. APL Quantum. 2026;3(1). doi:10.1063/5.0304127","apa":"Schapeler, T., Mischke, I., Schlue, F., Stefszky, M., Brecht, B., Silberhorn, C., & Bartley, T. (2026). Practical considerations for assignment of photon numbers with SNSPDs. APL Quantum, 3(1), Article 016102. https://doi.org/10.1063/5.0304127","short":"T. Schapeler, I. Mischke, F. Schlue, M. Stefszky, B. Brecht, C. Silberhorn, T. Bartley, APL Quantum 3 (2026).","bibtex":"@article{Schapeler_Mischke_Schlue_Stefszky_Brecht_Silberhorn_Bartley_2026, title={Practical considerations for assignment of photon numbers with SNSPDs}, volume={3}, DOI={10.1063/5.0304127}, number={1016102}, journal={APL Quantum}, publisher={AIP Publishing}, author={Schapeler, Timon and Mischke, Isabell and Schlue, Fabian and Stefszky, Michael and Brecht, Benjamin and Silberhorn, Christine and Bartley, Tim}, year={2026} }","mla":"Schapeler, Timon, et al. “Practical Considerations for Assignment of Photon Numbers with SNSPDs.” APL Quantum, vol. 3, no. 1, 016102, AIP Publishing, 2026, doi:10.1063/5.0304127."},"intvolume":" 3","publication_status":"published","publication_identifier":{"issn":["2835-0103"]}},{"date_updated":"2026-03-25T07:59:36Z","publisher":"American Physical Society (APS)","author":[{"full_name":"Serino, Laura Maria","id":"88242","last_name":"Serino","first_name":"Laura Maria"},{"first_name":"Giovanni","full_name":"Chesi, Giovanni","last_name":"Chesi"},{"last_name":"Brecht","orcid":"0000-0003-4140-0556 ","id":"27150","full_name":"Brecht, Benjamin","first_name":"Benjamin"},{"first_name":"Lorenzo","last_name":"Maccone","full_name":"Maccone, Lorenzo"},{"last_name":"Macchiavello","full_name":"Macchiavello, Chiara","first_name":"Chiara"},{"first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263","last_name":"Silberhorn"}],"date_created":"2026-03-23T12:29:23Z","volume":113,"title":"Experimental entropic uncertainty relations in dimensions three to five","doi":"10.1103/f6c4-jtlc","publication_status":"published","publication_identifier":{"issn":["2469-9926","2469-9934"]},"issue":"3","year":"2026","citation":{"ieee":"L. M. Serino, G. Chesi, B. Brecht, L. Maccone, C. Macchiavello, and C. Silberhorn, “Experimental entropic uncertainty relations in dimensions three to five,” Physical Review A, vol. 113, no. 3, Art. no. 032420, 2026, doi: 10.1103/f6c4-jtlc.","chicago":"Serino, Laura Maria, Giovanni Chesi, Benjamin Brecht, Lorenzo Maccone, Chiara Macchiavello, and Christine Silberhorn. “Experimental Entropic Uncertainty Relations in Dimensions Three to Five.” Physical Review A 113, no. 3 (2026). https://doi.org/10.1103/f6c4-jtlc.","short":"L.M. Serino, G. Chesi, B. Brecht, L. Maccone, C. Macchiavello, C. Silberhorn, Physical Review A 113 (2026).","bibtex":"@article{Serino_Chesi_Brecht_Maccone_Macchiavello_Silberhorn_2026, title={Experimental entropic uncertainty relations in dimensions three to five}, volume={113}, DOI={10.1103/f6c4-jtlc}, number={3032420}, journal={Physical Review A}, publisher={American Physical Society (APS)}, author={Serino, Laura Maria and Chesi, Giovanni and Brecht, Benjamin and Maccone, Lorenzo and Macchiavello, Chiara and Silberhorn, Christine}, year={2026} }","mla":"Serino, Laura Maria, et al. “Experimental Entropic Uncertainty Relations in Dimensions Three to Five.” Physical Review A, vol. 113, no. 3, 032420, American Physical Society (APS), 2026, doi:10.1103/f6c4-jtlc.","ama":"Serino LM, Chesi G, Brecht B, Maccone L, Macchiavello C, Silberhorn C. Experimental entropic uncertainty relations in dimensions three to five. Physical Review A. 2026;113(3). doi:10.1103/f6c4-jtlc","apa":"Serino, L. M., Chesi, G., Brecht, B., Maccone, L., Macchiavello, C., & Silberhorn, C. (2026). Experimental entropic uncertainty relations in dimensions three to five. Physical Review A, 113(3), Article 032420. https://doi.org/10.1103/f6c4-jtlc"},"intvolume":" 113","_id":"65095","user_id":"27150","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"article_number":"032420","language":[{"iso":"eng"}],"type":"journal_article","publication":"Physical Review A","abstract":[{"text":"\r\n We provide experimental validation of tight entropic uncertainty relations for the Shannon entropies of observables with mutually unbiased eigenstates in high dimensions. In particular, we address the cases of dimensions\r\n \r\n \r\n d\r\n =\r\n 3\r\n \r\n \r\n , 4, and 5 and consider from 2 to\r\n \r\n \r\n d\r\n +\r\n 1\r\n \r\n \r\n mutually unbiased bases. The experiment is based on pulsed frequency bins measured with a multioutput quantum pulse gate, which can perform projective measurements on a complete high-dimensional basis in the time-frequency domain. Our results fit the theoretical predictions: the bound on the sum of the entropies is never violated and is saturated by the states that minimize the uncertainty relations.\r\n ","lang":"eng"}],"status":"public"},{"status":"public","type":"journal_article","article_type":"original","department":[{"_id":"623"},{"_id":"288"},{"_id":"15"}],"user_id":"106751","_id":"63734","intvolume":" 14","page":"1775-1782","citation":{"ieee":"S. Kapoor et al., “Electro-optic frequency shift of single photons from a quantum dot,” Nanophotonics, vol. 14, no. 11, pp. 1775–1782, 2025, doi: 10.1515/nanoph-2024-0550.","chicago":"Kapoor, Sanjay, Aleksander Rodek, Michał Mikołajczyk, Jerzy Szuniewicz, Filip Maksymilian Sośnicki, Tomasz Kazimierczuk, Piotr Kossacki, and Michał Karpiński. “Electro-Optic Frequency Shift of Single Photons from a Quantum Dot.” Nanophotonics 14, no. 11 (2025): 1775–82. https://doi.org/10.1515/nanoph-2024-0550.","ama":"Kapoor S, Rodek A, Mikołajczyk M, et al. Electro-optic frequency shift of single photons from a quantum dot. Nanophotonics. 2025;14(11):1775-1782. doi:10.1515/nanoph-2024-0550","mla":"Kapoor, Sanjay, et al. “Electro-Optic Frequency Shift of Single Photons from a Quantum Dot.” Nanophotonics, vol. 14, no. 11, Walter de Gruyter GmbH, 2025, pp. 1775–82, doi:10.1515/nanoph-2024-0550.","bibtex":"@article{Kapoor_Rodek_Mikołajczyk_Szuniewicz_Sośnicki_Kazimierczuk_Kossacki_Karpiński_2025, title={Electro-optic frequency shift of single photons from a quantum dot}, volume={14}, DOI={10.1515/nanoph-2024-0550}, number={11}, journal={Nanophotonics}, publisher={Walter de Gruyter GmbH}, author={Kapoor, Sanjay and Rodek, Aleksander and Mikołajczyk, Michał and Szuniewicz, Jerzy and Sośnicki, Filip Maksymilian and Kazimierczuk, Tomasz and Kossacki, Piotr and Karpiński, Michał}, year={2025}, pages={1775–1782} }","short":"S. Kapoor, A. Rodek, M. Mikołajczyk, J. Szuniewicz, F.M. Sośnicki, T. Kazimierczuk, P. Kossacki, M. Karpiński, Nanophotonics 14 (2025) 1775–1782.","apa":"Kapoor, S., Rodek, A., Mikołajczyk, M., Szuniewicz, J., Sośnicki, F. M., Kazimierczuk, T., Kossacki, P., & Karpiński, M. (2025). Electro-optic frequency shift of single photons from a quantum dot. Nanophotonics, 14(11), 1775–1782. https://doi.org/10.1515/nanoph-2024-0550"},"publication_identifier":{"issn":["2192-8614"]},"publication_status":"published","doi":"10.1515/nanoph-2024-0550","main_file_link":[{"url":"https://www.degruyterbrill.com/document/doi/10.1515/nanoph-2024-0550/html"}],"volume":14,"author":[{"first_name":"Sanjay","last_name":"Kapoor","full_name":"Kapoor, Sanjay"},{"last_name":"Rodek","full_name":"Rodek, Aleksander","first_name":"Aleksander"},{"first_name":"Michał","last_name":"Mikołajczyk","full_name":"Mikołajczyk, Michał"},{"full_name":"Szuniewicz, Jerzy","last_name":"Szuniewicz","first_name":"Jerzy"},{"first_name":"Filip Maksymilian","last_name":"Sośnicki","orcid":"0000-0002-2465-4645","id":"106751","full_name":"Sośnicki, Filip Maksymilian"},{"full_name":"Kazimierczuk, Tomasz","last_name":"Kazimierczuk","first_name":"Tomasz"},{"last_name":"Kossacki","full_name":"Kossacki, Piotr","first_name":"Piotr"},{"full_name":"Karpiński, Michał","last_name":"Karpiński","first_name":"Michał"}],"date_updated":"2026-01-26T14:35:42Z","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"}],"publication":"Nanophotonics","language":[{"iso":"eng"}],"year":"2025","issue":"11","title":"Electro-optic frequency shift of single photons from a quantum dot","date_created":"2026-01-26T14:34:16Z","publisher":"Walter de Gruyter GmbH"},{"department":[{"_id":"623"},{"_id":"288"},{"_id":"15"}],"user_id":"106751","_id":"63732","article_type":"original","article_number":"096111","type":"journal_article","status":"public","volume":10,"author":[{"first_name":"Sanjay","full_name":"Kapoor, Sanjay","last_name":"Kapoor"},{"last_name":"Sośnicki","orcid":"0000-0002-2465-4645","full_name":"Sośnicki, Filip Maksymilian","id":"106751","first_name":"Filip Maksymilian"},{"full_name":"Karpiński, Michał","last_name":"Karpiński","first_name":"Michał"}],"date_updated":"2026-01-26T14:27:42Z","doi":"10.1063/5.0270904","main_file_link":[{"url":"https://pubs.aip.org/aip/app/article/10/9/096111/3364187"}],"publication_identifier":{"issn":["2378-0967"]},"publication_status":"published","intvolume":" 10","citation":{"ama":"Kapoor S, Sośnicki FM, Karpiński M. Aberration-optimized electro-optic time lens model using a tunable aperture. APL Photonics. 2025;10(9). doi:10.1063/5.0270904","ieee":"S. Kapoor, F. M. Sośnicki, and M. Karpiński, “Aberration-optimized electro-optic time lens model using a tunable aperture,” APL Photonics, vol. 10, no. 9, Art. no. 096111, 2025, doi: 10.1063/5.0270904.","chicago":"Kapoor, Sanjay, Filip Maksymilian Sośnicki, and Michał Karpiński. “Aberration-Optimized Electro-Optic Time Lens Model Using a Tunable Aperture.” APL Photonics 10, no. 9 (2025). https://doi.org/10.1063/5.0270904.","bibtex":"@article{Kapoor_Sośnicki_Karpiński_2025, title={Aberration-optimized electro-optic time lens model using a tunable aperture}, volume={10}, DOI={10.1063/5.0270904}, number={9096111}, journal={APL Photonics}, publisher={AIP Publishing}, author={Kapoor, Sanjay and Sośnicki, Filip Maksymilian and Karpiński, Michał}, year={2025} }","mla":"Kapoor, Sanjay, et al. “Aberration-Optimized Electro-Optic Time Lens Model Using a Tunable Aperture.” APL Photonics, vol. 10, no. 9, 096111, AIP Publishing, 2025, doi:10.1063/5.0270904.","short":"S. Kapoor, F.M. Sośnicki, M. Karpiński, APL Photonics 10 (2025).","apa":"Kapoor, S., Sośnicki, F. M., & Karpiński, M. (2025). Aberration-optimized electro-optic time lens model using a tunable aperture. APL Photonics, 10(9), Article 096111. https://doi.org/10.1063/5.0270904"},"language":[{"iso":"eng"}],"publication":"APL Photonics","abstract":[{"lang":"eng","text":"Time lenses have been recognized as crucial components for manipulating ultrafast optical pulses in various applications, from ultrafast spectroscopy to the interfacing of optical quantum systems. A time lens is characterized by its chirp rate, which determines the focusing strength of the time lens, and accurate knowledge of this chirp is critical for precise dispersion compensation and minimizing aberrations. Here, we introduce a tunable time aperture model for sinusoidal time lenses that provides a more accurate estimate of the effective chirp rate without modifying the device. We derive a closed-form expression for the maximum phase error and show how it depends on the time aperture. We experimentally demonstrate a 1.6-fold improvement in spectral bandwidth compression of Gaussian pulses compared to the conventional approach. Our framework offers a practical tool for designing efficient temporal optical systems, benefiting applications in both classical and quantum optics where accurate spectro-temporal shaping is essential."}],"date_created":"2026-01-26T14:24:34Z","publisher":"AIP Publishing","title":"Aberration-optimized electro-optic time lens model using a tunable aperture","issue":"9","year":"2025"},{"publication":"Optics Continuum","type":"journal_article","status":"public","abstract":[{"text":"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 LiNbO3. 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 <0.4dBcm and a SHG conversion efficiency of about 81%Wcm2. Harnessing a type-0 SPDC process to generate 1550 nm photons, we obtain a SPDC brightness of 3⋅1051s⋅mW⋅nm, with a heralding efficiency of ηh=45% (ηh,wg=77.5% for the waveguide itself excluded setup losses) and a heralded second-order correlation function of gh2(0)<0.003 at low pump powers.","lang":"eng"}],"department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"user_id":"216","_id":"59069","language":[{"iso":"eng"}],"article_number":"593","article_type":"original","issue":"3","publication_identifier":{"issn":["2770-0208"]},"publication_status":"published","intvolume":" 4","citation":{"apa":"Kießler, C., Kirsch, M., Lengeling, S., Herrmann, H., & Silberhorn, C. (2025). SPDC single-photon source in Ti-indiffused diced ridge LiNbO3 waveguides. Optics Continuum, 4(3), Article 593. https://doi.org/10.1364/optcon.557439","bibtex":"@article{Kießler_Kirsch_Lengeling_Herrmann_Silberhorn_2025, title={SPDC single-photon source in Ti-indiffused diced ridge LiNbO3 waveguides}, volume={4}, DOI={10.1364/optcon.557439}, 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} }","mla":"Kießler, Christian, et al. “SPDC Single-Photon Source in Ti-Indiffused Diced Ridge LiNbO3 Waveguides.” Optics Continuum, vol. 4, no. 3, 593, Optica Publishing Group, 2025, doi:10.1364/optcon.557439.","short":"C. Kießler, M. Kirsch, S. Lengeling, H. Herrmann, C. Silberhorn, Optics Continuum 4 (2025).","chicago":"Kießler, Christian, Michelle Kirsch, Sebastian Lengeling, Harald Herrmann, and Christine Silberhorn. “SPDC Single-Photon Source in Ti-Indiffused Diced Ridge LiNbO3 Waveguides.” Optics Continuum 4, no. 3 (2025). https://doi.org/10.1364/optcon.557439.","ieee":"C. Kießler, M. Kirsch, S. Lengeling, H. Herrmann, and C. Silberhorn, “SPDC single-photon source in Ti-indiffused diced ridge LiNbO3 waveguides,” Optics Continuum, vol. 4, no. 3, Art. no. 593, 2025, doi: 10.1364/optcon.557439.","ama":"Kießler C, Kirsch M, Lengeling S, Herrmann H, Silberhorn C. SPDC single-photon source in Ti-indiffused diced ridge LiNbO3 waveguides. Optics Continuum. 2025;4(3). doi:10.1364/optcon.557439"},"year":"2025","volume":4,"author":[{"first_name":"Christian","id":"44252","full_name":"Kießler, Christian","last_name":"Kießler"},{"first_name":"Michelle","last_name":"Kirsch","full_name":"Kirsch, Michelle","id":"69553"},{"first_name":"Sebastian","full_name":"Lengeling, Sebastian","id":"44373","last_name":"Lengeling"},{"first_name":"Harald","id":"216","full_name":"Herrmann, Harald","last_name":"Herrmann"},{"first_name":"Christine","last_name":"Silberhorn","id":"26263","full_name":"Silberhorn, Christine"}],"date_created":"2025-03-19T10:56:04Z","date_updated":"2025-03-19T16:03:25Z","publisher":"Optica Publishing Group","doi":"10.1364/optcon.557439","title":"SPDC single-photon source in Ti-indiffused diced ridge LiNbO3 waveguides"},{"date_updated":"2025-04-02T16:24:47Z","publisher":"American Physical Society (APS)","volume":111,"date_created":"2025-04-02T16:21:47Z","author":[{"last_name":"Pionteck","full_name":"Pionteck, Mike N.","first_name":"Mike N."},{"first_name":"Matthias","full_name":"Roeper, Matthias","last_name":"Roeper"},{"full_name":"Koppitz, Boris","last_name":"Koppitz","first_name":"Boris"},{"first_name":"Samuel D.","last_name":"Seddon","full_name":"Seddon, Samuel D."},{"full_name":"Rüsing, Michael","id":"22501","last_name":"Rüsing","orcid":"0000-0003-4682-4577","first_name":"Michael"},{"id":"40300","full_name":"Padberg, Laura","last_name":"Padberg","first_name":"Laura"},{"first_name":"Christof","orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner","id":"13244","full_name":"Eigner, Christof"},{"first_name":"Christine","last_name":"Silberhorn","id":"26263","full_name":"Silberhorn, Christine"},{"full_name":"Sanna, Simone","last_name":"Sanna","first_name":"Simone"},{"full_name":"Eng, Lukas M.","last_name":"Eng","first_name":"Lukas M."}],"title":"Second-order nonlinear piezo-optic properties of single crystal lithium niobate thin films","doi":"10.1103/physrevb.111.064109","quality_controlled":"1","publication_identifier":{"issn":["2469-9950","2469-9969"]},"publication_status":"published","issue":"6","year":"2025","intvolume":" 111","citation":{"ama":"Pionteck MN, Roeper M, Koppitz B, et al. Second-order nonlinear piezo-optic properties of single crystal lithium niobate thin films. Physical Review B. 2025;111(6). doi:10.1103/physrevb.111.064109","ieee":"M. N. Pionteck et al., “Second-order nonlinear piezo-optic properties of single crystal lithium niobate thin films,” Physical Review B, vol. 111, no. 6, Art. no. 064109, 2025, doi: 10.1103/physrevb.111.064109.","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.” Physical Review B 111, no. 6 (2025). https://doi.org/10.1103/physrevb.111.064109.","apa":"Pionteck, M. N., Roeper, M., Koppitz, B., Seddon, S. D., Rüsing, M., Padberg, L., Eigner, C., Silberhorn, C., Sanna, S., & Eng, L. M. (2025). Second-order nonlinear piezo-optic properties of single crystal lithium niobate thin films. Physical Review B, 111(6), Article 064109. https://doi.org/10.1103/physrevb.111.064109","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={10.1103/physrevb.111.064109}, 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} }","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).","mla":"Pionteck, Mike N., et al. “Second-Order Nonlinear Piezo-Optic Properties of Single Crystal Lithium Niobate Thin Films.” Physical Review B, vol. 111, no. 6, 064109, American Physical Society (APS), 2025, doi:10.1103/physrevb.111.064109."},"_id":"59276","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"user_id":"22501","article_number":"064109","language":[{"iso":"eng"}],"publication":"Physical Review B","type":"journal_article","abstract":[{"lang":"eng","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 x or y crystallographic axes is observed by the appearance of new nonlinear optical tensor elements within the strained crystals."}],"status":"public"},{"issue":"5","publication_status":"published","publication_identifier":{"issn":["2334-2536"]},"citation":{"bibtex":"@article{Thiele_Lamberty_Hummel_Lange_Procopio Peña_Barua_Lengeling_Quiring_Eigner_Silberhorn_et al._2025, title={Cryogenic feedforward of a photonic quantum state}, volume={12}, DOI={10.1364/optica.551287}, number={5720}, journal={Optica}, publisher={Optica Publishing Group}, author={Thiele, Frederik and Lamberty, Niklas and Hummel, Thomas and Lange, Nina Amelie and Procopio Peña, Lorenzo Manuel and Barua, Aishi and Lengeling, Sebastian and Quiring, Viktor and Eigner, Christof and Silberhorn, Christine and et al.}, year={2025} }","short":"F. Thiele, N. Lamberty, T. Hummel, N.A. Lange, L.M. Procopio Peña, A. Barua, S. Lengeling, V. Quiring, C. Eigner, C. Silberhorn, T. Bartley, Optica 12 (2025).","mla":"Thiele, Frederik, et al. “Cryogenic Feedforward of a Photonic Quantum State.” Optica, vol. 12, no. 5, 720, Optica Publishing Group, 2025, doi:10.1364/optica.551287.","apa":"Thiele, F., Lamberty, N., Hummel, T., Lange, N. A., Procopio Peña, L. M., Barua, A., Lengeling, S., Quiring, V., Eigner, C., Silberhorn, C., & Bartley, T. (2025). Cryogenic feedforward of a photonic quantum state. Optica, 12(5), Article 720. https://doi.org/10.1364/optica.551287","ama":"Thiele F, Lamberty N, Hummel T, et al. Cryogenic feedforward of a photonic quantum state. Optica. 2025;12(5). doi:10.1364/optica.551287","chicago":"Thiele, Frederik, Niklas Lamberty, Thomas Hummel, Nina Amelie Lange, Lorenzo Manuel Procopio Peña, Aishi Barua, Sebastian Lengeling, et al. “Cryogenic Feedforward of a Photonic Quantum State.” Optica 12, no. 5 (2025). https://doi.org/10.1364/optica.551287.","ieee":"F. Thiele et al., “Cryogenic feedforward of a photonic quantum state,” Optica, vol. 12, no. 5, Art. no. 720, 2025, doi: 10.1364/optica.551287."},"intvolume":" 12","year":"2025","date_created":"2025-06-04T18:34:16Z","author":[{"id":"50819","full_name":"Thiele, Frederik","last_name":"Thiele","orcid":"0000-0003-0663-5587","first_name":"Frederik"},{"last_name":"Lamberty","id":"75307","full_name":"Lamberty, Niklas","first_name":"Niklas"},{"first_name":"Thomas","last_name":"Hummel","orcid":"0000-0001-8627-2119","full_name":"Hummel, Thomas","id":"83846"},{"first_name":"Nina Amelie","full_name":"Lange, Nina Amelie","id":"56843","last_name":"Lange","orcid":"0000-0001-6624-7098"},{"full_name":"Procopio Peña, Lorenzo Manuel","id":"105816","last_name":"Procopio Peña","first_name":"Lorenzo Manuel"},{"full_name":"Barua, Aishi","id":"104502","last_name":"Barua","first_name":"Aishi"},{"last_name":"Lengeling","id":"44373","full_name":"Lengeling, Sebastian","first_name":"Sebastian"},{"last_name":"Quiring","full_name":"Quiring, Viktor","first_name":"Viktor"},{"first_name":"Christof","full_name":"Eigner, Christof","id":"13244","orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner"},{"last_name":"Silberhorn","id":"26263","full_name":"Silberhorn, Christine","first_name":"Christine"},{"first_name":"Tim","full_name":"Bartley, Tim","id":"49683","last_name":"Bartley"}],"volume":12,"publisher":"Optica Publishing Group","date_updated":"2025-06-12T09:56:47Z","doi":"10.1364/optica.551287","title":"Cryogenic feedforward of a photonic quantum state","type":"journal_article","publication":"Optica","status":"public","abstract":[{"text":"Modulation conditioned on measurements on entangled photonic quantum states is a cornerstone technology of optical quantum information processing. Performing this task with low latency requires combining single-photon-level detectors with both electronic logic processing and optical modulation in close proximity. Here, we demonstrate low-latency feedforward using a quasi-photon-number-resolved measurement on a quantum light source. Specifically, we use a multipixel superconducting nanowire single-photon detector, amplifier, logic, and an integrated electro-optic modulator in situ below 4 K. We modulate the signal mode of a spontaneous parametric down-conversion source, conditional on a photon-number measurement of the idler mode, with a total latency of (23±3)ns. Furthermore, we investigate the resulting change in the photon statistics. This represents an important benchmark for the fastest quantum photonic feedforward experiments comprising measurement, amplification, logic, and modulation. This has direct applications in quantum computing, communication, and simulation protocols.","lang":"eng"}],"user_id":"56843","_id":"60136","language":[{"iso":"eng"}],"article_number":"720"},{"type":"conference","publication":"Advanced Photon Counting Techniques XIX","status":"public","editor":[{"full_name":"Itzler, Mark A.","last_name":"Itzler","first_name":"Mark A."},{"last_name":"McIntosh","full_name":"McIntosh, K. Alex","first_name":"K. Alex"},{"first_name":"Joshua C.","last_name":"Bienfang","full_name":"Bienfang, Joshua C."}],"user_id":"55629","department":[{"_id":"15"},{"_id":"623"}],"project":[{"_id":"239","name":"QuESADILLA: ERC-Grant: QuESADILLA: Quantum Engineering Superconducting Array Detectors in Low-Light Applications","grant_number":"101042399","call_identifier":"ERC"},{"grant_number":"13N16103","name":"PhoQuant--QCTest: PhoQuant: Photonische Quantencomputer - Quantencomputing Testplattform","_id":"191"}],"_id":"60587","language":[{"iso":"eng"}],"publication_status":"published","citation":{"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 Advanced Photon Counting Techniques XIX, 2025, doi: 10.1117/12.3054905.","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 Advanced Photon Counting Techniques XIX, edited by Mark A. Itzler, K. Alex McIntosh, and Joshua C. Bienfang. SPIE, 2025. https://doi.org/10.1117/12.3054905.","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. Advanced Photon Counting Techniques XIX. SPIE; 2025. doi:10.1117/12.3054905","apa":"Schapeler, T., Schlue, F., Stefszky, M., Brecht, B., Silberhorn, C., & Bartley, T. (2025). Optimizing photon-number resolution with superconducting nanowire multi-photon detectors. In M. A. Itzler, K. A. McIntosh, & J. C. Bienfang (Eds.), Advanced Photon Counting Techniques XIX. SPIE. https://doi.org/10.1117/12.3054905","bibtex":"@inproceedings{Schapeler_Schlue_Stefszky_Brecht_Silberhorn_Bartley_2025, title={Optimizing photon-number resolution with superconducting nanowire multi-photon detectors}, DOI={10.1117/12.3054905}, 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} }","mla":"Schapeler, Timon, et al. “Optimizing Photon-Number Resolution with Superconducting Nanowire Multi-Photon Detectors.” Advanced Photon Counting Techniques XIX, edited by Mark A. Itzler et al., SPIE, 2025, doi:10.1117/12.3054905.","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."},"year":"2025","date_created":"2025-07-11T09:18:09Z","author":[{"first_name":"Timon","full_name":"Schapeler, Timon","id":"55629","last_name":"Schapeler","orcid":"0000-0001-7652-1716"},{"first_name":"Fabian","full_name":"Schlue, Fabian","id":"63579","last_name":"Schlue"},{"first_name":"Michael","full_name":"Stefszky, Michael","id":"42777","last_name":"Stefszky"},{"full_name":"Brecht, Benjamin","id":"27150","orcid":"0000-0003-4140-0556 ","last_name":"Brecht","first_name":"Benjamin"},{"first_name":"Christine","last_name":"Silberhorn","id":"26263","full_name":"Silberhorn, Christine"},{"first_name":"Tim","full_name":"Bartley, Tim","id":"49683","last_name":"Bartley"}],"publisher":"SPIE","date_updated":"2025-07-11T09:22:11Z","doi":"10.1117/12.3054905","title":"Optimizing photon-number resolution with superconducting nanowire multi-photon detectors"},{"year":"2025","issue":"8","title":"Jitter in photon-number-resolved detection by superconducting nanowires","date_created":"2025-09-01T11:12:19Z","publisher":"AIP Publishing","abstract":[{"lang":"eng","text":"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)."}],"publication":"APL Photonics","language":[{"iso":"eng"}],"keyword":["Jitter","PNR","SNSPD"],"external_id":{"arxiv":["arXiv:2503.17146"]},"intvolume":" 10","citation":{"ama":"Sidorova M, Schapeler T, Semenov AD, et al. Jitter in photon-number-resolved detection by superconducting nanowires. APL Photonics. 2025;10(8). doi:10.1063/5.0273752","ieee":"M. Sidorova et al., “Jitter in photon-number-resolved detection by superconducting nanowires,” APL Photonics, vol. 10, no. 8, Art. no. 086113, 2025, doi: 10.1063/5.0273752.","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.” APL Photonics 10, no. 8 (2025). https://doi.org/10.1063/5.0273752.","apa":"Sidorova, M., Schapeler, T., Semenov, A. D., Schlue, F., Stefszky, M., Brecht, B., Silberhorn, C., & Bartley, T. (2025). Jitter in photon-number-resolved detection by superconducting nanowires. APL Photonics, 10(8), Article 086113. https://doi.org/10.1063/5.0273752","bibtex":"@article{Sidorova_Schapeler_Semenov_Schlue_Stefszky_Brecht_Silberhorn_Bartley_2025, title={Jitter in photon-number-resolved detection by superconducting nanowires}, volume={10}, DOI={10.1063/5.0273752}, 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} }","short":"M. Sidorova, T. Schapeler, A.D. Semenov, F. Schlue, M. Stefszky, B. Brecht, C. Silberhorn, T. Bartley, APL Photonics 10 (2025).","mla":"Sidorova, Mariia, et al. “Jitter in Photon-Number-Resolved Detection by Superconducting Nanowires.” APL Photonics, vol. 10, no. 8, 086113, AIP Publishing, 2025, doi:10.1063/5.0273752."},"publication_identifier":{"issn":["2378-0967"]},"publication_status":"published","doi":"10.1063/5.0273752","main_file_link":[{"open_access":"1"}],"volume":10,"author":[{"first_name":"Mariia","full_name":"Sidorova, Mariia","last_name":"Sidorova"},{"first_name":"Timon","last_name":"Schapeler","orcid":"0000-0001-7652-1716","id":"55629","full_name":"Schapeler, Timon"},{"full_name":"Semenov, Alexej D.","last_name":"Semenov","first_name":"Alexej D."},{"first_name":"Fabian","last_name":"Schlue","full_name":"Schlue, Fabian","id":"63579"},{"first_name":"Michael","last_name":"Stefszky","full_name":"Stefszky, Michael","id":"42777"},{"orcid":"0000-0003-4140-0556 ","last_name":"Brecht","full_name":"Brecht, Benjamin","id":"27150","first_name":"Benjamin"},{"last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263","first_name":"Christine"},{"first_name":"Tim","last_name":"Bartley","id":"49683","full_name":"Bartley, Tim"}],"oa":"1","date_updated":"2025-09-02T10:47:08Z","status":"public","type":"journal_article","article_type":"original","article_number":"086113","department":[{"_id":"623"},{"_id":"15"}],"user_id":"55629","_id":"61110","project":[{"_id":"191","name":"PhoQuant: Photonische Quantencomputer - Quantencomputing Testplattform"},{"name":"ERC-Grant: QuESADILLA: Quantum Engineering Superconducting Array Detectors in Low-Light Applications","_id":"239"}]},{"volume":429,"author":[{"last_name":"Wulfmeier","full_name":"Wulfmeier, Hendrik","first_name":"Hendrik"},{"first_name":"Uliana","last_name":"Yakhnevych","full_name":"Yakhnevych, Uliana"},{"first_name":"Cornelius","full_name":"Boekhoff, Cornelius","last_name":"Boekhoff"},{"first_name":"Allan","full_name":"Diima, Allan","last_name":"Diima"},{"first_name":"Marlo","full_name":"Kunzner, Marlo","last_name":"Kunzner"},{"first_name":"Leonard M.","full_name":"Verhoff, Leonard M.","last_name":"Verhoff"},{"full_name":"Paul, Jonas","last_name":"Paul","first_name":"Jonas"},{"last_name":"Ratzenberger","full_name":"Ratzenberger, Julius","first_name":"Julius"},{"full_name":"Beyreuther, Elke","last_name":"Beyreuther","first_name":"Elke"},{"last_name":"Gössel","full_name":"Gössel, Joshua","first_name":"Joshua"},{"first_name":"Iuliia","full_name":"Kiseleva, Iuliia","last_name":"Kiseleva"},{"last_name":"Rüsing","orcid":"0000-0003-4682-4577","id":"22501","full_name":"Rüsing, Michael","first_name":"Michael"},{"full_name":"Sanna, Simone","last_name":"Sanna","first_name":"Simone"},{"last_name":"Eng","full_name":"Eng, Lukas M.","first_name":"Lukas M."},{"first_name":"Holger","full_name":"Fritze, Holger","last_name":"Fritze"}],"date_updated":"2025-09-17T16:19:51Z","oa":"1","doi":"10.1016/j.ssi.2025.116949","main_file_link":[{"open_access":"1","url":"https://doi.org/10.1016/j.ssi.2025.116949"}],"publication_identifier":{"issn":["0167-2738"]},"publication_status":"published","intvolume":" 429","citation":{"ama":"Wulfmeier H, Yakhnevych U, Boekhoff C, et al. Demonstration of domain wall current in MgO-doped lithium niobate single crystals up to 400°C. Solid State Ionics. 2025;429. doi:10.1016/j.ssi.2025.116949","chicago":"Wulfmeier, Hendrik, Uliana Yakhnevych, Cornelius Boekhoff, Allan Diima, Marlo Kunzner, Leonard M. Verhoff, Jonas Paul, et al. “Demonstration of Domain Wall Current in MgO-Doped Lithium Niobate Single Crystals up to 400°C.” Solid State Ionics 429 (2025). https://doi.org/10.1016/j.ssi.2025.116949.","ieee":"H. Wulfmeier et al., “Demonstration of domain wall current in MgO-doped lithium niobate single crystals up to 400°C,” Solid State Ionics, vol. 429, Art. no. 116949, 2025, doi: 10.1016/j.ssi.2025.116949.","mla":"Wulfmeier, Hendrik, et al. “Demonstration of Domain Wall Current in MgO-Doped Lithium Niobate Single Crystals up to 400°C.” Solid State Ionics, vol. 429, 116949, Elsevier BV, 2025, doi:10.1016/j.ssi.2025.116949.","bibtex":"@article{Wulfmeier_Yakhnevych_Boekhoff_Diima_Kunzner_Verhoff_Paul_Ratzenberger_Beyreuther_Gössel_et al._2025, title={Demonstration of domain wall current in MgO-doped lithium niobate single crystals up to 400°C}, volume={429}, DOI={10.1016/j.ssi.2025.116949}, number={116949}, journal={Solid State Ionics}, publisher={Elsevier BV}, author={Wulfmeier, Hendrik and Yakhnevych, Uliana and Boekhoff, Cornelius and Diima, Allan and Kunzner, Marlo and Verhoff, Leonard M. and Paul, Jonas and Ratzenberger, Julius and Beyreuther, Elke and Gössel, Joshua and et al.}, year={2025} }","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).","apa":"Wulfmeier, H., Yakhnevych, U., Boekhoff, C., Diima, A., Kunzner, M., Verhoff, L. M., Paul, J., Ratzenberger, J., Beyreuther, E., Gössel, J., Kiseleva, I., Rüsing, M., Sanna, S., Eng, L. M., & Fritze, H. (2025). Demonstration of domain wall current in MgO-doped lithium niobate single crystals up to 400°C. Solid State Ionics, 429, Article 116949. https://doi.org/10.1016/j.ssi.2025.116949"},"department":[{"_id":"15"},{"_id":"288"},{"_id":"623"}],"user_id":"22501","_id":"61338","article_number":"116949","article_type":"original","type":"journal_article","status":"public","date_created":"2025-09-17T16:18:18Z","publisher":"Elsevier BV","title":"Demonstration of domain wall current in MgO-doped lithium niobate single crystals up to 400°C","quality_controlled":"1","year":"2025","language":[{"iso":"eng"}],"publication":"Solid State Ionics","abstract":[{"text":"Conductive ferroelectric domain walls (DWs) represent a promising topical system for the development of nanoelectronic components and device sensors to be operational at elevated temperatures. DWs show very different properties as compared to their hosting bulk crystal, in particular with respect to the high local electrical conductivity. The objective of this work is to demonstrate DW conductivity up to temperatures as high as 400 °C which extends previous studies significantly. Experimental investigation of the DW conductivity of charged, inclined DWs is performed using 5 mol % MgO-doped lithium niobate single crystals. Current–voltage ( ) curves are determined by DC electrometer measurements and impedance spectroscopy and found to be identical. Moreover, impedance spectroscopy enables to recognize artifacts such as damaged electrodes. Temperature dependent measurements over repeated heating cycles reveal two distinct thermal activation energies for a given DW, with the higher of the activation energies only measured at higher temperatures. Depending on the specific sample, the higher activation energy is found above 160 °C to 230 °C. This suggests, in turn, that more than one type of defect/polaron is involved, and that the dominant transport mechanism changes with increasing temperature. First principles atomistic modeling suggests that the conductivity of inclined domain walls cannot be solely explained by the formation of a 2D carrier gas and must be supported by hopping processes. This holds true even at temperatures as high as 400 °C. Our investigations underline the potential to extend DW current based nanoelectronic and sensor applications even into the so-far unexplored temperature range up to 400 °C.","lang":"eng"}]},{"_id":"62639","publication_date":"2025-01-23","department":[{"_id":"58"},{"_id":"623"},{"_id":"288"}],"user_id":"38254","type":"patent","status":"public","ipc":"H03M 1/66","date_updated":"2025-11-27T07:07:16Z","author":[{"first_name":"Stephan","last_name":"Kruse","id":"38254","full_name":"Kruse, Stephan"},{"last_name":"Silberhorn","id":"26263","full_name":"Silberhorn, Christine","first_name":"Christine"},{"first_name":"Benjamin","orcid":"0000-0003-4140-0556 ","last_name":"Brecht","id":"27150","full_name":"Brecht, Benjamin"},{"last_name":"Schwabe","full_name":"Schwabe, Tobias","id":"39217","first_name":"Tobias"}],"date_created":"2025-11-27T07:00:50Z","ipn":"DE102023212604B3","title":"Optisch basierter Digital-Analog-Umsetzer","year":"2025","citation":{"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.","apa":"Kruse, S., Silberhorn, C., Brecht, B., & Schwabe, T. (2025). Optisch basierter Digital-Analog-Umsetzer.","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} }","mla":"Kruse, Stephan, et al. Optisch Basierter Digital-Analog-Umsetzer. 2025.","short":"S. Kruse, C. Silberhorn, B. Brecht, T. Schwabe, (2025)."}},{"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 𝑠𝑝3 peak.","lang":"eng"}],"publication":"Physical Review B","language":[{"iso":"eng"}],"external_id":{"arxiv":["2506.05519"]},"year":"2025","issue":"22","quality_controlled":"1","title":"Phonon dephasing times determined with time-delayed broadband coherent anti-Stokes Raman scattering","date_created":"2025-12-02T19:21:33Z","publisher":"American Physical Society (APS)","status":"public","type":"journal_article","article_type":"original","article_number":"224106","user_id":"22501","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"_id":"62749","citation":{"ama":"Hempel F, Rüsing M, Vernuccio F, et al. Phonon dephasing times determined with time-delayed broadband coherent anti-Stokes Raman scattering. Physical Review B. 2025;112(22). doi:10.1103/1ctr-csjy","ieee":"F. Hempel et al., “Phonon dephasing times determined with time-delayed broadband coherent anti-Stokes Raman scattering,” Physical Review B, vol. 112, no. 22, Art. no. 224106, 2025, doi: 10.1103/1ctr-csjy.","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.","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","short":"F. Hempel, M. Rüsing, F. Vernuccio, K.J. Spychala, R. Buschbeck, G. Cerullo, D. Polli, L.M. Eng, Physical Review B 112 (2025).","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} }","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."},"intvolume":" 112","publication_status":"published","publication_identifier":{"issn":["2469-9950","2469-9969"]},"main_file_link":[{"url":"https://arxiv.org/abs/2506.05519","open_access":"1"}],"doi":"10.1103/1ctr-csjy","author":[{"full_name":"Hempel, F.","last_name":"Hempel","first_name":"F."},{"orcid":"0000-0003-4682-4577","last_name":"Rüsing","id":"22501","full_name":"Rüsing, Michael","first_name":"Michael"},{"first_name":"F.","full_name":"Vernuccio, F.","last_name":"Vernuccio"},{"first_name":"K. J.","last_name":"Spychala","full_name":"Spychala, K. J."},{"full_name":"Buschbeck, R.","last_name":"Buschbeck","first_name":"R."},{"first_name":"G.","last_name":"Cerullo","full_name":"Cerullo, G."},{"last_name":"Polli","full_name":"Polli, D.","first_name":"D."},{"first_name":"L. M.","last_name":"Eng","full_name":"Eng, L. M."}],"volume":112,"date_updated":"2025-12-02T19:23:55Z","oa":"1"},{"citation":{"bibtex":"@article{Kopylov_Stefszky_Meier_Silberhorn_Sharapova_2025, title={Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation}, volume={7}, DOI={10.1103/zp72-7qwl}, number={3033122}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Kopylov, Denis A. and Stefszky, Michael and Meier, Torsten and Silberhorn, Christine and Sharapova, Polina R.}, year={2025} }","mla":"Kopylov, Denis A., et al. “Spectral and Temporal Properties of Type-II Parametric down-Conversion: The Impact of Losses during State Generation.” Physical Review Research, vol. 7, no. 3, 033122, American Physical Society (APS), 2025, doi:10.1103/zp72-7qwl.","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","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","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.","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."},"intvolume":" 7","year":"2025","issue":"3","publication_status":"published","publication_identifier":{"issn":["2643-1564"]},"doi":"10.1103/zp72-7qwl","title":"Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation","author":[{"first_name":"Denis A.","last_name":"Kopylov","full_name":"Kopylov, Denis A."},{"first_name":"Michael","id":"42777","full_name":"Stefszky, Michael","last_name":"Stefszky"},{"first_name":"Torsten","id":"344","full_name":"Meier, Torsten","last_name":"Meier","orcid":"0000-0001-8864-2072"},{"id":"26263","full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine"},{"last_name":"Sharapova","full_name":"Sharapova, Polina R.","id":"60286","first_name":"Polina R."}],"date_created":"2025-12-05T09:33:36Z","volume":7,"date_updated":"2025-12-05T09:55:22Z","publisher":"American Physical Society (APS)","status":"public","abstract":[{"lang":"eng","text":"In this paper, we theoretically study the spectral and temporal properties of pulsed spontaneous parametric down-conversion (SPDC) generated in lossy waveguides. Our theoretical approach is based on the formalism of Gaussian states and the Langevin equation, which is elaborated for weak parametric down-conversion and photon-number-unresolved click detection. Using the example of frequency-degenerate type-II SPDC generated under the pump-idler group-velocity-matching condition, we show how the joint-spectral intensity, mode structure, normalized second-order correlation function, and Hong-Ou-Mandel interference pattern depend on internal losses of the SPDC process. We found that the joint-spectral intensity is almost insensitive to internal losses, while the second-order correlation function shows a strong dependence on them, being different for the signal and idler beams in the presence of internal losses. Based on the sensitivity of the normalized second-order correlation function, we show how its measurement can be used to experimentally determine internal losses."}],"type":"journal_article","publication":"Physical Review Research","language":[{"iso":"eng"}],"article_number":"033122","user_id":"16199","department":[{"_id":"15"},{"_id":"569"},{"_id":"170"},{"_id":"293"},{"_id":"288"},{"_id":"230"},{"_id":"623"},{"_id":"429"},{"_id":"35"}],"project":[{"name":"PhoQC: Photonisches Quantencomputing","_id":"266"},{"_id":"53","name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"},{"_id":"56","name":"TRR 142 - Project Area C"},{"_id":"174","name":"TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen Systemen: Eine theoretische Analyse"}],"_id":"62911"},{"article_type":"original","article_number":"50451","user_id":"49683","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"project":[{"name":"TRR 142; TP C07: Hohlraum-verstärkte Parametrische Fluoreszenz mit zeitlicher Filterung unter Verwendung integrierter supraleitender Detektoren","_id":"171"}],"_id":"62269","status":"public","type":"journal_article","main_file_link":[{"open_access":"1"}],"doi":"10.1364/oe.578108","author":[{"first_name":"Nina Amelie","full_name":"Lange, Nina Amelie","id":"56843","orcid":"0000-0001-6624-7098","last_name":"Lange"},{"first_name":"Sebastian","last_name":"Lengeling","id":"44373","full_name":"Lengeling, Sebastian"},{"first_name":"Philipp","id":"49772","full_name":"Mues, Philipp","orcid":"0000-0003-0643-7636","last_name":"Mues"},{"full_name":"Quiring, Viktor","last_name":"Quiring","first_name":"Viktor"},{"last_name":"Ridder","id":"63574","full_name":"Ridder, Werner","first_name":"Werner"},{"orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner","full_name":"Eigner, Christof","id":"13244","first_name":"Christof"},{"last_name":"Herrmann","full_name":"Herrmann, Harald","id":"216","first_name":"Harald"},{"first_name":"Christine","last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263"},{"first_name":"Tim","last_name":"Bartley","id":"49683","full_name":"Bartley, Tim"}],"volume":33,"date_updated":"2025-12-12T12:13:45Z","oa":"1","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","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} }","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.","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.","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.","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"},"intvolume":" 33","publication_status":"published","publication_identifier":{"issn":["1094-4087"]},"language":[{"iso":"eng"}],"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."}],"publication":"Optics Express","title":"Widely non-degenerate nonlinear frequency conversion in cryogenic titanium in-diffused lithium niobate waveguides","date_created":"2025-11-20T10:35:35Z","publisher":"Optica Publishing Group","year":"2025","issue":"24"},{"citation":{"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} }","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","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.","ieee":"J. Brockmeier et al., “Harnessing temporal dispersion for integrated pump filtering in spontaneous heralded single-photon generation processes,” New Journal of Physics, 2025, doi: 10.1088/1367-2630/ade46c.","ama":"Brockmeier J, Schapeler T, Lange NA, et al. Harnessing temporal dispersion for integrated pump filtering in spontaneous heralded single-photon generation processes. New Journal of Physics. Published online 2025. doi:10.1088/1367-2630/ade46c"},"year":"2025","doi":"10.1088/1367-2630/ade46c","main_file_link":[{"open_access":"1"}],"title":"Harnessing temporal dispersion for integrated pump filtering in spontaneous heralded single-photon generation processes","date_created":"2025-06-30T08:58:37Z","author":[{"first_name":"Julian","full_name":"Brockmeier, Julian","id":"44807","last_name":"Brockmeier"},{"first_name":"Timon","full_name":"Schapeler, Timon","id":"55629","orcid":"0000-0001-7652-1716","last_name":"Schapeler"},{"first_name":"Nina Amelie","full_name":"Lange, Nina Amelie","id":"56843","last_name":"Lange","orcid":"0000-0001-6624-7098"},{"id":"33913","full_name":"Höpker, Jan Philipp","last_name":"Höpker","first_name":"Jan Philipp"},{"full_name":"Herrmann, Harald","id":"216","last_name":"Herrmann","first_name":"Harald"},{"full_name":"Silberhorn, Christine","id":"26263","last_name":"Silberhorn","first_name":"Christine"},{"id":"49683","full_name":"Bartley, Tim","last_name":"Bartley","first_name":"Tim"}],"date_updated":"2025-12-15T09:21:29Z","oa":"1","status":"public","publication":"New Journal of Physics","type":"journal_article","language":[{"iso":"eng"}],"department":[{"_id":"15"},{"_id":"623"}],"user_id":"56843","_id":"60466","project":[{"_id":"171","name":"TRR 142; TP C07: Hohlraum-verstärkte Parametrische Fluoreszenz mit zeitlicher Filterung unter Verwendung integrierter supraleitender Detektoren"}]},{"abstract":[{"lang":"eng","text":"Lithium niobate (LiNbO3) is a widely used material with several desirable physical properties, such as high second-order nonlinear optical and strong electro-optical effects. Thus LiNbO3 is used for various applications such as electro-optic modulation or nonlinear frequency conversion and mixing. But LiNbO3 also exhibits a strong photorefractive effect, which limits the intensity of the optical fields involved. Various approaches to reduce the photorefractive effect have been investigated, such as increasing the temperature, doping the crystal or using different waveguide designs in LiNbO3. Here, we present an analysis of the approach to increase the photorefractive damage threshold by using different waveguide designs. Contrary to previous claims and investigations, our SHG measurements revealed no significant difference in resistance to photorefractive damage when comparing conventional Ti-doped channel waveguides and Ti-doped diced ridge waveguides in LiNbO3. Furthermore, we have investigated the effect of photorefractive cleaning and curing using a light field at 532 nm. Here, we observe a reduction in the photorefractive effect at room temperature during and after SHG measurements, which is an easy alternative to conventional approaches."}],"publication":"Optics & Laser Technology","language":[{"iso":"eng"}],"year":"2025","quality_controlled":"1","title":"Photorefraction and in-situ optical cleaning in various types of LiNbO3 waveguides","date_created":"2025-12-18T08:17:57Z","publisher":"Elsevier BV","status":"public","type":"journal_article","article_number":"114260","article_type":"original","department":[{"_id":"288"},{"_id":"623"},{"_id":"15"}],"user_id":"69553","_id":"63192","intvolume":" 193","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.","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} }","short":"M. Kirsch, C. Kießler, S. Lengeling, M. Stefszky, C. Eigner, H. Herrmann, C. Silberhorn, Optics & Laser Technology 193 (2025)."},"publication_identifier":{"issn":["0030-3992"]},"publication_status":"published","doi":"10.1016/j.optlastec.2025.114260","main_file_link":[{"open_access":"1","url":"https://www.sciencedirect.com/science/article/pii/S0030399225018511?via%3Dihub"}],"volume":193,"author":[{"id":"69553","full_name":"Kirsch, Michelle","last_name":"Kirsch","first_name":"Michelle"},{"last_name":"Kießler","id":"44252","full_name":"Kießler, Christian","first_name":"Christian"},{"id":"44373","full_name":"Lengeling, Sebastian","last_name":"Lengeling","first_name":"Sebastian"},{"last_name":"Stefszky","id":"42777","full_name":"Stefszky, Michael","first_name":"Michael"},{"first_name":"Christof","orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner","id":"13244","full_name":"Eigner, Christof"},{"first_name":"Harald","full_name":"Herrmann, Harald","id":"216","last_name":"Herrmann"},{"id":"26263","full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine"}],"date_updated":"2025-12-18T08:27:13Z","oa":"1"},{"status":"public","abstract":[{"lang":"eng","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."}],"publication":"Physical Review Research","type":"journal_article","language":[{"iso":"eng"}],"article_number":"033152","article_type":"original","department":[{"_id":"15"},{"_id":"623"}],"user_id":"27150","_id":"63213","intvolume":" 7","citation":{"ama":"Serino LM, Chesi G, Brecht B, Maccone L, Macchiavello C, Silberhorn C. Complementarity-based complementarity: The choice of mutually unbiased observables shapes quantum uncertainty relations. Physical Review Research. 2025;7(3). doi: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.","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.","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","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.","short":"L.M. Serino, G. Chesi, B. Brecht, L. Maccone, C. Macchiavello, C. Silberhorn, Physical Review Research 7 (2025)."},"year":"2025","issue":"3","publication_identifier":{"issn":["2643-1564"]},"publication_status":"published","doi":"10.1103/v24q-sl6n","title":"Complementarity-based complementarity: The choice of mutually unbiased observables shapes quantum uncertainty relations","volume":7,"author":[{"last_name":"Serino","id":"88242","full_name":"Serino, Laura Maria","first_name":"Laura Maria"},{"first_name":"Giovanni","last_name":"Chesi","full_name":"Chesi, Giovanni"},{"full_name":"Brecht, Benjamin","id":"27150","orcid":"0000-0003-4140-0556 ","last_name":"Brecht","first_name":"Benjamin"},{"full_name":"Maccone, Lorenzo","last_name":"Maccone","first_name":"Lorenzo"},{"last_name":"Macchiavello","full_name":"Macchiavello, Chiara","first_name":"Chiara"},{"full_name":"Silberhorn, Christine","id":"26263","last_name":"Silberhorn","first_name":"Christine"}],"date_created":"2025-12-18T16:04:45Z","publisher":"American Physical Society (APS)","date_updated":"2025-12-18T16:05:45Z"}]