--- _id: '65094' abstract: - lang: eng text: "\r\n The development of practical sensors for optical coherence tomography (OCT) with undetected photons requires miniaturization via integration. To be practical, these sensors must exhibit a large spectral bandwidth and a high brightness, which are linked to a high axial resolution and a sufficient signal-to-noise ratio, respectively. Here, we combine these requirements in a scheme for OCT measurements with undetected photons based on nonlinear\r\n \ \r\n \ Ti\r\n :\r\n \ \r\n \r\n Li\r\n \ Nb\r\n O\r\n \ \r\n 3\r\n \ \r\n \r\n waveguides. We investigate the performance benchmarks of the commonly used SU(1,1) scheme in comparison to an induced-coherence scheme and find that the latter is actually better suited when implementing measurements with undetected photons in integrated systems. In both schemes, we perform pump-gain optimization and OCT measurements with undetected photons with an axial resolution as low as\r\n \r\n 28\r\n \ \r\n μ\r\n \r\n m\r\n \r\n \r\n \ .\r\n " article_number: '034031' author: - first_name: Franz full_name: Roeder, Franz id: '88149' last_name: Roeder - first_name: René full_name: Pollmann, René id: '78890' last_name: Pollmann - first_name: Viktor full_name: Quiring, Viktor last_name: Quiring - first_name: Christof full_name: Eigner, Christof id: '13244' last_name: Eigner orcid: https://orcid.org/0000-0002-5693-3083 - first_name: Benjamin full_name: Brecht, Benjamin id: '27150' last_name: Brecht orcid: '0000-0003-4140-0556 ' - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn citation: 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 apa: Roeder, F., Pollmann, R., Quiring, V., Eigner, C., Brecht, B., & Silberhorn, C. (2026). Toward integrated sensors for optimized optical coherence tomography with undetected photons. Physical Review Applied, 25(3), Article 034031. https://doi.org/10.1103/cwsx-42c4 bibtex: '@article{Roeder_Pollmann_Quiring_Eigner_Brecht_Silberhorn_2026, title={Toward integrated sensors for optimized optical coherence tomography with undetected photons}, volume={25}, DOI={10.1103/cwsx-42c4}, number={3034031}, journal={Physical Review Applied}, publisher={American Physical Society (APS)}, author={Roeder, Franz and Pollmann, René and Quiring, Viktor and Eigner, Christof and Brecht, Benjamin and Silberhorn, Christine}, year={2026} }' 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. 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.' 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. short: F. Roeder, R. Pollmann, V. Quiring, C. Eigner, B. Brecht, C. Silberhorn, Physical Review Applied 25 (2026). date_created: 2026-03-23T12:28:33Z date_updated: 2026-03-25T07:59:04Z department: - _id: '15' - _id: '623' - _id: '288' doi: 10.1103/cwsx-42c4 intvolume: ' 25' issue: '3' language: - iso: eng publication: Physical Review Applied publication_identifier: issn: - 2331-7019 publication_status: published publisher: American Physical Society (APS) status: public title: Toward integrated sensors for optimized optical coherence tomography with undetected photons type: journal_article user_id: '27150' volume: 25 year: '2026' ... --- _id: '65096' abstract: - lang: eng 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 " article_number: '548' author: - first_name: Patrick Fabian full_name: Folge, Patrick Fabian id: '88605' last_name: Folge - first_name: Laura Maria full_name: Serino, Laura Maria id: '88242' last_name: Serino - first_name: Ladislav full_name: Mišta, Ladislav last_name: Mišta - first_name: Benjamin full_name: Brecht, Benjamin id: '27150' last_name: Brecht orcid: '0000-0003-4140-0556 ' - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Jaroslav full_name: Řeháček, Jaroslav last_name: Řeháček - first_name: Zdeněk full_name: Hradil, Zdeněk last_name: Hradil 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 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 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} }' 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. 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.' 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. short: P.F. Folge, L.M. Serino, L. Mišta, B. Brecht, C. Silberhorn, J. Řeháček, Z. Hradil, Optica 13 (2026). date_created: 2026-03-23T12:30:02Z date_updated: 2026-03-25T07:59:23Z department: - _id: '15' - _id: '623' - _id: '288' doi: 10.1364/optica.579459 intvolume: ' 13' issue: '3' language: - iso: eng publication: Optica publication_identifier: issn: - 2334-2536 publication_status: published publisher: Optica Publishing Group status: public title: Quantum-limited detection of the arrival time and the carrier frequency of time-dependent signals type: journal_article user_id: '27150' volume: 13 year: '2026' ... --- _id: '63451' abstract: - lang: eng text: Superconducting nanowire single-photon detectors (SNSPDs) can enable photon-number resolution (PNR) based on accurate measurements of the detector’s response time to few-photon optical pulses. In this work, we investigate the impact of the optical pulse shape and duration on the accuracy of this method. We find that Gaussian temporal pulse shapes yield cleaner arrival-time histograms and, thus, more accurate PNR, compared to bandpass-filtered pulses of equal bandwidth. For low system jitter and an optical pulse duration comparable to the other jitter contributions, photon numbers can be discriminated in our system with a commercial SNSPD. At 60 ps optical pulse duration, photon-number discrimination is significantly reduced. Furthermore, we highlight the importance of using the correct arrival-time histogram model when analyzing photon-number assignment. Using exponentially modified Gaussian distributions, instead of the commonly used Gaussian distributions, we can more accurately determine photon-number misidentification probabilities. Finally, we reconstruct the positive operator-valued measures of the detector, revealing sharp features that indicate the intrinsic PNR capabilities. article_number: '016102' author: - first_name: Timon full_name: Schapeler, Timon id: '55629' last_name: Schapeler orcid: 0000-0001-7652-1716 - first_name: Isabell full_name: Mischke, Isabell last_name: Mischke - first_name: Fabian full_name: Schlue, Fabian id: '63579' last_name: Schlue - first_name: Michael full_name: Stefszky, Michael id: '42777' last_name: Stefszky - first_name: Benjamin full_name: Brecht, Benjamin id: '27150' last_name: Brecht orcid: '0000-0003-4140-0556 ' - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Tim full_name: Bartley, Tim id: '49683' last_name: Bartley citation: 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 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} }' 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.' 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. short: T. Schapeler, I. Mischke, F. Schlue, M. Stefszky, B. Brecht, C. Silberhorn, T. Bartley, APL Quantum 3 (2026). date_created: 2026-01-05T10:00:58Z date_updated: 2026-03-25T08:00:27Z department: - _id: '15' - _id: '623' - _id: '288' doi: 10.1063/5.0304127 intvolume: ' 3' issue: '1' language: - iso: eng main_file_link: - open_access: '1' oa: '1' project: - _id: '191' name: 'PhoQuant: Photonische Quantencomputer - Quantencomputing Testplattform' - _id: '239' name: 'ERC-Grant: QuESADILLA: Quantum Engineering Superconducting Array Detectors in Low-Light Applications' publication: APL Quantum publication_identifier: issn: - 2835-0103 publication_status: published publisher: AIP Publishing status: public title: Practical considerations for assignment of photon numbers with SNSPDs type: journal_article user_id: '27150' volume: 3 year: '2026' ... --- _id: '65095' abstract: - lang: eng text: "\r\n We provide experimental validation of tight entropic uncertainty relations for the Shannon entropies of observables with mutually unbiased eigenstates in high dimensions. In particular, we address the cases of dimensions\r\n \r\n \ \r\n d\r\n =\r\n \ 3\r\n \r\n \ \r\n , 4, and 5 and consider from 2 to\r\n \r\n \ \r\n d\r\n +\r\n \ 1\r\n \r\n \ \r\n mutually unbiased bases. The experiment is based on pulsed frequency bins measured with a multioutput quantum pulse gate, which can perform projective measurements on a complete high-dimensional basis in the time-frequency domain. Our results fit the theoretical predictions: the bound on the sum of the entropies is never violated and is saturated by the states that minimize the uncertainty relations.\r\n " article_number: '032420' author: - first_name: Laura Maria full_name: Serino, Laura Maria id: '88242' last_name: Serino - first_name: Giovanni full_name: Chesi, Giovanni last_name: Chesi - first_name: Benjamin full_name: Brecht, Benjamin id: '27150' last_name: Brecht orcid: '0000-0003-4140-0556 ' - first_name: Lorenzo full_name: Maccone, Lorenzo last_name: Maccone - first_name: Chiara full_name: Macchiavello, Chiara last_name: Macchiavello - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn citation: ama: Serino LM, Chesi G, Brecht B, Maccone L, Macchiavello C, Silberhorn C. Experimental entropic uncertainty relations in dimensions three to five. Physical Review A. 2026;113(3). doi:10.1103/f6c4-jtlc 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 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} }' 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. 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.' 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. short: L.M. Serino, G. Chesi, B. Brecht, L. Maccone, C. Macchiavello, C. Silberhorn, Physical Review A 113 (2026). date_created: 2026-03-23T12:29:23Z date_updated: 2026-03-25T07:59:36Z department: - _id: '15' - _id: '623' - _id: '288' doi: 10.1103/f6c4-jtlc intvolume: ' 113' issue: '3' language: - iso: eng publication: Physical Review A publication_identifier: issn: - 2469-9926 - 2469-9934 publication_status: published publisher: American Physical Society (APS) status: public title: Experimental entropic uncertainty relations in dimensions three to five type: journal_article user_id: '27150' volume: 113 year: '2026' ... --- _id: '59069' abstract: - lang: eng 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. article_number: '593' article_type: original author: - first_name: Christian full_name: Kießler, Christian id: '44252' last_name: Kießler - first_name: Michelle full_name: Kirsch, Michelle id: '69553' last_name: Kirsch - first_name: Sebastian full_name: Lengeling, Sebastian id: '44373' last_name: Lengeling - first_name: Harald full_name: Herrmann, Harald id: '216' last_name: Herrmann - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn citation: 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 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} }' 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.' 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). date_created: 2025-03-19T10:56:04Z date_updated: 2025-03-19T16:03:25Z department: - _id: '15' - _id: '623' - _id: '288' doi: 10.1364/optcon.557439 intvolume: ' 4' issue: '3' language: - iso: eng publication: Optics Continuum publication_identifier: issn: - 2770-0208 publication_status: published publisher: Optica Publishing Group status: public title: SPDC single-photon source in Ti-indiffused diced ridge LiNbO3 waveguides type: journal_article user_id: '216' volume: 4 year: '2025' ... --- _id: '59276' 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. article_number: '064109' author: - first_name: Mike N. full_name: Pionteck, Mike N. last_name: Pionteck - first_name: Matthias full_name: Roeper, Matthias last_name: Roeper - first_name: Boris full_name: Koppitz, Boris last_name: Koppitz - first_name: Samuel D. full_name: Seddon, Samuel D. last_name: Seddon - first_name: Michael full_name: Rüsing, Michael id: '22501' last_name: Rüsing orcid: 0000-0003-4682-4577 - first_name: Laura full_name: Padberg, Laura id: '40300' last_name: Padberg - first_name: Christof full_name: Eigner, Christof id: '13244' last_name: Eigner orcid: https://orcid.org/0000-0002-5693-3083 - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Simone full_name: Sanna, Simone last_name: Sanna - first_name: Lukas M. full_name: Eng, Lukas M. last_name: Eng 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 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} }' 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. 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.' 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. 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). date_created: 2025-04-02T16:21:47Z date_updated: 2025-04-02T16:24:47Z department: - _id: '15' - _id: '623' - _id: '288' doi: 10.1103/physrevb.111.064109 intvolume: ' 111' issue: '6' language: - iso: eng publication: Physical Review B publication_identifier: issn: - 2469-9950 - 2469-9969 publication_status: published publisher: American Physical Society (APS) quality_controlled: '1' status: public title: Second-order nonlinear piezo-optic properties of single crystal lithium niobate thin films type: journal_article user_id: '22501' volume: 111 year: '2025' ... --- _id: '60136' abstract: - lang: eng 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. article_number: '720' author: - first_name: Frederik full_name: Thiele, Frederik id: '50819' last_name: Thiele orcid: 0000-0003-0663-5587 - first_name: Niklas full_name: Lamberty, Niklas id: '75307' last_name: Lamberty - first_name: Thomas full_name: Hummel, Thomas id: '83846' last_name: Hummel orcid: 0000-0001-8627-2119 - first_name: Nina Amelie full_name: Lange, Nina Amelie id: '56843' last_name: Lange orcid: 0000-0001-6624-7098 - first_name: Lorenzo Manuel full_name: Procopio Peña, Lorenzo Manuel id: '105816' last_name: Procopio Peña - first_name: Aishi full_name: Barua, Aishi id: '104502' last_name: Barua - first_name: Sebastian full_name: Lengeling, Sebastian id: '44373' last_name: Lengeling - first_name: Viktor full_name: Quiring, Viktor last_name: Quiring - first_name: Christof full_name: Eigner, Christof id: '13244' last_name: Eigner orcid: https://orcid.org/0000-0002-5693-3083 - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Tim full_name: Bartley, Tim id: '49683' last_name: Bartley citation: 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 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 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} }' 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.' 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. 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). date_created: 2025-06-04T18:34:16Z date_updated: 2025-06-12T09:56:47Z doi: 10.1364/optica.551287 intvolume: ' 12' issue: '5' language: - iso: eng publication: Optica publication_identifier: issn: - 2334-2536 publication_status: published publisher: Optica Publishing Group status: public title: Cryogenic feedforward of a photonic quantum state type: journal_article user_id: '56843' volume: 12 year: '2025' ... --- _id: '60587' 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 - first_name: Benjamin full_name: Brecht, Benjamin id: '27150' last_name: Brecht orcid: '0000-0003-4140-0556 ' - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Tim full_name: Bartley, Tim id: '49683' last_name: Bartley citation: 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} }' 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. 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.' 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.' date_created: 2025-07-11T09:18:09Z date_updated: 2025-07-11T09:22:11Z department: - _id: '15' - _id: '623' doi: 10.1117/12.3054905 editor: - first_name: Mark A. full_name: Itzler, Mark A. last_name: Itzler - first_name: K. Alex full_name: McIntosh, K. Alex last_name: McIntosh - first_name: Joshua C. full_name: Bienfang, Joshua C. last_name: Bienfang language: - iso: eng project: - _id: '239' call_identifier: ERC grant_number: '101042399' name: 'QuESADILLA: ERC-Grant: QuESADILLA: Quantum Engineering Superconducting Array Detectors in Low-Light Applications' - _id: '191' grant_number: 13N16103 name: 'PhoQuant--QCTest: PhoQuant: Photonische Quantencomputer - Quantencomputing Testplattform' publication: Advanced Photon Counting Techniques XIX publication_status: published publisher: SPIE status: public title: Optimizing photon-number resolution with superconducting nanowire multi-photon detectors type: conference user_id: '55629' year: '2025' ... --- _id: '61110' 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).' article_number: '086113' article_type: original author: - first_name: Mariia full_name: Sidorova, Mariia last_name: Sidorova - first_name: Timon full_name: Schapeler, Timon id: '55629' last_name: Schapeler orcid: 0000-0001-7652-1716 - first_name: Alexej D. full_name: Semenov, Alexej D. last_name: Semenov - first_name: Fabian full_name: Schlue, Fabian id: '63579' last_name: Schlue - first_name: Michael full_name: Stefszky, Michael id: '42777' last_name: Stefszky - first_name: Benjamin full_name: Brecht, Benjamin id: '27150' last_name: Brecht orcid: '0000-0003-4140-0556 ' - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Tim full_name: Bartley, Tim id: '49683' last_name: Bartley 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 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} }' 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. 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.' 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. short: M. Sidorova, T. Schapeler, A.D. Semenov, F. Schlue, M. Stefszky, B. Brecht, C. Silberhorn, T. Bartley, APL Photonics 10 (2025). date_created: 2025-09-01T11:12:19Z date_updated: 2025-09-02T10:47:08Z department: - _id: '623' - _id: '15' doi: 10.1063/5.0273752 external_id: arxiv: - arXiv:2503.17146 intvolume: ' 10' issue: '8' keyword: - Jitter - PNR - SNSPD language: - iso: eng main_file_link: - open_access: '1' oa: '1' project: - _id: '191' name: 'PhoQuant: Photonische Quantencomputer - Quantencomputing Testplattform' - _id: '239' name: 'ERC-Grant: QuESADILLA: Quantum Engineering Superconducting Array Detectors in Low-Light Applications' publication: APL Photonics publication_identifier: issn: - 2378-0967 publication_status: published publisher: AIP Publishing status: public title: Jitter in photon-number-resolved detection by superconducting nanowires type: journal_article user_id: '55629' volume: 10 year: '2025' ... --- _id: '62639' author: - first_name: Stephan full_name: Kruse, Stephan id: '38254' last_name: Kruse - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Benjamin full_name: Brecht, Benjamin id: '27150' last_name: Brecht orcid: '0000-0003-4140-0556 ' - first_name: Tobias full_name: Schwabe, Tobias id: '39217' last_name: Schwabe citation: 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} }' chicago: Kruse, Stephan, Christine Silberhorn, Benjamin Brecht, and Tobias Schwabe. “Optisch Basierter Digital-Analog-Umsetzer,” 2025. ieee: S. Kruse, C. Silberhorn, B. Brecht, and T. Schwabe, “Optisch basierter Digital-Analog-Umsetzer.” 2025. mla: Kruse, Stephan, et al. Optisch Basierter Digital-Analog-Umsetzer. 2025. short: S. Kruse, C. Silberhorn, B. Brecht, T. Schwabe, (2025). date_created: 2025-11-27T07:00:50Z date_updated: 2025-11-27T07:07:16Z department: - _id: '58' - _id: '623' - _id: '288' ipc: H03M 1/66 ipn: DE102023212604B3 publication_date: 2025-01-23 status: public title: Optisch basierter Digital-Analog-Umsetzer type: patent user_id: '38254' year: '2025' ... --- _id: '62911' 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. article_number: '033122' author: - first_name: Denis A. full_name: Kopylov, Denis A. last_name: Kopylov - first_name: Michael full_name: Stefszky, Michael id: '42777' last_name: Stefszky - first_name: Torsten full_name: Meier, Torsten id: '344' last_name: Meier orcid: 0000-0001-8864-2072 - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Polina R. full_name: Sharapova, Polina R. id: '60286' last_name: Sharapova citation: ama: 'Kopylov DA, Stefszky M, Meier T, Silberhorn C, Sharapova PR. Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation. Physical Review Research. 2025;7(3). doi:10.1103/zp72-7qwl' 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' 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} }' chicago: 'Kopylov, Denis A., Michael Stefszky, Torsten Meier, Christine Silberhorn, and Polina R. Sharapova. “Spectral and Temporal Properties of Type-II Parametric down-Conversion: The Impact of Losses during State Generation.” Physical Review Research 7, no. 3 (2025). https://doi.org/10.1103/zp72-7qwl.' ieee: 'D. A. Kopylov, M. Stefszky, T. Meier, C. Silberhorn, and P. R. Sharapova, “Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation,” Physical Review Research, vol. 7, no. 3, Art. no. 033122, 2025, doi: 10.1103/zp72-7qwl.' mla: 'Kopylov, Denis A., et al. “Spectral and Temporal Properties of Type-II Parametric down-Conversion: The Impact of Losses during State Generation.” Physical Review Research, vol. 7, no. 3, 033122, American Physical Society (APS), 2025, doi:10.1103/zp72-7qwl.' short: D.A. Kopylov, M. Stefszky, T. Meier, C. Silberhorn, P.R. Sharapova, Physical Review Research 7 (2025). date_created: 2025-12-05T09:33:36Z date_updated: 2025-12-05T09:55:22Z department: - _id: '15' - _id: '569' - _id: '170' - _id: '293' - _id: '288' - _id: '230' - _id: '623' - _id: '429' - _id: '35' doi: 10.1103/zp72-7qwl intvolume: ' 7' issue: '3' language: - iso: eng project: - _id: '266' name: 'PhoQC: Photonisches Quantencomputing' - _id: '53' name: 'TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen' - _id: '56' name: TRR 142 - Project Area C - _id: '174' name: 'TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen Systemen: Eine theoretische Analyse' publication: Physical Review Research publication_identifier: issn: - 2643-1564 publication_status: published publisher: American Physical Society (APS) status: public title: 'Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation' type: journal_article user_id: '16199' volume: 7 year: '2025' ... --- _id: '62269' 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. article_number: '50451' article_type: original author: - first_name: Nina Amelie full_name: Lange, Nina Amelie id: '56843' last_name: Lange orcid: 0000-0001-6624-7098 - first_name: Sebastian full_name: Lengeling, Sebastian id: '44373' last_name: Lengeling - first_name: Philipp full_name: Mues, Philipp id: '49772' last_name: Mues orcid: 0000-0003-0643-7636 - first_name: Viktor full_name: Quiring, Viktor last_name: Quiring - first_name: Werner full_name: Ridder, Werner id: '63574' last_name: Ridder - first_name: Christof full_name: Eigner, Christof id: '13244' last_name: Eigner orcid: https://orcid.org/0000-0002-5693-3083 - first_name: Harald full_name: Herrmann, Harald id: '216' last_name: Herrmann - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Tim full_name: Bartley, Tim id: '49683' last_name: Bartley citation: 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 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 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} }' 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.' mla: Lange, Nina Amelie, et al. “Widely Non-Degenerate Nonlinear Frequency Conversion in Cryogenic Titanium in-Diffused Lithium Niobate Waveguides.” Optics Express, vol. 33, no. 24, 50451, Optica Publishing Group, 2025, doi:10.1364/oe.578108. short: N.A. Lange, S. Lengeling, P. Mues, V. Quiring, W. Ridder, C. Eigner, H. Herrmann, C. Silberhorn, T. Bartley, Optics Express 33 (2025). date_created: 2025-11-20T10:35:35Z date_updated: 2025-12-12T12:13:45Z department: - _id: '15' - _id: '623' - _id: '288' doi: 10.1364/oe.578108 intvolume: ' 33' issue: '24' language: - iso: eng main_file_link: - open_access: '1' oa: '1' project: - _id: '171' name: 'TRR 142; TP C07: Hohlraum-verstärkte Parametrische Fluoreszenz mit zeitlicher Filterung unter Verwendung integrierter supraleitender Detektoren' publication: Optics Express publication_identifier: issn: - 1094-4087 publication_status: published publisher: Optica Publishing Group status: public title: Widely non-degenerate nonlinear frequency conversion in cryogenic titanium in-diffused lithium niobate waveguides type: journal_article user_id: '49683' volume: 33 year: '2025' ... --- _id: '60466' author: - first_name: Julian full_name: Brockmeier, Julian id: '44807' last_name: Brockmeier - first_name: Timon full_name: Schapeler, Timon id: '55629' last_name: Schapeler orcid: 0000-0001-7652-1716 - first_name: Nina Amelie full_name: Lange, Nina Amelie id: '56843' last_name: Lange orcid: 0000-0001-6624-7098 - first_name: Jan Philipp full_name: Höpker, Jan Philipp id: '33913' last_name: Höpker - first_name: Harald full_name: Herrmann, Harald id: '216' last_name: Herrmann - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Tim full_name: Bartley, Tim id: '49683' last_name: Bartley citation: ama: Brockmeier J, Schapeler T, Lange NA, et al. Harnessing temporal dispersion for integrated pump filtering in spontaneous heralded single-photon generation processes. New Journal of Physics. Published online 2025. doi:10.1088/1367-2630/ade46c 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 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} }' 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.' 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. short: J. Brockmeier, T. Schapeler, N.A. Lange, J.P. Höpker, H. Herrmann, C. Silberhorn, T. Bartley, New Journal of Physics (2025). date_created: 2025-06-30T08:58:37Z date_updated: 2025-12-15T09:21:29Z department: - _id: '15' - _id: '623' doi: 10.1088/1367-2630/ade46c language: - iso: eng main_file_link: - open_access: '1' oa: '1' project: - _id: '171' name: 'TRR 142; TP C07: Hohlraum-verstärkte Parametrische Fluoreszenz mit zeitlicher Filterung unter Verwendung integrierter supraleitender Detektoren' publication: New Journal of Physics status: public title: Harnessing temporal dispersion for integrated pump filtering in spontaneous heralded single-photon generation processes type: journal_article user_id: '56843' year: '2025' ... --- _id: '63192' 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. article_number: '114260' article_type: original author: - first_name: Michelle full_name: Kirsch, Michelle id: '69553' last_name: Kirsch - first_name: Christian full_name: Kießler, Christian id: '44252' last_name: Kießler - first_name: Sebastian full_name: Lengeling, Sebastian id: '44373' last_name: Lengeling - first_name: Michael full_name: Stefszky, Michael id: '42777' last_name: Stefszky - first_name: Christof full_name: Eigner, Christof id: '13244' last_name: Eigner orcid: https://orcid.org/0000-0002-5693-3083 - first_name: Harald full_name: Herrmann, Harald id: '216' last_name: Herrmann - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn 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 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 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} }' 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.' mla: Kirsch, Michelle, et al. “Photorefraction and In-Situ Optical Cleaning in Various Types of LiNbO3 Waveguides.” Optics & Laser Technology, vol. 193, 114260, Elsevier BV, 2025, doi:10.1016/j.optlastec.2025.114260. short: M. Kirsch, C. Kießler, S. Lengeling, M. Stefszky, C. Eigner, H. Herrmann, C. Silberhorn, Optics & Laser Technology 193 (2025). date_created: 2025-12-18T08:17:57Z date_updated: 2025-12-18T08:27:13Z department: - _id: '288' - _id: '623' - _id: '15' doi: 10.1016/j.optlastec.2025.114260 intvolume: ' 193' language: - iso: eng main_file_link: - open_access: '1' url: https://www.sciencedirect.com/science/article/pii/S0030399225018511?via%3Dihub oa: '1' publication: Optics & Laser Technology publication_identifier: issn: - 0030-3992 publication_status: published publisher: Elsevier BV quality_controlled: '1' status: public title: Photorefraction and in-situ optical cleaning in various types of LiNbO3 waveguides type: journal_article user_id: '69553' volume: 193 year: '2025' ... --- _id: '63213' 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.' article_number: '033152' article_type: original author: - first_name: Laura Maria full_name: Serino, Laura Maria id: '88242' last_name: Serino - first_name: Giovanni full_name: Chesi, Giovanni last_name: Chesi - first_name: Benjamin full_name: Brecht, Benjamin id: '27150' last_name: Brecht orcid: '0000-0003-4140-0556 ' - first_name: Lorenzo full_name: Maccone, Lorenzo last_name: Maccone - first_name: Chiara full_name: Macchiavello, Chiara last_name: Macchiavello - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn 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' 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} }' chicago: 'Serino, Laura Maria, Giovanni Chesi, Benjamin Brecht, Lorenzo Maccone, Chiara Macchiavello, and Christine Silberhorn. “Complementarity-Based Complementarity: The Choice of Mutually Unbiased Observables Shapes Quantum Uncertainty Relations.” Physical Review Research 7, no. 3 (2025). https://doi.org/10.1103/v24q-sl6n.' ieee: 'L. M. Serino, G. Chesi, B. Brecht, L. Maccone, C. Macchiavello, and C. Silberhorn, “Complementarity-based complementarity: The choice of mutually unbiased observables shapes quantum uncertainty relations,” Physical Review Research, vol. 7, no. 3, Art. no. 033152, 2025, doi: 10.1103/v24q-sl6n.' 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). date_created: 2025-12-18T16:04:45Z date_updated: 2025-12-18T16:05:45Z department: - _id: '15' - _id: '623' doi: 10.1103/v24q-sl6n intvolume: ' 7' issue: '3' language: - iso: eng publication: Physical Review Research publication_identifier: issn: - 2643-1564 publication_status: published publisher: American Physical Society (APS) status: public title: 'Complementarity-based complementarity: The choice of mutually unbiased observables shapes quantum uncertainty relations' type: journal_article user_id: '27150' volume: 7 year: '2025' ... --- _id: '63215' abstract: - lang: eng text: "Abstract\r\n High-dimensional time-frequency encodings have the potential to significantly advance quantum information science; however, practical applications require precise knowledge of the encoded quantum states, which becomes increasingly challenging for larger Hilbert spaces. Self-guided tomography (SGT) has emerged as a practical and scalable technique for this purpose in the spatial domain. Here, we apply SGT to estimate time-frequency states using a multi-output quantum pulse gate. We achieve fidelities of more than 99% for 3- and 5-dimensional states without the need for calibration or post-processing. We demonstrate the robustness of SGT against statistical and environmental noise, highlighting its efficacy in the photon-starved regime typical of quantum information applications." article_number: '025024' author: - first_name: Laura Maria full_name: Serino, Laura Maria id: '88242' last_name: Serino - first_name: Markus full_name: Rambach, Markus last_name: Rambach - first_name: Benjamin full_name: Brecht, Benjamin id: '27150' last_name: Brecht orcid: '0000-0003-4140-0556 ' - first_name: Jacquiline full_name: Romero, Jacquiline last_name: Romero - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn citation: ama: Serino LM, Rambach M, Brecht B, Romero J, Silberhorn C. Self-guided tomography of time-frequency qudits. Quantum Science and Technology. 2025;10(2). doi:10.1088/2058-9565/adb0ea apa: Serino, L. M., Rambach, M., Brecht, B., Romero, J., & Silberhorn, C. (2025). Self-guided tomography of time-frequency qudits. Quantum Science and Technology, 10(2), Article 025024. https://doi.org/10.1088/2058-9565/adb0ea bibtex: '@article{Serino_Rambach_Brecht_Romero_Silberhorn_2025, title={Self-guided tomography of time-frequency qudits}, volume={10}, DOI={10.1088/2058-9565/adb0ea}, number={2025024}, journal={Quantum Science and Technology}, publisher={IOP Publishing}, author={Serino, Laura Maria and Rambach, Markus and Brecht, Benjamin and Romero, Jacquiline and Silberhorn, Christine}, year={2025} }' chicago: Serino, Laura Maria, Markus Rambach, Benjamin Brecht, Jacquiline Romero, and Christine Silberhorn. “Self-Guided Tomography of Time-Frequency Qudits.” Quantum Science and Technology 10, no. 2 (2025). https://doi.org/10.1088/2058-9565/adb0ea. ieee: 'L. M. Serino, M. Rambach, B. Brecht, J. Romero, and C. Silberhorn, “Self-guided tomography of time-frequency qudits,” Quantum Science and Technology, vol. 10, no. 2, Art. no. 025024, 2025, doi: 10.1088/2058-9565/adb0ea.' mla: Serino, Laura Maria, et al. “Self-Guided Tomography of Time-Frequency Qudits.” Quantum Science and Technology, vol. 10, no. 2, 025024, IOP Publishing, 2025, doi:10.1088/2058-9565/adb0ea. short: L.M. Serino, M. Rambach, B. Brecht, J. Romero, C. Silberhorn, Quantum Science and Technology 10 (2025). date_created: 2025-12-18T16:07:11Z date_updated: 2025-12-18T16:07:35Z department: - _id: '15' - _id: '623' doi: 10.1088/2058-9565/adb0ea intvolume: ' 10' issue: '2' language: - iso: eng publication: Quantum Science and Technology publication_identifier: issn: - 2058-9565 publication_status: published publisher: IOP Publishing status: public title: Self-guided tomography of time-frequency qudits type: journal_article user_id: '27150' volume: 10 year: '2025' ... --- _id: '59895' abstract: - lang: eng text: The generation of optically broadband Nyquist pulse sequences using an integrated Mach-Zehnder modulator (MZM) in a thin-film lithium-niobate (TFLN) platform with repetition rates of 5 to 32 GHz and optical bandwidths of up to 160 GHz is demonstrated. Nyquist pulse sequences with high optical bandwidth can be used as synchronization and control signals in quantum sources based on photon pair generation. author: - first_name: Christian full_name: Kress, Christian id: '13256' last_name: Kress orcid: 0000-0002-4403-2237 - first_name: Martin Miroslavov full_name: Mihaylov, Martin Miroslavov id: '42449' last_name: Mihaylov - first_name: Tobias full_name: Schwabe, Tobias id: '39217' last_name: Schwabe - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: J. Christoph full_name: Scheytt, J. Christoph id: '37144' last_name: Scheytt orcid: '0000-0002-5950-6618 ' citation: ama: 'Kress C, Mihaylov MM, Schwabe T, Silberhorn C, Scheytt JC. Broadband Nyquist Pulse Generation on TFLN Platform for Integrated Quantum Source. In: PIERS Proceedings . PhotonIcs and Electromagnetics Research Symposium (PIERS). doi:https://doi.org/10.1109/PIERS-Spring66516.2025.11276835' apa: Kress, C., Mihaylov, M. M., Schwabe, T., Silberhorn, C., & Scheytt, J. C. (n.d.). Broadband Nyquist Pulse Generation on TFLN Platform for Integrated Quantum Source. PIERS Proceedings . PhotonIcs and Electromagnetics Research Symposium (PIERS), Abu Dhabi. https://doi.org/10.1109/PIERS-Spring66516.2025.11276835 bibtex: '@inproceedings{Kress_Mihaylov_Schwabe_Silberhorn_Scheytt, title={Broadband Nyquist Pulse Generation on TFLN Platform for Integrated Quantum Source}, DOI={https://doi.org/10.1109/PIERS-Spring66516.2025.11276835}, booktitle={PIERS Proceedings }, publisher={PhotonIcs and Electromagnetics Research Symposium (PIERS)}, author={Kress, Christian and Mihaylov, Martin Miroslavov and Schwabe, Tobias and Silberhorn, Christine and Scheytt, J. Christoph} }' chicago: Kress, Christian, Martin Miroslavov Mihaylov, Tobias Schwabe, Christine Silberhorn, and J. Christoph Scheytt. “Broadband Nyquist Pulse Generation on TFLN Platform for Integrated Quantum Source.” In PIERS Proceedings . PhotonIcs and Electromagnetics Research Symposium (PIERS), n.d. https://doi.org/10.1109/PIERS-Spring66516.2025.11276835. ieee: 'C. Kress, M. M. Mihaylov, T. Schwabe, C. Silberhorn, and J. C. Scheytt, “Broadband Nyquist Pulse Generation on TFLN Platform for Integrated Quantum Source,” presented at the PhotonIcs and Electromagnetics Research Symposium (PIERS), Abu Dhabi, doi: https://doi.org/10.1109/PIERS-Spring66516.2025.11276835.' mla: Kress, Christian, et al. “Broadband Nyquist Pulse Generation on TFLN Platform for Integrated Quantum Source.” PIERS Proceedings , PhotonIcs and Electromagnetics Research Symposium (PIERS), doi:https://doi.org/10.1109/PIERS-Spring66516.2025.11276835. short: 'C. Kress, M.M. Mihaylov, T. Schwabe, C. Silberhorn, J.C. Scheytt, in: PIERS Proceedings , PhotonIcs and Electromagnetics Research Symposium (PIERS), n.d.' conference: end_date: 2025-05-09 location: Abu Dhabi name: PhotonIcs and Electromagnetics Research Symposium (PIERS) start_date: 2025-05-03 date_created: 2025-05-14T09:59:50Z date_updated: 2026-01-02T14:29:41Z department: - _id: '58' - _id: '623' doi: https://doi.org/10.1109/PIERS-Spring66516.2025.11276835 language: - iso: eng project: - _id: '302' name: 'PONyDAC: SPP 2111 - PONyDAC II - Präziser Optischer Nyquist-Puls-Synthesizer DAC' - _id: '175' name: 'TRR 142 - C11: TRR 142 - Kompakte Photonenpaar-Quelle mit ultraschnellen Modulatoren auf Basis von CMOS und LNOI (C11*)' publication: 'PIERS Proceedings ' publication_status: accepted publisher: PhotonIcs and Electromagnetics Research Symposium (PIERS) status: public title: Broadband Nyquist Pulse Generation on TFLN Platform for Integrated Quantum Source type: conference user_id: '13256' year: '2025' ... --- _id: '63091' abstract: - lang: eng text: We present the design and characterization of a guided-wave, bright, and highly frequency non-degenerate parametric down-conversion (PDC) source in thin-film lithium niobate. The source generates photon pairs with wavelengths of 815 nm and 1550 nm, linking the visible wavelength regime with telecommunication wavelengths. We confirm the high quality of the generated single photons by determining a value for the heralded second-order correlation function as low as g_h^(2)=(6.7+/-1.1)*10^8-3). Furthermore, we achieve a high spectral brightness of 0.44·10pairs/(smWGHz) which is two orders of magnitude higher than sources based on weakly guiding waveguides. The shape of the PDC spectrum and the strong agreement between the effective and nominal bandwidth highlight our high fabrication quality of periodically poled waveguides. The good agreement between the measured and simulated spectral characteristics of our source demonstrates our excellent understanding of the PDC process. Our result is a valuable step towards practical and scalable quantum communication networks as well as photonic quantum computing. article_number: '52729' article_type: original author: - first_name: Silia full_name: Babel, Silia id: '63231' last_name: Babel orcid: https://orcid.org/0000-0002-1568-2580 - first_name: Laura full_name: Bollmers, Laura id: '61375' last_name: Bollmers - first_name: Franz full_name: Roeder, Franz id: '88149' last_name: Roeder - first_name: Werner full_name: Ridder, Werner id: '63574' last_name: Ridder - first_name: Christian full_name: Golla, Christian id: '40420' last_name: Golla - first_name: Ronja full_name: Köthemann, Ronja last_name: Köthemann - first_name: Bernhard full_name: Reineke, Bernhard id: '29821' last_name: Reineke - first_name: Harald full_name: Herrmann, Harald id: '216' last_name: Herrmann - first_name: Benjamin full_name: Brecht, Benjamin id: '27150' last_name: Brecht orcid: '0000-0003-4140-0556 ' - first_name: Christof full_name: Eigner, Christof id: '13244' last_name: Eigner orcid: https://orcid.org/0000-0002-5693-3083 - first_name: Laura full_name: Padberg, Laura id: '40300' last_name: Padberg - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn citation: ama: Babel S, Bollmers L, Roeder F, et al. Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths. Optics Express. 2025;33(25). doi:10.1364/oe.571605 apa: Babel, S., Bollmers, L., Roeder, F., Ridder, W., Golla, C., Köthemann, R., Reineke, B., Herrmann, H., Brecht, B., Eigner, C., Padberg, L., & Silberhorn, C. (2025). Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths. Optics Express, 33(25), Article 52729. https://doi.org/10.1364/oe.571605 bibtex: '@article{Babel_Bollmers_Roeder_Ridder_Golla_Köthemann_Reineke_Herrmann_Brecht_Eigner_et al._2025, title={Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths}, volume={33}, DOI={10.1364/oe.571605}, number={2552729}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Babel, Silia and Bollmers, Laura and Roeder, Franz and Ridder, Werner and Golla, Christian and Köthemann, Ronja and Reineke, Bernhard and Herrmann, Harald and Brecht, Benjamin and Eigner, Christof and et al.}, year={2025} }' chicago: Babel, Silia, Laura Bollmers, Franz Roeder, Werner Ridder, Christian Golla, Ronja Köthemann, Bernhard Reineke, et al. “Ultrabright, Two-Color Photon Pair Source Based on Thin-Film Lithium Niobate for Bridging Visible and Telecom Wavelengths.” Optics Express 33, no. 25 (2025). https://doi.org/10.1364/oe.571605. ieee: 'S. Babel et al., “Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths,” Optics Express, vol. 33, no. 25, Art. no. 52729, 2025, doi: 10.1364/oe.571605.' mla: Babel, Silia, et al. “Ultrabright, Two-Color Photon Pair Source Based on Thin-Film Lithium Niobate for Bridging Visible and Telecom Wavelengths.” Optics Express, vol. 33, no. 25, 52729, Optica Publishing Group, 2025, doi:10.1364/oe.571605. short: S. Babel, L. Bollmers, F. Roeder, W. Ridder, C. Golla, R. Köthemann, B. Reineke, H. Herrmann, B. Brecht, C. Eigner, L. Padberg, C. Silberhorn, Optics Express 33 (2025). date_created: 2025-12-15T07:20:36Z date_updated: 2026-01-07T11:28:35Z department: - _id: '288' - _id: '623' doi: 10.1364/oe.571605 intvolume: ' 33' issue: '25' language: - iso: eng main_file_link: - open_access: '1' url: https://opg.optica.org/oe/fulltext.cfm?uri=oe-33-25-52729 oa: '1' publication: Optics Express publication_identifier: issn: - 1094-4087 publication_status: published publisher: Optica Publishing Group status: public title: Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths type: journal_article user_id: '63231' volume: 33 year: '2025' ... --- _id: '62713' abstract: - lang: eng text: Periodically poled thin-film lithium niobate (TFLN) crystals are the fundamental building block for highly-efficient quantum light sources and frequency converters. The efficiency of these devices is strongly dependent on the interaction length between the light and the nonlinear material, scaling quadratically with this parameter. Nevertheless, the fabrication of long, continuously poled areas in TFLN remains challenging, the length of continuously poled areas rarely exceeds 10 mm. In this work, we demonstrate a significant progress in this field achieving the periodic poling of continuous poled areas of 70 mm length with a 3 μm poling period and a close to 50 % duty cycle. We compare two poling electrode design approaches to fabricate long, continuous poled areas. The first approach involves the poling of a single, continuous 70 mm long electrode. The second utilize a segmented approach including the poling of more than 20 individual sections forming together a 70 mm long poling area with no stitching errors. While the continuous electrode allows for faster fabrication, the segmented approach allows to individually optimize the poling resulting in less duty cycle variation. A detailed analysis of the periodic poling results reveals that the results of both are consistent with previously reported poling outcomes for shorter devices. Thus, we demonstrate wafer-scale periodic poling exceeding chiplet-size without any loss in the periodic poling quality. Our work presents a key step towards highly-efficient, narrow-bandwidth and low-pump power nonlinear optical devices. article_type: original author: - first_name: Laura full_name: Bollmers, Laura id: '61375' last_name: Bollmers - first_name: Noah full_name: Spiegelberg, Noah last_name: Spiegelberg - first_name: Michael full_name: Rüsing, Michael id: '22501' last_name: Rüsing orcid: 0000-0003-4682-4577 - first_name: Christof full_name: Eigner, Christof id: '13244' last_name: Eigner orcid: https://orcid.org/0000-0002-5693-3083 - first_name: Laura full_name: Padberg, Laura id: '40300' last_name: Padberg - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn citation: ama: Bollmers L, Spiegelberg N, Rüsing M, Eigner C, Padberg L, Silberhorn C. Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate. Nanophotonics. 2025;14:4761. doi:10.1515/nanoph-2025-0461 apa: Bollmers, L., Spiegelberg, N., Rüsing, M., Eigner, C., Padberg, L., & Silberhorn, C. (2025). Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate. Nanophotonics, 14, 4761. https://doi.org/10.1515/nanoph-2025-0461 bibtex: '@article{Bollmers_Spiegelberg_Rüsing_Eigner_Padberg_Silberhorn_2025, title={Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate}, volume={14}, DOI={10.1515/nanoph-2025-0461}, journal={Nanophotonics}, publisher={Walter de Gruyter GmbH}, author={Bollmers, Laura and Spiegelberg, Noah and Rüsing, Michael and Eigner, Christof and Padberg, Laura and Silberhorn, Christine}, year={2025}, pages={4761} }' chicago: 'Bollmers, Laura, Noah Spiegelberg, Michael Rüsing, Christof Eigner, Laura Padberg, and Christine Silberhorn. “Segmented Finger Electrodes to Optimize Ultra-Long Continuous Wafer-Scale Periodic Poling in Thin-Film Lithium Niobate.” Nanophotonics 14 (2025): 4761. https://doi.org/10.1515/nanoph-2025-0461.' ieee: 'L. Bollmers, N. Spiegelberg, M. Rüsing, C. Eigner, L. Padberg, and C. Silberhorn, “Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate,” Nanophotonics, vol. 14, p. 4761, 2025, doi: 10.1515/nanoph-2025-0461.' mla: Bollmers, Laura, et al. “Segmented Finger Electrodes to Optimize Ultra-Long Continuous Wafer-Scale Periodic Poling in Thin-Film Lithium Niobate.” Nanophotonics, vol. 14, Walter de Gruyter GmbH, 2025, p. 4761, doi:10.1515/nanoph-2025-0461. short: L. Bollmers, N. Spiegelberg, M. Rüsing, C. Eigner, L. Padberg, C. Silberhorn, Nanophotonics 14 (2025) 4761. date_created: 2025-12-01T08:45:07Z date_updated: 2026-01-07T12:06:29Z department: - _id: '15' - _id: '288' - _id: '623' doi: 10.1515/nanoph-2025-0461 intvolume: ' 14' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1515/nanoph-2025-0461 oa: '1' page: '4761' publication: Nanophotonics publication_identifier: issn: - 2192-8606 - 2192-8614 publication_status: published publisher: Walter de Gruyter GmbH quality_controlled: '1' status: public title: Segmented finger electrodes to optimize ultra-long continuous wafer-scale periodic poling in thin-film lithium niobate type: journal_article user_id: '22501' volume: 14 year: '2025' ... --- _id: '60566' article_number: '074402' author: - first_name: Adriana full_name: Bocchini, Adriana id: '58349' last_name: Bocchini orcid: 0000-0002-2134-3075 - first_name: Michael full_name: Rüsing, Michael id: '22501' last_name: Rüsing orcid: 0000-0003-4682-4577 - first_name: Laura full_name: Bollmers, Laura id: '61375' last_name: Bollmers - first_name: Sebastian full_name: Lengeling, Sebastian id: '44373' last_name: Lengeling - first_name: Philipp full_name: Mues, Philipp id: '49772' last_name: Mues orcid: 0000-0003-0643-7636 - first_name: Laura full_name: Padberg, Laura id: '40300' last_name: Padberg - first_name: Uwe full_name: Gerstmann, Uwe id: '171' last_name: Gerstmann orcid: 0000-0002-4476-223X - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Christof full_name: Eigner, Christof id: '13244' last_name: Eigner orcid: https://orcid.org/0000-0002-5693-3083 - first_name: Wolf Gero full_name: Schmidt, Wolf Gero id: '468' last_name: Schmidt orcid: 0000-0002-2717-5076 citation: ama: 'Bocchini A, Rüsing M, Bollmers L, et al. Mg dopants in lithium niobate: Defect models and impact on domain inversion. Physical Review Materials. 2025;9(7). doi:10.1103/5wz1-bjyr' apa: 'Bocchini, A., Rüsing, M., Bollmers, L., Lengeling, S., Mues, P., Padberg, L., Gerstmann, U., Silberhorn, C., Eigner, C., & Schmidt, W. G. (2025). Mg dopants in lithium niobate: Defect models and impact on domain inversion. Physical Review Materials, 9(7), Article 074402. https://doi.org/10.1103/5wz1-bjyr' bibtex: '@article{Bocchini_Rüsing_Bollmers_Lengeling_Mues_Padberg_Gerstmann_Silberhorn_Eigner_Schmidt_2025, title={Mg dopants in lithium niobate: Defect models and impact on domain inversion}, volume={9}, DOI={10.1103/5wz1-bjyr}, number={7074402}, journal={Physical Review Materials}, publisher={American Physical Society (APS)}, author={Bocchini, Adriana and Rüsing, Michael and Bollmers, Laura and Lengeling, Sebastian and Mues, Philipp and Padberg, Laura and Gerstmann, Uwe and Silberhorn, Christine and Eigner, Christof and Schmidt, Wolf Gero}, year={2025} }' chicago: 'Bocchini, Adriana, Michael Rüsing, Laura Bollmers, Sebastian Lengeling, Philipp Mues, Laura Padberg, Uwe Gerstmann, Christine Silberhorn, Christof Eigner, and Wolf Gero Schmidt. “Mg Dopants in Lithium Niobate: Defect Models and Impact on Domain Inversion.” Physical Review Materials 9, no. 7 (2025). https://doi.org/10.1103/5wz1-bjyr.' ieee: 'A. Bocchini et al., “Mg dopants in lithium niobate: Defect models and impact on domain inversion,” Physical Review Materials, vol. 9, no. 7, Art. no. 074402, 2025, doi: 10.1103/5wz1-bjyr.' mla: 'Bocchini, Adriana, et al. “Mg Dopants in Lithium Niobate: Defect Models and Impact on Domain Inversion.” Physical Review Materials, vol. 9, no. 7, 074402, American Physical Society (APS), 2025, doi:10.1103/5wz1-bjyr.' short: A. Bocchini, M. Rüsing, L. Bollmers, S. Lengeling, P. Mues, L. Padberg, U. Gerstmann, C. Silberhorn, C. Eigner, W.G. Schmidt, Physical Review Materials 9 (2025). date_created: 2025-07-09T09:13:24Z date_updated: 2026-03-17T17:50:06Z ddc: - '530' department: - _id: '15' - _id: '623' - _id: '295' - _id: '790' - _id: '288' - _id: '230' - _id: '429' - _id: '35' - _id: '170' - _id: '169' - _id: '27' doi: 10.1103/5wz1-bjyr file: - access_level: open_access content_type: application/pdf creator: adrianab date_created: 2025-07-09T09:18:45Z date_updated: 2025-07-10T06:43:34Z file_id: '60567' file_name: Mg_dopants_LN_PRM.pdf file_size: 4175120 relation: main_file file_date_updated: 2025-07-10T06:43:34Z has_accepted_license: '1' intvolume: ' 9' issue: '7' language: - iso: eng main_file_link: - open_access: '1' url: https://link.aps.org/doi/10.1103/5wz1-bjyr oa: '1' project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' - _id: '53' name: 'TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen' - _id: '55' name: 'TRR 142 - B: TRR 142 - Project Area B' - _id: '54' name: 'TRR 142 - A: TRR 142 - Project Area A' - _id: '168' name: 'TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat (B07*)' - _id: '166' name: 'TRR 142 - A11: TRR 142 - Subproject A11' publication: Physical Review Materials publication_identifier: issn: - 2475-9953 publication_status: published publisher: American Physical Society (APS) status: public title: 'Mg dopants in lithium niobate: Defect models and impact on domain inversion' type: journal_article user_id: '22501' volume: 9 year: '2025' ...