[{"citation":{"bibtex":"@article{Verhoff_Pionteck_Rüsing_Fritze_Eng_Sanna_2024, title={Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls}, volume={6}, DOI={10.1103/physrevresearch.6.l042015}, number={4L042015}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Verhoff, Leonard M. and Pionteck, Mike N. and Rüsing, Michael and Fritze, Holger and Eng, Lukas M. and Sanna, Simone}, year={2024} }","ama":"Verhoff LM, Pionteck MN, Rüsing M, Fritze H, Eng LM, Sanna S. Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls. Physical Review Research. 2024;6(4). doi:10.1103/physrevresearch.6.l042015","mla":"Verhoff, Leonard M., et al. “Two-Dimensional Electronic Conductivity in Insulating Ferroelectrics: Peculiar Properties of Domain Walls.” Physical Review Research, vol. 6, no. 4, L042015, American Physical Society (APS), 2024, doi:10.1103/physrevresearch.6.l042015.","chicago":"Verhoff, Leonard M., Mike N. Pionteck, Michael Rüsing, Holger Fritze, Lukas M. Eng, and Simone Sanna. “Two-Dimensional Electronic Conductivity in Insulating Ferroelectrics: Peculiar Properties of Domain Walls.” Physical Review Research 6, no. 4 (2024). https://doi.org/10.1103/physrevresearch.6.l042015.","short":"L.M. Verhoff, M.N. Pionteck, M. Rüsing, H. Fritze, L.M. Eng, S. Sanna, Physical Review Research 6 (2024).","ieee":"L. M. Verhoff, M. N. Pionteck, M. Rüsing, H. Fritze, L. M. Eng, and S. Sanna, “Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls,” Physical Review Research, vol. 6, no. 4, Art. no. L042015, 2024, doi: 10.1103/physrevresearch.6.l042015.","apa":"Verhoff, L. M., Pionteck, M. N., Rüsing, M., Fritze, H., Eng, L. M., & Sanna, S. (2024). Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls. Physical Review Research, 6(4), Article L042015. https://doi.org/10.1103/physrevresearch.6.l042015"},"status":"public","publisher":"American Physical Society (APS)","_id":"59272","user_id":"22501","volume":6,"issue":"4","publication":"Physical Review Research","abstract":[{"lang":"eng","text":"Ferroelectrics such as LiNbO3 (LN) are wide-band-gap insulators that may show a high local electric conductivity at the domain walls (DWs). The latter are interfaces separating regions of noncollinear polarization, which can be manipulated to build integrated nanoelectronic elements. In the present work, we model different DW types in LN from first principles. Our models reveal the DW morphology and shed light on their electronic properties: A strong band bending is predicted for charged DWs, leading to local metallicity. Defect trapping at the DW may further enhance the electric conductivity."}],"date_created":"2025-04-02T16:08:55Z","type":"journal_article","department":[{"_id":"623"},{"_id":"288"},{"_id":"15"}],"year":"2024","title":"Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls","author":[{"full_name":"Verhoff, Leonard M.","first_name":"Leonard M.","last_name":"Verhoff"},{"first_name":"Mike N.","last_name":"Pionteck","full_name":"Pionteck, Mike N."},{"last_name":"Rüsing","orcid":"0000-0003-4682-4577","first_name":"Michael","full_name":"Rüsing, Michael","id":"22501"},{"full_name":"Fritze, Holger","first_name":"Holger","last_name":"Fritze"},{"first_name":"Lukas M.","last_name":"Eng","full_name":"Eng, Lukas M."},{"full_name":"Sanna, Simone","last_name":"Sanna","first_name":"Simone"}],"publication_identifier":{"issn":["2643-1564"]},"date_updated":"2025-04-02T16:10:59Z","publication_status":"published","intvolume":" 6","main_file_link":[{"url":"https://jlupub.ub.uni-giessen.de/server/api/core/bitstreams/fb2b09e6-c0f8-4209-99a1-79fc81d9b1f9/content"}],"article_number":"L042015","language":[{"iso":"eng"}],"doi":"10.1103/physrevresearch.6.l042015"},{"citation":{"apa":"Ratzenberger, J., Kiseleva, I., Koppitz, B., Beyreuther, E., Zahn, M., Gössel, J., Hegarty, P. A., Amber, Z. H., Rüsing, M., & Eng, L. M. (2024). Toward the reproducible fabrication of conductive ferroelectric domain walls into lithium niobate bulk single crystals. Journal of Applied Physics, 136(10), 104302. https://doi.org/10.1063/5.0219300","ieee":"J. Ratzenberger et al., “Toward the reproducible fabrication of conductive ferroelectric domain walls into lithium niobate bulk single crystals,” Journal of Applied Physics, vol. 136, no. 10, p. 104302, 2024, doi: 10.1063/5.0219300.","chicago":"Ratzenberger, Julius, Iuliia Kiseleva, Boris Koppitz, Elke Beyreuther, Manuel Zahn, Joshua Gössel, Peter A. Hegarty, Zeeshan H. Amber, Michael Rüsing, and Lukas M. Eng. “Toward the Reproducible Fabrication of Conductive Ferroelectric Domain Walls into Lithium Niobate Bulk Single Crystals.” Journal of Applied Physics 136, no. 10 (2024): 104302. https://doi.org/10.1063/5.0219300.","short":"J. Ratzenberger, I. Kiseleva, B. Koppitz, E. Beyreuther, M. Zahn, J. Gössel, P.A. Hegarty, Z.H. Amber, M. Rüsing, L.M. Eng, Journal of Applied Physics 136 (2024) 104302.","mla":"Ratzenberger, Julius, et al. “Toward the Reproducible Fabrication of Conductive Ferroelectric Domain Walls into Lithium Niobate Bulk Single Crystals.” Journal of Applied Physics, vol. 136, no. 10, AIP Publishing, 2024, p. 104302, doi:10.1063/5.0219300.","ama":"Ratzenberger J, Kiseleva I, Koppitz B, et al. Toward the reproducible fabrication of conductive ferroelectric domain walls into lithium niobate bulk single crystals. Journal of Applied Physics. 2024;136(10):104302. doi:10.1063/5.0219300","bibtex":"@article{Ratzenberger_Kiseleva_Koppitz_Beyreuther_Zahn_Gössel_Hegarty_Amber_Rüsing_Eng_2024, title={Toward the reproducible fabrication of conductive ferroelectric domain walls into lithium niobate bulk single crystals}, volume={136}, DOI={10.1063/5.0219300}, number={10}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Ratzenberger, Julius and Kiseleva, Iuliia and Koppitz, Boris and Beyreuther, Elke and Zahn, Manuel and Gössel, Joshua and Hegarty, Peter A. and Amber, Zeeshan H. and Rüsing, Michael and Eng, Lukas M.}, year={2024}, pages={104302} }"},"quality_controlled":"1","oa":"1","status":"public","publisher":"AIP Publishing","_id":"59273","page":"104302","volume":136,"user_id":"22501","issue":"10","publication":"Journal of Applied Physics","abstract":[{"lang":"eng","text":"Ferroelectric domain walls (DWs) are promising structures for assembling future nano-electronic circuit elements on a larger scale since reporting domain wall currents of up to 1 mA per single DW. One key requirement hereto is their reproducible manufacturing by gaining preparative control over domain size and domain wall conductivity (DWC). To date, most works on DWC have focused on exploring the fundamental electrical properties of individual DWs within single-shot experiments, with an emphasis on quantifying the origins of DWC. Very few reports exist when it comes to comparing the DWC properties between two separate DWs, and literally nothing exists where issues of reproducibility in DWC devices have been addressed. To fill this gap while facing the challenge of finding guidelines for achieving predictable DWC performance, we report on a procedure that allows us to reproducibly prepare single hexagonal domains of a predefined diameter into uniaxial ferroelectric lithium niobate single crystals of 200 and 300 μm thickness, respectively. We show that the domain diameter can be controlled with an uncertainty of a few percent. As-grown DWs are then subjected to a standard procedure of current-limited high-voltage DWC enhancement, and they repetitively reach a DWC increase of six orders of magnitude. While all resulting DWs show significantly enhanced DWC values, their individual current–voltage (I–V) characteristics exhibit different shapes, which can be explained by variations in their 3D real structure reflecting local heterogeneities by defects, DW pinning, and surface-near DW inclination."}],"date_created":"2025-04-02T16:12:29Z","department":[{"_id":"288"},{"_id":"15"},{"_id":"623"}],"type":"journal_article","publication_identifier":{"issn":["0021-8979","1089-7550"]},"author":[{"full_name":"Ratzenberger, Julius","first_name":"Julius","last_name":"Ratzenberger"},{"full_name":"Kiseleva, Iuliia","last_name":"Kiseleva","first_name":"Iuliia"},{"first_name":"Boris","last_name":"Koppitz","full_name":"Koppitz, Boris"},{"last_name":"Beyreuther","first_name":"Elke","full_name":"Beyreuther, Elke"},{"full_name":"Zahn, Manuel","last_name":"Zahn","first_name":"Manuel"},{"full_name":"Gössel, Joshua","first_name":"Joshua","last_name":"Gössel"},{"last_name":"Hegarty","first_name":"Peter A.","full_name":"Hegarty, Peter A."},{"full_name":"Amber, Zeeshan H.","first_name":"Zeeshan H.","last_name":"Amber"},{"full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","first_name":"Michael","last_name":"Rüsing","id":"22501"},{"last_name":"Eng","first_name":"Lukas M.","full_name":"Eng, Lukas M."}],"year":"2024","title":"Toward the reproducible fabrication of conductive ferroelectric domain walls into lithium niobate bulk single crystals","intvolume":" 136","article_type":"original","date_updated":"2025-04-02T16:14:31Z","publication_status":"published","language":[{"iso":"eng"}],"main_file_link":[{"open_access":"1","url":" https://doi.org/10.1063/5.0219300"}],"doi":"10.1063/5.0219300"},{"status":"public","user_id":"22501","volume":110,"publisher":"American Physical Society (APS)","_id":"59274","citation":{"ieee":"C. S. J. Lee et al., “Impact of ion exchange on vibrational modes in Rb-doped KTiOPO4: A Raman spectroscopy study on the interplay between ion exchange and polarization switching,” Physical Review B, vol. 110, no. 21, Art. no. 214115, 2024, doi: 10.1103/physrevb.110.214115.","apa":"Lee, C. S. J., Canalias, C., Buschbeck, R., Koppitz, B., Hempel, F., Amber, Z., Eng, L. M., & Rüsing, M. (2024). Impact of ion exchange on vibrational modes in Rb-doped KTiOPO4: A Raman spectroscopy study on the interplay between ion exchange and polarization switching. Physical Review B, 110(21), Article 214115. https://doi.org/10.1103/physrevb.110.214115","chicago":"Lee, Cherrie S. J., Carlota Canalias, Robin Buschbeck, Boris Koppitz, Franz Hempel, Zeeshan Amber, Lukas M. Eng, and Michael Rüsing. “Impact of Ion Exchange on Vibrational Modes in Rb-Doped KTiOPO4: A Raman Spectroscopy Study on the Interplay between Ion Exchange and Polarization Switching.” Physical Review B 110, no. 21 (2024). https://doi.org/10.1103/physrevb.110.214115.","short":"C.S.J. Lee, C. Canalias, R. Buschbeck, B. Koppitz, F. Hempel, Z. Amber, L.M. Eng, M. Rüsing, Physical Review B 110 (2024).","mla":"Lee, Cherrie S. J., et al. “Impact of Ion Exchange on Vibrational Modes in Rb-Doped KTiOPO4: A Raman Spectroscopy Study on the Interplay between Ion Exchange and Polarization Switching.” Physical Review B, vol. 110, no. 21, 214115, American Physical Society (APS), 2024, doi:10.1103/physrevb.110.214115.","bibtex":"@article{Lee_Canalias_Buschbeck_Koppitz_Hempel_Amber_Eng_Rüsing_2024, title={Impact of ion exchange on vibrational modes in Rb-doped KTiOPO4: A Raman spectroscopy study on the interplay between ion exchange and polarization switching}, volume={110}, DOI={10.1103/physrevb.110.214115}, number={21214115}, journal={Physical Review B}, publisher={American Physical Society (APS)}, author={Lee, Cherrie S. J. and Canalias, Carlota and Buschbeck, Robin and Koppitz, Boris and Hempel, Franz and Amber, Zeeshan and Eng, Lukas M. and Rüsing, Michael}, year={2024} }","ama":"Lee CSJ, Canalias C, Buschbeck R, et al. Impact of ion exchange on vibrational modes in Rb-doped KTiOPO4: A Raman spectroscopy study on the interplay between ion exchange and polarization switching. Physical Review B. 2024;110(21). doi:10.1103/physrevb.110.214115"},"date_updated":"2025-04-02T16:18:34Z","publication_status":"published","intvolume":" 110","article_type":"original","title":"Impact of ion exchange on vibrational modes in Rb-doped KTiOPO4: A Raman spectroscopy study on the interplay between ion exchange and polarization switching","year":"2024","author":[{"first_name":"Cherrie S. J.","last_name":"Lee","full_name":"Lee, Cherrie S. J."},{"full_name":"Canalias, Carlota","last_name":"Canalias","first_name":"Carlota"},{"first_name":"Robin","last_name":"Buschbeck","full_name":"Buschbeck, Robin"},{"first_name":"Boris","last_name":"Koppitz","full_name":"Koppitz, Boris"},{"last_name":"Hempel","first_name":"Franz","full_name":"Hempel, Franz"},{"last_name":"Amber","first_name":"Zeeshan","full_name":"Amber, Zeeshan"},{"full_name":"Eng, Lukas M.","last_name":"Eng","first_name":"Lukas M."},{"id":"22501","last_name":"Rüsing","orcid":"0000-0003-4682-4577","first_name":"Michael","full_name":"Rüsing, Michael"}],"publication_identifier":{"issn":["2469-9950","2469-9969"]},"doi":"10.1103/physrevb.110.214115","article_number":"214115","language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"Recently, ion exchange (IE) has been used to periodically modify the coercive field (Ec) of the crystal prior to periodic poling, to fabricate fine-pitch domain structures in Rb-doped KTiOPO4 (RKTP). Here, we use micro-Raman spectroscopy to understand the impact of IE on the vibrational modes related to the Rb/K lattice sites, TiO octahedra, and PO4 tetrahedra, which all form the basis of the RKTP crystal structure. We analyze the Raman spectra of three different RKTP samples: (1) a RKTP sample that shows a poled domain grating only, (2) a RKTP sample that has an Ec grating only, and (3) a RKTP sample that has both an Ec and a domain grating of the nominally same spacing. This allows us to determine the impact of IE on the vibrational modes of RKTP. We characterize the changes in the lower Raman peaks related to the alkali-metal ions, as well as observe lattice modifications induced by the incorporation of Rb+ that extend further into the crystal bulk than the expected IE depth. Moreover, the influence of IE on the domain walls is also manifested in their Raman peak shift. We discuss our results in terms of the deformation of the PO4and TiO groups. Our results highlight the intricate impact of IE on the crystal structure and how it facilitates periodic poling, paving the way for further development of the Ec-engineering technique."}],"issue":"21","publication":"Physical Review B","type":"journal_article","department":[{"_id":"288"},{"_id":"15"},{"_id":"623"}],"date_created":"2025-04-02T16:14:44Z"},{"department":[{"_id":"288"},{"_id":"623"},{"_id":"15"}],"type":"journal_article","date_created":"2025-04-02T16:18:56Z","quality_controlled":"1","abstract":[{"lang":"eng","text":"Studying and understanding many‐body interactions, particularly electron‐boson interactions, is essential for a deeper elucidation of fundamental physical phenomena and the development of novel material functionalities. Here, this aspect is explored in the weak itinerant ferromagnet LaCo2P2 by means of momentum‐resolved photoelectron spectroscopy (ARPES) and first‐principles calculations. The detailed ARPES patterns enable to unveil bulk and surface bands, spin splittings due to Rashba and exchange interactions, as well as the evolution of bands with temperature, which altogether creates a solid foundation for theoretical studies. The latter has allowed to establish the impact of electron‐boson interactions on the electronic structure, that are reflected in its strong renormalization driven by electron‐magnon interaction and the emergence of distinctive kinks of surface and bulk electron bands due to significant electron‐phonon coupling. Our results highlight the distinct impact of electron‐boson interactions on the electronic structure, particularly on the itinerant d states. Similar electronic states are observed in the isostructural iron pnictides, where electron‐boson interactions play a crucial role in the emergence of superconductivity. It is believed that further studies of material systems involving both magnetically active d‐ and f‐sublattices will reveal more advanced phenomena in the bulk and at distinct surfaces, driven by a combination of factors including Rashba and Kondo effects, exchange magnetism, and electron‐boson interactions."}],"citation":{"short":"D.Yu. Usachov, K. Ali, G. Poelchen, M. Mende, S. Schulz, M. Peters, K. Bokai, I.Yu. Sklyadneva, V. Stolyarov, E.V. Chulkov, K. Kliemt, S. Paischer, P.A. Buczek, R. Heid, F. Hempel, M. Rüsing, A. Ernst, C. Krellner, S.V. Eremeev, D.V. Vyalikh, Advanced Physics Research (2024).","chicago":"Usachov, D. Yu., K. Ali, G. Poelchen, M. Mende, S. Schulz, M. Peters, K. Bokai, et al. “Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo2P2.” Advanced Physics Research, 2024. https://doi.org/10.1002/apxr.202400137.","ieee":"D. Yu. Usachov et al., “Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo2P2,” Advanced Physics Research, 2024, doi: 10.1002/apxr.202400137.","apa":"Usachov, D. Yu., Ali, K., Poelchen, G., Mende, M., Schulz, S., Peters, M., Bokai, K., Sklyadneva, I. Yu., Stolyarov, V., Chulkov, E. V., Kliemt, K., Paischer, S., Buczek, P. A., Heid, R., Hempel, F., Rüsing, M., Ernst, A., Krellner, C., Eremeev, S. V., & Vyalikh, D. V. (2024). Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo2P2. Advanced Physics Research. https://doi.org/10.1002/apxr.202400137","bibtex":"@article{Usachov_Ali_Poelchen_Mende_Schulz_Peters_Bokai_Sklyadneva_Stolyarov_Chulkov_et al._2024, title={Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo2P2}, DOI={10.1002/apxr.202400137}, journal={Advanced Physics Research}, publisher={Wiley}, author={Usachov, D. Yu. and Ali, K. and Poelchen, G. and Mende, M. and Schulz, S. and Peters, M. and Bokai, K. and Sklyadneva, I. Yu. and Stolyarov, V. and Chulkov, E. V. and et al.}, year={2024} }","ama":"Usachov DYu, Ali K, Poelchen G, et al. Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo2P2. Advanced Physics Research. Published online 2024. doi:10.1002/apxr.202400137","mla":"Usachov, D. Yu., et al. “Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo2P2.” Advanced Physics Research, Wiley, 2024, doi:10.1002/apxr.202400137."},"publication":"Advanced Physics Research","doi":"10.1002/apxr.202400137","user_id":"22501","_id":"59275","publisher":"Wiley","language":[{"iso":"eng"}],"date_updated":"2025-04-02T16:20:41Z","publication_status":"published","author":[{"first_name":"D. Yu.","last_name":"Usachov","full_name":"Usachov, D. Yu."},{"last_name":"Ali","first_name":"K.","full_name":"Ali, K."},{"last_name":"Poelchen","first_name":"G.","full_name":"Poelchen, G."},{"full_name":"Mende, M.","first_name":"M.","last_name":"Mende"},{"last_name":"Schulz","first_name":"S.","full_name":"Schulz, S."},{"first_name":"M.","last_name":"Peters","full_name":"Peters, M."},{"full_name":"Bokai, K.","last_name":"Bokai","first_name":"K."},{"full_name":"Sklyadneva, I. Yu.","first_name":"I. Yu.","last_name":"Sklyadneva"},{"full_name":"Stolyarov, V.","last_name":"Stolyarov","first_name":"V."},{"last_name":"Chulkov","first_name":"E. V.","full_name":"Chulkov, E. V."},{"last_name":"Kliemt","first_name":"K.","full_name":"Kliemt, K."},{"full_name":"Paischer, S.","first_name":"S.","last_name":"Paischer"},{"first_name":"P. A.","last_name":"Buczek","full_name":"Buczek, P. A."},{"last_name":"Heid","first_name":"R.","full_name":"Heid, R."},{"last_name":"Hempel","first_name":"F.","full_name":"Hempel, F."},{"full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing","first_name":"Michael","id":"22501"},{"last_name":"Ernst","first_name":"A.","full_name":"Ernst, A."},{"full_name":"Krellner, C.","last_name":"Krellner","first_name":"C."},{"first_name":"S. V.","last_name":"Eremeev","full_name":"Eremeev, S. V."},{"full_name":"Vyalikh, D. V.","first_name":"D. V.","last_name":"Vyalikh"}],"publication_identifier":{"issn":["2751-1200","2751-1200"]},"status":"public","year":"2024","title":"Unveiling Electron‐Phonon and Electron‐Magnon Interactions in the Weak Itinerant Ferromagnet LaCo2P2"},{"abstract":[{"lang":"eng","text":"Piezoresponse force microscopy (PFM) is one of the most widespread methods for investigating and visualizing ferroelectric domain structures down to the nanometer length scale. PFM makes use of the direct coupling of the piezoelectric response to the crystal lattice, and hence, it is most often applied to spatially map the three-dimensional (3D) near-surface domain distribution of any polar or ferroic sample. Nonetheless, since most samples investigated by PFM are at least semiconducting or fully insulating, the electric ac field emerging from the conductive scanning force microscopy (SFM) tip penetrates the sample and, hence, may also couple to polar features that are deeply buried into the bulk of the sample under investigation. Thus, in the work presented here, we experimentally and theoretically explore the contrast and depth resolution capabilities of PFM, by analyzing the dependence of several key parameters. These key parameters include the depth of the buried feature, i.e., here a domain wall (DW), as well as PFM-relevant technical parameters such as the tip radius, the PFM drive voltage and frequency, and the signal-to-noise ratio. The theoretical predictions are experimentally verified using x-cut periodically poled lithium niobate single crystals that are specially prepared into wedge-shaped samples, in order to allow the buried feature, here the DW, to be “positioned” at any depth into the bulk. This inspection essentially contributes to the fundamental understanding in PFM contrast analysis and to the reconstruction of 3D domain structures down to a 1 μm-penetration depth into the sample."}],"issue":"22","publication":"Journal of Applied Physics","type":"journal_article","keyword":["Ferroelectrics","lithium niobate","piezoresponse force microscopy"],"department":[{"_id":"15"},{"_id":"169"},{"_id":"288"},{"_id":"623"}],"date_created":"2024-07-01T21:00:43Z","date_updated":"2025-04-03T12:35:34Z","publication_status":"published","intvolume":" 135","article_type":"original","title":"Depth resolution in piezoresponse force microscopy","year":"2024","publication_identifier":{"issn":["0021-8979","1089-7550"]},"author":[{"last_name":"Roeper","first_name":"Matthias","full_name":"Roeper, Matthias"},{"full_name":"Seddon, Samuel D.","first_name":"Samuel D.","last_name":"Seddon"},{"full_name":"Amber, Zeeshan H.","last_name":"Amber","first_name":"Zeeshan H."},{"full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing","first_name":"Michael","id":"22501"},{"full_name":"Eng, Lukas M.","last_name":"Eng","first_name":"Lukas M."}],"doi":"10.1063/5.0206784","main_file_link":[{"open_access":"1","url":"https://doi.org/10.1063/5.0206784"}],"language":[{"iso":"eng"}],"quality_controlled":"1","citation":{"apa":"Roeper, M., Seddon, S. D., Amber, Z. H., Rüsing, M., & Eng, L. M. (2024). Depth resolution in piezoresponse force microscopy. Journal of Applied Physics, 135(22). https://doi.org/10.1063/5.0206784","ieee":"M. Roeper, S. D. Seddon, Z. H. Amber, M. Rüsing, and L. M. Eng, “Depth resolution in piezoresponse force microscopy,” Journal of Applied Physics, vol. 135, no. 22, 2024, doi: 10.1063/5.0206784.","short":"M. Roeper, S.D. Seddon, Z.H. Amber, M. Rüsing, L.M. Eng, Journal of Applied Physics 135 (2024).","chicago":"Roeper, Matthias, Samuel D. Seddon, Zeeshan H. Amber, Michael Rüsing, and Lukas M. Eng. “Depth Resolution in Piezoresponse Force Microscopy.” Journal of Applied Physics 135, no. 22 (2024). https://doi.org/10.1063/5.0206784.","mla":"Roeper, Matthias, et al. “Depth Resolution in Piezoresponse Force Microscopy.” Journal of Applied Physics, vol. 135, no. 22, AIP Publishing, 2024, doi:10.1063/5.0206784.","ama":"Roeper M, Seddon SD, Amber ZH, Rüsing M, Eng LM. Depth resolution in piezoresponse force microscopy. Journal of Applied Physics. 2024;135(22). doi:10.1063/5.0206784","bibtex":"@article{Roeper_Seddon_Amber_Rüsing_Eng_2024, title={Depth resolution in piezoresponse force microscopy}, volume={135}, DOI={10.1063/5.0206784}, number={22}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Roeper, Matthias and Seddon, Samuel D. and Amber, Zeeshan H. and Rüsing, Michael and Eng, Lukas M.}, year={2024} }"},"oa":"1","status":"public","user_id":"22501","volume":135,"publisher":"AIP Publishing","_id":"54966"},{"citation":{"chicago":"Schwabe, Tobias, Michael Rüsing, Niels Staal, Max Schwengelbeck, Laura Bollmers, Laura Padberg, Christof Eigner, Christine Silberhorn, and J. Christoph Scheytt. Quantum Photonic Systems in CMOS Compatible Silicon Nitride Technology . Zenodo, 2024. https://doi.org/10.5281/zenodo.15124929.","short":"T. Schwabe, M. Rüsing, N. Staal, M. Schwengelbeck, L. Bollmers, L. Padberg, C. Eigner, C. Silberhorn, J.C. Scheytt, Quantum Photonic Systems in CMOS Compatible Silicon Nitride Technology , Zenodo, 2024.","apa":"Schwabe, T., Rüsing, M., Staal, N., Schwengelbeck, M., Bollmers, L., Padberg, L., Eigner, C., Silberhorn, C., & Scheytt, J. C. (2024). Quantum photonic systems in CMOS compatible silicon nitride technology . Zenodo. https://doi.org/10.5281/zenodo.15124929","ieee":"T. Schwabe et al., Quantum photonic systems in CMOS compatible silicon nitride technology . Zenodo, 2024.","ama":"Schwabe T, Rüsing M, Staal N, et al. Quantum Photonic Systems in CMOS Compatible Silicon Nitride Technology . Zenodo; 2024. doi:10.5281/zenodo.15124929","bibtex":"@book{Schwabe_Rüsing_Staal_Schwengelbeck_Bollmers_Padberg_Eigner_Silberhorn_Scheytt_2024, title={Quantum photonic systems in CMOS compatible silicon nitride technology }, DOI={10.5281/zenodo.15124929}, publisher={Zenodo}, author={Schwabe, Tobias and Rüsing, Michael and Staal, Niels and Schwengelbeck, Max and Bollmers, Laura and Padberg, Laura and Eigner, Christof and Silberhorn, Christine and Scheytt, J. Christoph}, year={2024} }","mla":"Schwabe, Tobias, et al. Quantum Photonic Systems in CMOS Compatible Silicon Nitride Technology . Zenodo, 2024, doi:10.5281/zenodo.15124929."},"date_created":"2025-04-02T11:24:23Z","type":"misc","department":[{"_id":"288"},{"_id":"15"},{"_id":"623"}],"status":"public","year":"2024","title":"Quantum photonic systems in CMOS compatible silicon nitride technology ","author":[{"id":"39217","full_name":"Schwabe, Tobias","first_name":"Tobias","last_name":"Schwabe"},{"id":"22501","full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing","first_name":"Michael"},{"full_name":"Staal, Niels","last_name":"Staal","first_name":"Niels"},{"full_name":"Schwengelbeck, Max","last_name":"Schwengelbeck","first_name":"Max"},{"last_name":"Bollmers","first_name":"Laura","full_name":"Bollmers, Laura","id":"61375"},{"full_name":"Padberg, Laura","first_name":"Laura","last_name":"Padberg","id":"40300"},{"orcid":"https://orcid.org/0000-0002-5693-3083","first_name":"Christof","last_name":"Eigner","full_name":"Eigner, Christof","id":"13244"},{"full_name":"Silberhorn, Christine","first_name":"Christine","last_name":"Silberhorn","id":"26263"},{"last_name":"Scheytt","orcid":"0000-0002-5950-6618 ","first_name":"J. Christoph","full_name":"Scheytt, J. Christoph","id":"37144"}],"date_updated":"2025-04-03T12:34:56Z","_id":"59259","language":[{"iso":"eng"}],"publisher":"Zenodo","user_id":"22501","doi":"10.5281/zenodo.15124929"},{"status":"public","publisher":"IOP Publishing","_id":"57862","volume":26,"user_id":"13244","citation":{"ama":"Roeder F, Gnanavel A, Pollmann R, et al. Ultra-broadband non-degenerate guided-wave bi-photon source in the near and mid-infrared. New Journal of Physics. 2024;26(12). doi:10.1088/1367-2630/ad9f98","bibtex":"@article{Roeder_Gnanavel_Pollmann_Brecht_Stefszky_Padberg_Eigner_Silberhorn_Brecht_2024, title={Ultra-broadband non-degenerate guided-wave bi-photon source in the near and mid-infrared}, volume={26}, DOI={10.1088/1367-2630/ad9f98}, number={12123025}, journal={New Journal of Physics}, publisher={IOP Publishing}, author={Roeder, Franz and Gnanavel, Abira and Pollmann, René and Brecht, Olga and Stefszky, Michael and Padberg, Laura and Eigner, Christof and Silberhorn, Christine and Brecht, Benjamin}, year={2024} }","mla":"Roeder, Franz, et al. “Ultra-Broadband Non-Degenerate Guided-Wave Bi-Photon Source in the near and Mid-Infrared.” New Journal of Physics, vol. 26, no. 12, 123025, IOP Publishing, 2024, doi:10.1088/1367-2630/ad9f98.","chicago":"Roeder, Franz, Abira Gnanavel, René Pollmann, Olga Brecht, Michael Stefszky, Laura Padberg, Christof Eigner, Christine Silberhorn, and Benjamin Brecht. “Ultra-Broadband Non-Degenerate Guided-Wave Bi-Photon Source in the near and Mid-Infrared.” New Journal of Physics 26, no. 12 (2024). https://doi.org/10.1088/1367-2630/ad9f98.","short":"F. Roeder, A. Gnanavel, R. Pollmann, O. Brecht, M. Stefszky, L. Padberg, C. Eigner, C. Silberhorn, B. Brecht, New Journal of Physics 26 (2024).","apa":"Roeder, F., Gnanavel, A., Pollmann, R., Brecht, O., Stefszky, M., Padberg, L., Eigner, C., Silberhorn, C., & Brecht, B. (2024). Ultra-broadband non-degenerate guided-wave bi-photon source in the near and mid-infrared. New Journal of Physics, 26(12), Article 123025. https://doi.org/10.1088/1367-2630/ad9f98","ieee":"F. Roeder et al., “Ultra-broadband non-degenerate guided-wave bi-photon source in the near and mid-infrared,” New Journal of Physics, vol. 26, no. 12, Art. no. 123025, 2024, doi: 10.1088/1367-2630/ad9f98."},"project":[{"name":"MIRAQLS: MIRAQLS: Mid-infrared Quantum Technology for Sensing","_id":"571"},{"_id":"190","name":"E2TPA: Exploiting Entangled Two-Photon Absorption"}],"author":[{"full_name":"Roeder, Franz","last_name":"Roeder","first_name":"Franz","id":"88149"},{"full_name":"Gnanavel, Abira","first_name":"Abira","last_name":"Gnanavel","id":"81424"},{"id":"78890","full_name":"Pollmann, René","first_name":"René","last_name":"Pollmann"},{"first_name":"Olga","last_name":"Brecht","full_name":"Brecht, Olga"},{"full_name":"Stefszky, Michael","last_name":"Stefszky","first_name":"Michael","id":"42777"},{"id":"40300","full_name":"Padberg, Laura","last_name":"Padberg","first_name":"Laura"},{"full_name":"Eigner, Christof","first_name":"Christof","last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083","id":"13244"},{"full_name":"Silberhorn, Christine","first_name":"Christine","last_name":"Silberhorn","id":"26263"},{"id":"27150","full_name":"Brecht, Benjamin","orcid":"0000-0003-4140-0556 ","last_name":"Brecht","first_name":"Benjamin"}],"publication_identifier":{"issn":["1367-2630"]},"title":"Ultra-broadband non-degenerate guided-wave bi-photon source in the near and mid-infrared","year":"2024","article_type":"original","intvolume":" 26","publication_status":"published","date_updated":"2026-09-02T14:54:23Z","language":[{"iso":"eng"}],"article_number":"123025","doi":"10.1088/1367-2630/ad9f98","issue":"12","publication":"New Journal of Physics","abstract":[{"text":"The latest applications in ultrafast quantum metrology require bright, broadband bi-photon sources with one of the photons in the mid-infrared and the other in the visible to near infrared. However, existing sources based on bulk crystals are limited in brightness due to the short interaction length and only allow for limited dispersion engineering. Here, we present an integrated PDC source based on a Ti:LiNbO3 waveguide that generates broadband bi-photons with central wavelengths at 860 nm and 2800 nm. Their spectral bandwidth exceeds 25 THz and is achieved by simultaneous matching of the group velocities (GVs) and cancellation of GV dispersion for the signal and idler field. We provide an intuitive understanding of the process by studying our source’s behavior at different temperatures and pump wavelengths, which agrees well with simulations.","lang":"eng"}],"date_created":"2024-12-27T19:01:14Z","department":[{"_id":"288"},{"_id":"623"},{"_id":"15"}],"type":"journal_article"},{"author":[{"last_name":"Stefszky","first_name":"M.","full_name":"Stefszky, M."},{"full_name":"vom Bruch, F.","first_name":"F.","last_name":"vom Bruch"},{"full_name":"Santandrea, M.","first_name":"M.","last_name":"Santandrea"},{"first_name":"R.","last_name":"Ricken","full_name":"Ricken, R."},{"first_name":"V.","last_name":"Quiring","full_name":"Quiring, V."},{"last_name":"Eigner","first_name":"C.","full_name":"Eigner, C."},{"first_name":"H","last_name":"Herrmann","full_name":"Herrmann, H"},{"full_name":"Silberhorn, C","first_name":"C","last_name":"Silberhorn"}],"publication_identifier":{"issn":["1094-4087"]},"year":"2023","title":"Lithium niobate waveguide squeezer with integrated cavity length stabilisation for network applications","intvolume":" 31","date_updated":"2023-11-02T09:26:42Z","publication_status":"published","language":[{"iso":"eng"}],"article_number":"34903","doi":"10.1364/oe.498423","issue":"21","publication":"Optics Express","abstract":[{"lang":"eng","text":"We report a titanium indiffused waveguide resonator featuring an integrated electro-optic modulator for cavity length stabilisation that produces close to 5 dB of squeezed light at 1550 nm (2.4 dB directly measured). The resonator is locked on resonance for tens of minutes with 70 mW of SH light incident on the cavity, demonstrating that photorefraction can be mitigated. Squeezed light production concurrent with cavity length stabilisation utilising the integrated EOM is demonstrated. The device demonstrates the suitability of this platform for squeezed light generation in network applications, where stabilisation to the reference field is typically necessary."}],"date_created":"2023-10-19T14:22:59Z","department":[{"_id":"288"},{"_id":"623"}],"type":"journal_article","keyword":["Atomic and Molecular Physics","and Optics"],"status":"public","_id":"48349","publisher":"Optica Publishing Group","volume":31,"user_id":"42777","citation":{"chicago":"Stefszky, M., F. vom Bruch, M. Santandrea, R. Ricken, V. Quiring, C. Eigner, H Herrmann, and C Silberhorn. “Lithium Niobate Waveguide Squeezer with Integrated Cavity Length Stabilisation for Network Applications.” Optics Express 31, no. 21 (2023). https://doi.org/10.1364/oe.498423.","short":"M. Stefszky, F. vom Bruch, M. Santandrea, R. Ricken, V. Quiring, C. Eigner, H. Herrmann, C. Silberhorn, Optics Express 31 (2023).","apa":"Stefszky, M., vom Bruch, F., Santandrea, M., Ricken, R., Quiring, V., Eigner, C., Herrmann, H., & Silberhorn, C. (2023). Lithium niobate waveguide squeezer with integrated cavity length stabilisation for network applications. Optics Express, 31(21), Article 34903. https://doi.org/10.1364/oe.498423","ieee":"M. Stefszky et al., “Lithium niobate waveguide squeezer with integrated cavity length stabilisation for network applications,” Optics Express, vol. 31, no. 21, Art. no. 34903, 2023, doi: 10.1364/oe.498423.","ama":"Stefszky M, vom Bruch F, Santandrea M, et al. Lithium niobate waveguide squeezer with integrated cavity length stabilisation for network applications. Optics Express. 2023;31(21). doi:10.1364/oe.498423","bibtex":"@article{Stefszky_vom Bruch_Santandrea_Ricken_Quiring_Eigner_Herrmann_Silberhorn_2023, title={Lithium niobate waveguide squeezer with integrated cavity length stabilisation for network applications}, volume={31}, DOI={10.1364/oe.498423}, number={2134903}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Stefszky, M. and vom Bruch, F. and Santandrea, M. and Ricken, R. and Quiring, V. and Eigner, C. and Herrmann, H and Silberhorn, C}, year={2023} }","mla":"Stefszky, M., et al. “Lithium Niobate Waveguide Squeezer with Integrated Cavity Length Stabilisation for Network Applications.” Optics Express, vol. 31, no. 21, 34903, Optica Publishing Group, 2023, doi:10.1364/oe.498423."}},{"date_updated":"2024-06-24T06:30:23Z","publication_status":"published","intvolume":" 13","title":"Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family","year":"2023","author":[{"full_name":"Neufeld, Sergej","last_name":"Neufeld","first_name":"Sergej"},{"last_name":"Gerstmann","orcid":"0000-0002-4476-223X","first_name":"Uwe","full_name":"Gerstmann, Uwe","id":"171"},{"first_name":"Laura","last_name":"Padberg","full_name":"Padberg, Laura","id":"40300"},{"id":"13244","full_name":"Eigner, Christof","orcid":"https://orcid.org/0000-0002-5693-3083","first_name":"Christof","last_name":"Eigner"},{"last_name":"Berth","first_name":"Gerhard","full_name":"Berth, Gerhard","id":"53"},{"first_name":"Christine","last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263"},{"full_name":"Eng, Lukas M.","last_name":"Eng","first_name":"Lukas M."},{"id":"468","full_name":"Schmidt, Wolf Gero","first_name":"Wolf Gero","last_name":"Schmidt","orcid":"0000-0002-2717-5076"},{"full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing","first_name":"Michael","id":"22501"}],"publication_identifier":{"issn":["2073-4352"]},"doi":"10.3390/cryst13101423","article_number":"1423","language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"The crystal family of potassium titanyl phosphate (KTiOPO4) is a promising material group for applications in quantum and nonlinear optics. The fabrication of low-loss optical waveguides, as well as high-grade periodically poled ferroelectric domain structures, requires a profound understanding of the material properties and crystal structure. In this regard, Raman spectroscopy offers the possibility to study and visualize domain structures, strain, defects, and the local stoichiometry, which are all factors impacting device performance. However, the accurate interpretation of Raman spectra and their changes with respect to extrinsic and intrinsic defects requires a thorough assignment of the Raman modes to their respective crystal features, which to date is only partly conducted based on phenomenological modelling. To address this issue, we calculated the phonon spectra of potassium titanyl phosphate and the related compounds rubidium titanyl phosphate (RbTiOPO4) and potassium titanyl arsenate (KTiOAsO4) based on density functional theory and compared them with experimental data. Overall, this allows us to assign various spectral features to eigenmodes of lattice substructures with improved detail compared to previous assignments. Nevertheless, the analysis also shows that not all features of the spectra can unambigiously be explained yet. A possible explanation might be that defects or long range fields not included in the modeling play a crucial rule for the resulting Raman spectrum. In conclusion, this work provides an improved foundation into the vibrational properties in the KTiOPO4 material family."}],"publication":"Crystals","issue":"10","type":"journal_article","department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"288"},{"_id":"230"},{"_id":"429"}],"date_created":"2024-06-24T06:15:00Z","status":"public","user_id":"16199","volume":13,"_id":"54852","publisher":"MDPI AG","project":[{"name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53","grant_number":"231447078"}],"citation":{"short":"S. Neufeld, U. Gerstmann, L. Padberg, C. Eigner, G. Berth, C. Silberhorn, L.M. Eng, W.G. Schmidt, M. Rüsing, Crystals 13 (2023).","chicago":"Neufeld, Sergej, Uwe Gerstmann, Laura Padberg, Christof Eigner, Gerhard Berth, Christine Silberhorn, Lukas M. Eng, Wolf Gero Schmidt, and Michael Rüsing. “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family.” Crystals 13, no. 10 (2023). https://doi.org/10.3390/cryst13101423.","apa":"Neufeld, S., Gerstmann, U., Padberg, L., Eigner, C., Berth, G., Silberhorn, C., Eng, L. M., Schmidt, W. G., & Rüsing, M. (2023). Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family. Crystals, 13(10), Article 1423. https://doi.org/10.3390/cryst13101423","ieee":"S. Neufeld et al., “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family,” Crystals, vol. 13, no. 10, Art. no. 1423, 2023, doi: 10.3390/cryst13101423.","ama":"Neufeld S, Gerstmann U, Padberg L, et al. Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family. Crystals. 2023;13(10). doi:10.3390/cryst13101423","bibtex":"@article{Neufeld_Gerstmann_Padberg_Eigner_Berth_Silberhorn_Eng_Schmidt_Rüsing_2023, title={Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family}, volume={13}, DOI={10.3390/cryst13101423}, number={101423}, journal={Crystals}, publisher={MDPI AG}, author={Neufeld, Sergej and Gerstmann, Uwe and Padberg, Laura and Eigner, Christof and Berth, Gerhard and Silberhorn, Christine and Eng, Lukas M. and Schmidt, Wolf Gero and Rüsing, Michael}, year={2023} }","mla":"Neufeld, Sergej, et al. “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family.” Crystals, vol. 13, no. 10, 1423, MDPI AG, 2023, doi:10.3390/cryst13101423."}},{"date_updated":"2023-06-06T10:13:05Z","publication_status":"published","intvolume":" 35","year":"2023","title":"A Pulsed Lidar System With Ultimate Quantum Range Accuracy","publication_identifier":{"issn":["1041-1135","1941-0174"]},"author":[{"first_name":"Stephan","last_name":"Kruse","full_name":"Kruse, Stephan","id":"38254"},{"id":"88242","last_name":"Serino","first_name":"Laura","full_name":"Serino, Laura"},{"id":"88605","full_name":"Folge, Patrick Fabian","first_name":"Patrick Fabian","last_name":"Folge"},{"full_name":"Echeverria Oviedo, Dana","first_name":"Dana","last_name":"Echeverria Oviedo"},{"first_name":"Abhinandan","last_name":"Bhattacharjee","full_name":"Bhattacharjee, Abhinandan"},{"id":"42777","last_name":"Stefszky","first_name":"Michael","full_name":"Stefszky, Michael"},{"id":"37144","orcid":"0000-0002-5950-6618 ","first_name":"J. Christoph","last_name":"Scheytt","full_name":"Scheytt, J. Christoph"},{"id":"27150","full_name":"Brecht, Benjamin","first_name":"Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 "},{"first_name":"Christine","last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263"}],"doi":"10.1109/lpt.2023.3277515","language":[{"iso":"eng"}],"publication":"IEEE Photonics Technology Letters","issue":"14","keyword":["Electrical and Electronic Engineering","Atomic and Molecular Physics","and Optics","Electronic","Optical and Magnetic Materials"],"type":"journal_article","department":[{"_id":"15"},{"_id":"58"},{"_id":"623"},{"_id":"230"},{"_id":"288"}],"date_created":"2023-06-06T10:09:05Z","status":"public","user_id":"27150","volume":35,"page":"769-772","_id":"45485","publisher":"Institute of Electrical and Electronics Engineers (IEEE)","citation":{"apa":"Kruse, S., Serino, L., Folge, P. F., Echeverria Oviedo, D., Bhattacharjee, A., Stefszky, M., Scheytt, J. C., Brecht, B., & Silberhorn, C. (2023). A Pulsed Lidar System With Ultimate Quantum Range Accuracy. IEEE Photonics Technology Letters, 35(14), 769–772. https://doi.org/10.1109/lpt.2023.3277515","ieee":"S. Kruse et al., “A Pulsed Lidar System With Ultimate Quantum Range Accuracy,” IEEE Photonics Technology Letters, vol. 35, no. 14, pp. 769–772, 2023, doi: 10.1109/lpt.2023.3277515.","short":"S. Kruse, L. Serino, P.F. Folge, D. Echeverria Oviedo, A. Bhattacharjee, M. Stefszky, J.C. Scheytt, B. Brecht, C. Silberhorn, IEEE Photonics Technology Letters 35 (2023) 769–772.","chicago":"Kruse, Stephan, Laura Serino, Patrick Fabian Folge, Dana Echeverria Oviedo, Abhinandan Bhattacharjee, Michael Stefszky, J. Christoph Scheytt, Benjamin Brecht, and Christine Silberhorn. “A Pulsed Lidar System With Ultimate Quantum Range Accuracy.” IEEE Photonics Technology Letters 35, no. 14 (2023): 769–72. https://doi.org/10.1109/lpt.2023.3277515.","mla":"Kruse, Stephan, et al. “A Pulsed Lidar System With Ultimate Quantum Range Accuracy.” IEEE Photonics Technology Letters, vol. 35, no. 14, Institute of Electrical and Electronics Engineers (IEEE), 2023, pp. 769–72, doi:10.1109/lpt.2023.3277515.","ama":"Kruse S, Serino L, Folge PF, et al. A Pulsed Lidar System With Ultimate Quantum Range Accuracy. IEEE Photonics Technology Letters. 2023;35(14):769-772. doi:10.1109/lpt.2023.3277515","bibtex":"@article{Kruse_Serino_Folge_Echeverria Oviedo_Bhattacharjee_Stefszky_Scheytt_Brecht_Silberhorn_2023, title={A Pulsed Lidar System With Ultimate Quantum Range Accuracy}, volume={35}, DOI={10.1109/lpt.2023.3277515}, number={14}, journal={IEEE Photonics Technology Letters}, publisher={Institute of Electrical and Electronics Engineers (IEEE)}, author={Kruse, Stephan and Serino, Laura and Folge, Patrick Fabian and Echeverria Oviedo, Dana and Bhattacharjee, Abhinandan and Stefszky, Michael and Scheytt, J. Christoph and Brecht, Benjamin and Silberhorn, Christine}, year={2023}, pages={769–772} }"}},{"citation":{"ieee":"S. Babel et al., “Demonstration of Hong-Ou-Mandel interference in an LNOI directional coupler,” Optics Express, vol. 31, no. 14, Art. no. 23140, 2023, doi: 10.1364/oe.484126.","apa":"Babel, S., Bollmers, L., Massaro, M., Luo, K. H., Stefszky, M., Pegoraro, F., Held, P., Herrmann, H., Eigner, C., Brecht, B., Padberg, L., & Silberhorn, C. (2023). Demonstration of Hong-Ou-Mandel interference in an LNOI directional coupler. Optics Express, 31(14), Article 23140. https://doi.org/10.1364/oe.484126","chicago":"Babel, Silia, Laura Bollmers, Marcello Massaro, Kai Hong Luo, Michael Stefszky, Federico Pegoraro, Philip Held, et al. “Demonstration of Hong-Ou-Mandel Interference in an LNOI Directional Coupler.” Optics Express 31, no. 14 (2023). https://doi.org/10.1364/oe.484126.","short":"S. Babel, L. Bollmers, M. Massaro, K.H. Luo, M. Stefszky, F. Pegoraro, P. Held, H. Herrmann, C. Eigner, B. Brecht, L. Padberg, C. Silberhorn, Optics Express 31 (2023).","mla":"Babel, Silia, et al. “Demonstration of Hong-Ou-Mandel Interference in an LNOI Directional Coupler.” Optics Express, vol. 31, no. 14, 23140, Optica Publishing Group, 2023, doi:10.1364/oe.484126.","bibtex":"@article{Babel_Bollmers_Massaro_Luo_Stefszky_Pegoraro_Held_Herrmann_Eigner_Brecht_et al._2023, title={Demonstration of Hong-Ou-Mandel interference in an LNOI directional coupler}, volume={31}, DOI={10.1364/oe.484126}, number={1423140}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Babel, Silia and Bollmers, Laura and Massaro, Marcello and Luo, Kai Hong and Stefszky, Michael and Pegoraro, Federico and Held, Philip and Herrmann, Harald and Eigner, Christof and Brecht, Benjamin and et al.}, year={2023} }","ama":"Babel S, Bollmers L, Massaro M, et al. Demonstration of Hong-Ou-Mandel interference in an LNOI directional coupler. Optics Express. 2023;31(14). doi:10.1364/oe.484126"},"status":"public","user_id":"63231","volume":31,"_id":"45850","publisher":"Optica Publishing Group","abstract":[{"text":"Interference between single photons is key for many quantum optics experiments and applications in quantum technologies, such as quantum communication or computation. It is advantageous to operate the systems at telecommunication wavelengths and to integrate the setups for these applications in order to improve stability, compactness and scalability. A new promising material platform for integrated quantum optics is lithium niobate on insulator (LNOI). Here, we realise Hong-Ou-Mandel (HOM) interference between telecom photons from an engineered parametric down-conversion source in an LNOI directional coupler. The coupler has been designed and fabricated in house and provides close to perfect balanced beam splitting. We obtain a raw HOM visibility of (93.5 ± 0.7) %, limited mainly by the source performance and in good agreement with off-chip measurements. This lays the foundation for more sophisticated quantum experiments in LNOI.","lang":"eng"}],"publication":"Optics Express","issue":"14","type":"journal_article","keyword":["Atomic and Molecular Physics","and Optics"],"department":[{"_id":"15"},{"_id":"230"},{"_id":"623"},{"_id":"288"}],"date_created":"2023-07-03T14:08:36Z","publication_status":"published","date_updated":"2023-07-05T07:58:31Z","intvolume":" 31","year":"2023","title":"Demonstration of Hong-Ou-Mandel interference in an LNOI directional coupler","author":[{"id":"63231","last_name":"Babel","orcid":"https://orcid.org/0000-0002-1568-2580","first_name":"Silia","full_name":"Babel, Silia"},{"first_name":"Laura","last_name":"Bollmers","full_name":"Bollmers, Laura","id":"61375"},{"first_name":"Marcello","orcid":"0000-0002-2539-7652","last_name":"Massaro","full_name":"Massaro, Marcello","id":"59545"},{"last_name":"Luo","first_name":"Kai Hong","orcid":"0000-0003-1008-4976","full_name":"Luo, Kai Hong","id":"36389"},{"id":"42777","last_name":"Stefszky","first_name":"Michael","full_name":"Stefszky, Michael"},{"full_name":"Pegoraro, Federico","first_name":"Federico","last_name":"Pegoraro","id":"88928"},{"last_name":"Held","first_name":"Philip","full_name":"Held, Philip","id":"68236"},{"full_name":"Herrmann, Harald","last_name":"Herrmann","first_name":"Harald","id":"216"},{"full_name":"Eigner, Christof","last_name":"Eigner","first_name":"Christof","orcid":"https://orcid.org/0000-0002-5693-3083","id":"13244"},{"id":"27150","full_name":"Brecht, Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 ","first_name":"Benjamin"},{"id":"40300","first_name":"Laura","last_name":"Padberg","full_name":"Padberg, Laura"},{"id":"26263","first_name":"Christine","last_name":"Silberhorn","full_name":"Silberhorn, Christine"}],"publication_identifier":{"issn":["1094-4087"]},"doi":"10.1364/oe.484126","article_number":"23140","language":[{"iso":"eng"}]},{"author":[{"last_name":"Domeneguetti","first_name":"Renato","full_name":"Domeneguetti, Renato"},{"id":"42777","full_name":"Stefszky, Michael","last_name":"Stefszky","first_name":"Michael"},{"full_name":"Herrmann, Harald","first_name":"Harald","last_name":"Herrmann","id":"216"},{"id":"26263","first_name":"Christine","last_name":"Silberhorn","full_name":"Silberhorn, Christine"},{"full_name":"Andersen, Ulrik L.","last_name":"Andersen","first_name":"Ulrik L."},{"full_name":"Neergaard-Nielsen, Jonas S.","last_name":"Neergaard-Nielsen","first_name":"Jonas S."},{"last_name":"Gehring","first_name":"Tobias","full_name":"Gehring, Tobias"}],"publication_identifier":{"issn":["0146-9592","1539-4794"]},"title":"Fully guided and phase locked Ti:PPLN waveguide squeezing for applications in quantum sensing","year":"2023","intvolume":" 48","article_type":"original","date_updated":"2023-07-25T10:58:05Z","publication_status":"published","language":[{"iso":"eng"}],"article_number":"2999","doi":"10.1364/ol.486654","issue":"11","publication":"Optics Letters","abstract":[{"lang":"eng","text":"This work reports a fully guided setup for single-mode squeezing on integrated titanium-indiffused periodically poled nonlinear resonators. A continuous-wave laser beam is delivered and the squeezed field is collected by single-mode fibers; up to −3.17(9) dB of useful squeezing is available in fibers. To showcase the usefulness of such a fiber-coupled device, we applied the generated squeezed light in a fiber-based phase sensing experiment, showing a quantum enhancement in the signal-to-noise ratio of 0.35 dB. Moreover, our investigation of the effect of photorefraction on the cavity resonance condition suggests that it causes system instabilities at high powers."}],"date_created":"2023-07-25T10:35:24Z","department":[{"_id":"230"},{"_id":"623"},{"_id":"288"}],"type":"journal_article","keyword":["Atomic and Molecular Physics","and Optics"],"status":"public","_id":"46138","publisher":"Optica Publishing Group","volume":48,"user_id":"216","citation":{"mla":"Domeneguetti, Renato, et al. “Fully Guided and Phase Locked Ti:PPLN Waveguide Squeezing for Applications in Quantum Sensing.” Optics Letters, vol. 48, no. 11, 2999, Optica Publishing Group, 2023, doi:10.1364/ol.486654.","bibtex":"@article{Domeneguetti_Stefszky_Herrmann_Silberhorn_Andersen_Neergaard-Nielsen_Gehring_2023, title={Fully guided and phase locked Ti:PPLN waveguide squeezing for applications in quantum sensing}, volume={48}, DOI={10.1364/ol.486654}, number={112999}, journal={Optics Letters}, publisher={Optica Publishing Group}, author={Domeneguetti, Renato and Stefszky, Michael and Herrmann, Harald and Silberhorn, Christine and Andersen, Ulrik L. and Neergaard-Nielsen, Jonas S. and Gehring, Tobias}, year={2023} }","ama":"Domeneguetti R, Stefszky M, Herrmann H, et al. Fully guided and phase locked Ti:PPLN waveguide squeezing for applications in quantum sensing. Optics Letters. 2023;48(11). doi:10.1364/ol.486654","ieee":"R. Domeneguetti et al., “Fully guided and phase locked Ti:PPLN waveguide squeezing for applications in quantum sensing,” Optics Letters, vol. 48, no. 11, Art. no. 2999, 2023, doi: 10.1364/ol.486654.","apa":"Domeneguetti, R., Stefszky, M., Herrmann, H., Silberhorn, C., Andersen, U. L., Neergaard-Nielsen, J. S., & Gehring, T. (2023). Fully guided and phase locked Ti:PPLN waveguide squeezing for applications in quantum sensing. Optics Letters, 48(11), Article 2999. https://doi.org/10.1364/ol.486654","chicago":"Domeneguetti, Renato, Michael Stefszky, Harald Herrmann, Christine Silberhorn, Ulrik L. Andersen, Jonas S. Neergaard-Nielsen, and Tobias Gehring. “Fully Guided and Phase Locked Ti:PPLN Waveguide Squeezing for Applications in Quantum Sensing.” Optics Letters 48, no. 11 (2023). https://doi.org/10.1364/ol.486654.","short":"R. Domeneguetti, M. Stefszky, H. Herrmann, C. Silberhorn, U.L. Andersen, J.S. Neergaard-Nielsen, T. Gehring, Optics Letters 48 (2023)."},"project":[{"_id":"218","name":"UNIQORN: UNIQORN - Affordable Quantum Communication for Everyone - EU Quantum Flagship Project"}],"quality_controlled":"1"},{"date_created":"2025-09-18T12:06:19Z","department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"790"},{"_id":"288"},{"_id":"230"},{"_id":"429"},{"_id":"35"},{"_id":"27"}],"type":"conference","citation":{"short":"C. Eigner, L. Padberg, V. Quiring, A. Bocchini, M. Santandrea, U. Gerstmann, W.G. Schmidt, C. Silberhorn, in: CLEO 2023, Optica Publishing Group, 2023.","chicago":"Eigner, Christof, Laura Padberg, Viktor Quiring, Adriana Bocchini, Matteo Santandrea, Uwe Gerstmann, Wolf Gero Schmidt, and Christine Silberhorn. “Potassium Titanyl Phosphate Material Engineering Boosting Integrated Optical Source Performance.” In CLEO 2023. Optica Publishing Group, 2023. https://doi.org/10.1364/cleo_at.2023.jw2a.57.","ieee":"C. Eigner et al., “Potassium Titanyl Phosphate Material Engineering Boosting Integrated Optical Source Performance,” 2023, doi: 10.1364/cleo_at.2023.jw2a.57.","apa":"Eigner, C., Padberg, L., Quiring, V., Bocchini, A., Santandrea, M., Gerstmann, U., Schmidt, W. G., & Silberhorn, C. (2023). Potassium Titanyl Phosphate Material Engineering Boosting Integrated Optical Source Performance. CLEO 2023. https://doi.org/10.1364/cleo_at.2023.jw2a.57","bibtex":"@inproceedings{Eigner_Padberg_Quiring_Bocchini_Santandrea_Gerstmann_Schmidt_Silberhorn_2023, title={Potassium Titanyl Phosphate Material Engineering Boosting Integrated Optical Source Performance}, DOI={10.1364/cleo_at.2023.jw2a.57}, booktitle={CLEO 2023}, publisher={Optica Publishing Group}, author={Eigner, Christof and Padberg, Laura and Quiring, Viktor and Bocchini, Adriana and Santandrea, Matteo and Gerstmann, Uwe and Schmidt, Wolf Gero and Silberhorn, Christine}, year={2023} }","ama":"Eigner C, Padberg L, Quiring V, et al. Potassium Titanyl Phosphate Material Engineering Boosting Integrated Optical Source Performance. In: CLEO 2023. Optica Publishing Group; 2023. doi:10.1364/cleo_at.2023.jw2a.57","mla":"Eigner, Christof, et al. “Potassium Titanyl Phosphate Material Engineering Boosting Integrated Optical Source Performance.” CLEO 2023, Optica Publishing Group, 2023, doi:10.1364/cleo_at.2023.jw2a.57."},"publication":"CLEO 2023","project":[{"_id":"52","name":"Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"_id":"53","name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"},{"_id":"54","name":"TRR 142 - Project Area A"},{"_id":"55","name":"TRR 142 - Project Area B"},{"name":"TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat (B07*)","_id":"168"},{"name":"TRR 142 - Subproject A11","_id":"166"}],"abstract":[{"text":"We study the interaction of gray tracking and DC ionic conductivity in Potassium Titanyl Phosphate (KTiOPO4, KTP) and present a novel way to reduce conductivity via a potassium nitrate treatment improving the device quality.","lang":"eng"}],"_id":"61362","language":[{"iso":"eng"}],"publisher":"Optica Publishing Group","user_id":"16199","doi":"10.1364/cleo_at.2023.jw2a.57","author":[{"id":"13244","full_name":"Eigner, Christof","orcid":"https://orcid.org/0000-0002-5693-3083","first_name":"Christof","last_name":"Eigner"},{"last_name":"Padberg","first_name":"Laura","full_name":"Padberg, Laura","id":"40300"},{"full_name":"Quiring, Viktor","last_name":"Quiring","first_name":"Viktor"},{"id":"58349","orcid":"0000-0002-2134-3075","first_name":"Adriana","last_name":"Bocchini","full_name":"Bocchini, Adriana"},{"first_name":"Matteo","orcid":"0000-0001-5718-358X","last_name":"Santandrea","full_name":"Santandrea, Matteo","id":"55095"},{"id":"171","first_name":"Uwe","orcid":"0000-0002-4476-223X","last_name":"Gerstmann","full_name":"Gerstmann, Uwe"},{"id":"468","full_name":"Schmidt, Wolf Gero","last_name":"Schmidt","first_name":"Wolf Gero","orcid":"0000-0002-2717-5076"},{"full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine","id":"26263"}],"title":"Potassium Titanyl Phosphate Material Engineering Boosting Integrated Optical Source Performance","status":"public","year":"2023","publication_status":"published","date_updated":"2025-09-18T12:08:56Z"},{"type":"journal_article","keyword":["General Physics and Astronomy","Mathematical Physics","Applied Mathematics","Electronic","Optical and Magnetic Materials","Electrical and Electronic Engineering","General Computer Science"],"department":[{"_id":"288"},{"_id":"623"},{"_id":"15"}],"date_created":"2023-04-20T12:38:23Z","publication":"PRX Quantum","issue":"2","doi":"10.1103/prxquantum.4.020306","article_number":"020306","language":[{"iso":"eng"}],"publication_status":"published","date_updated":"2025-12-18T16:15:18Z","intvolume":" 4","title":"Realization of a Multi-Output Quantum Pulse Gate for Decoding High-Dimensional Temporal Modes of Single-Photon States","year":"2023","publication_identifier":{"issn":["2691-3399"]},"author":[{"id":"88242","full_name":"Serino, Laura","last_name":"Serino","first_name":"Laura"},{"last_name":"Gil López","first_name":"Jano","full_name":"Gil López, Jano","id":"51223"},{"id":"42777","full_name":"Stefszky, Michael","first_name":"Michael","last_name":"Stefszky"},{"full_name":"Ricken, Raimund","last_name":"Ricken","first_name":"Raimund"},{"first_name":"Christof","last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083","full_name":"Eigner, Christof","id":"13244"},{"first_name":"Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 ","full_name":"Brecht, Benjamin","id":"27150"},{"id":"26263","full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine"}],"citation":{"apa":"Serino, L., Gil López, J., Stefszky, M., Ricken, R., Eigner, C., Brecht, B., & Silberhorn, C. (2023). Realization of a Multi-Output Quantum Pulse Gate for Decoding High-Dimensional Temporal Modes of Single-Photon States. PRX Quantum, 4(2), Article 020306. https://doi.org/10.1103/prxquantum.4.020306","ieee":"L. Serino et al., “Realization of a Multi-Output Quantum Pulse Gate for Decoding High-Dimensional Temporal Modes of Single-Photon States,” PRX Quantum, vol. 4, no. 2, Art. no. 020306, 2023, doi: 10.1103/prxquantum.4.020306.","short":"L. Serino, J. Gil López, M. Stefszky, R. Ricken, C. Eigner, B. Brecht, C. Silberhorn, PRX Quantum 4 (2023).","chicago":"Serino, Laura, Jano Gil López, Michael Stefszky, Raimund Ricken, Christof Eigner, Benjamin Brecht, and Christine Silberhorn. “Realization of a Multi-Output Quantum Pulse Gate for Decoding High-Dimensional Temporal Modes of Single-Photon States.” PRX Quantum 4, no. 2 (2023). https://doi.org/10.1103/prxquantum.4.020306.","mla":"Serino, Laura, et al. “Realization of a Multi-Output Quantum Pulse Gate for Decoding High-Dimensional Temporal Modes of Single-Photon States.” PRX Quantum, vol. 4, no. 2, 020306, American Physical Society (APS), 2023, doi:10.1103/prxquantum.4.020306.","ama":"Serino L, Gil López J, Stefszky M, et al. Realization of a Multi-Output Quantum Pulse Gate for Decoding High-Dimensional Temporal Modes of Single-Photon States. PRX Quantum. 2023;4(2). doi:10.1103/prxquantum.4.020306","bibtex":"@article{Serino_Gil López_Stefszky_Ricken_Eigner_Brecht_Silberhorn_2023, title={Realization of a Multi-Output Quantum Pulse Gate for Decoding High-Dimensional Temporal Modes of Single-Photon States}, volume={4}, DOI={10.1103/prxquantum.4.020306}, number={2020306}, journal={PRX Quantum}, publisher={American Physical Society (APS)}, author={Serino, Laura and Gil López, Jano and Stefszky, Michael and Ricken, Raimund and Eigner, Christof and Brecht, Benjamin and Silberhorn, Christine}, year={2023} }"},"user_id":"27150","volume":4,"_id":"44081","publisher":"American Physical Society (APS)","status":"public"},{"user_id":"68236","volume":98,"_id":"42648","publisher":"IOP Publishing","status":"public","oa":"1","citation":{"chicago":"Pegoraro, Federico, Philip Held, Sonja Barkhofen, Benjamin Brecht, and Christine Silberhorn. “Dynamic Conditioning of Two Particle Discrete-Time Quantum Walks.” Physica Scripta 98, no. 3 (2023). https://doi.org/10.1088/1402-4896/acbcaa.","short":"F. Pegoraro, P. Held, S. Barkhofen, B. Brecht, C. Silberhorn, Physica Scripta 98 (2023).","ieee":"F. Pegoraro, P. Held, S. Barkhofen, B. Brecht, and C. Silberhorn, “Dynamic conditioning of two particle discrete-time quantum walks,” Physica Scripta, vol. 98, no. 3, Art. no. 034005, 2023, doi: 10.1088/1402-4896/acbcaa.","apa":"Pegoraro, F., Held, P., Barkhofen, S., Brecht, B., & Silberhorn, C. (2023). Dynamic conditioning of two particle discrete-time quantum walks. Physica Scripta, 98(3), Article 034005. https://doi.org/10.1088/1402-4896/acbcaa","bibtex":"@article{Pegoraro_Held_Barkhofen_Brecht_Silberhorn_2023, title={Dynamic conditioning of two particle discrete-time quantum walks}, volume={98}, DOI={10.1088/1402-4896/acbcaa}, number={3034005}, journal={Physica Scripta}, publisher={IOP Publishing}, author={Pegoraro, Federico and Held, Philip and Barkhofen, Sonja and Brecht, Benjamin and Silberhorn, Christine}, year={2023} }","ama":"Pegoraro F, Held P, Barkhofen S, Brecht B, Silberhorn C. Dynamic conditioning of two particle discrete-time quantum walks. Physica Scripta. 2023;98(3). doi:10.1088/1402-4896/acbcaa","mla":"Pegoraro, Federico, et al. “Dynamic Conditioning of Two Particle Discrete-Time Quantum Walks.” Physica Scripta, vol. 98, no. 3, 034005, IOP Publishing, 2023, doi:10.1088/1402-4896/acbcaa."},"doi":"10.1088/1402-4896/acbcaa","article_number":"034005","main_file_link":[{"url":"https://iopscience.iop.org/article/10.1088/1402-4896/acbcaa","open_access":"1"}],"language":[{"iso":"eng"}],"publication_status":"published","date_updated":"2026-01-09T09:49:31Z","article_type":"original","intvolume":" 98","year":"2023","title":"Dynamic conditioning of two particle discrete-time quantum walks","publication_identifier":{"issn":["0031-8949","1402-4896"]},"author":[{"id":"88928","full_name":"Pegoraro, Federico","last_name":"Pegoraro","first_name":"Federico"},{"first_name":"Philip","last_name":"Held","full_name":"Held, Philip","id":"68236"},{"last_name":"Barkhofen","first_name":"Sonja","full_name":"Barkhofen, Sonja","id":"48188"},{"full_name":"Brecht, Benjamin","orcid":"0000-0003-4140-0556 ","first_name":"Benjamin","last_name":"Brecht","id":"27150"},{"last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263"}],"type":"journal_article","department":[{"_id":"623"},{"_id":"15"},{"_id":"288"},{"_id":"169"}],"date_created":"2023-03-02T09:53:59Z","abstract":[{"text":"In real photonic quantum systems losses are an unavoidable factor limiting the scalability to many modes and particles, restraining their application in fields as quantum information and communication. For this reason, a considerable amount of engineering effort has been taken in order to improve the quality of particle sources and system components. At the same time, data analysis and collection methods based on post-selection have been used to mitigate the effect of particle losses. This has allowed for investigating experimentally multi-particle evolutions where the observer lacks knowledge about the system's intermediate propagation states. Nonetheless, the fundamental question how losses affect the behaviour of the surviving subset of a multi-particle system has not been investigated so far. For this reason, here we study the impact of particle losses in a quantum walk of two photons reconstructing the output probability distributions for one photon conditioned on the loss of the other in a known mode and temporal step of our evolution network. We present the underlying theoretical scheme that we have devised in order to model controlled particle losses, we describe an experimental platform capable of implementing our theory in a time multiplexing encoding. In the end we show how localized particle losses change the output distributions without altering their asymptotic spreading properties. Finally we devise a quantum civilization problem, a two walker generalisation of single particle recurrence processes.","lang":"eng"}],"issue":"3","publication":"Physica Scripta"},{"status":"public","user_id":"48188","volume":129,"publisher":"American Physical Society (APS)","_id":"40273","citation":{"ama":"Meyer-Scott E, Prasannan N, Dhand I, et al. Scalable Generation of Multiphoton Entangled States by Active Feed-Forward and Multiplexing. Physical Review Letters. 2022;129(15). doi:10.1103/physrevlett.129.150501","bibtex":"@article{Meyer-Scott_Prasannan_Dhand_Eigner_Quiring_Barkhofen_Brecht_Plenio_Silberhorn_2022, title={Scalable Generation of Multiphoton Entangled States by Active Feed-Forward and Multiplexing}, volume={129}, DOI={10.1103/physrevlett.129.150501}, number={15150501}, journal={Physical Review Letters}, publisher={American Physical Society (APS)}, author={Meyer-Scott, Evan and Prasannan, Nidhin and Dhand, Ish and Eigner, Christof and Quiring, Viktor and Barkhofen, Sonja and Brecht, Benjamin and Plenio, Martin B. and Silberhorn, Christine}, year={2022} }","mla":"Meyer-Scott, Evan, et al. “Scalable Generation of Multiphoton Entangled States by Active Feed-Forward and Multiplexing.” Physical Review Letters, vol. 129, no. 15, 150501, American Physical Society (APS), 2022, doi:10.1103/physrevlett.129.150501.","chicago":"Meyer-Scott, Evan, Nidhin Prasannan, Ish Dhand, Christof Eigner, Viktor Quiring, Sonja Barkhofen, Benjamin Brecht, Martin B. Plenio, and Christine Silberhorn. “Scalable Generation of Multiphoton Entangled States by Active Feed-Forward and Multiplexing.” Physical Review Letters 129, no. 15 (2022). https://doi.org/10.1103/physrevlett.129.150501.","short":"E. Meyer-Scott, N. Prasannan, I. Dhand, C. Eigner, V. Quiring, S. Barkhofen, B. Brecht, M.B. Plenio, C. Silberhorn, Physical Review Letters 129 (2022).","apa":"Meyer-Scott, E., Prasannan, N., Dhand, I., Eigner, C., Quiring, V., Barkhofen, S., Brecht, B., Plenio, M. B., & Silberhorn, C. (2022). Scalable Generation of Multiphoton Entangled States by Active Feed-Forward and Multiplexing. Physical Review Letters, 129(15), Article 150501. https://doi.org/10.1103/physrevlett.129.150501","ieee":"E. Meyer-Scott et al., “Scalable Generation of Multiphoton Entangled States by Active Feed-Forward and Multiplexing,” Physical Review Letters, vol. 129, no. 15, Art. no. 150501, 2022, doi: 10.1103/physrevlett.129.150501."},"date_updated":"2023-02-02T08:53:55Z","publication_status":"published","intvolume":" 129","title":"Scalable Generation of Multiphoton Entangled States by Active Feed-Forward and Multiplexing","year":"2022","author":[{"first_name":"Evan","last_name":"Meyer-Scott","full_name":"Meyer-Scott, Evan"},{"first_name":"Nidhin","last_name":"Prasannan","full_name":"Prasannan, Nidhin","id":"71403"},{"full_name":"Dhand, Ish","first_name":"Ish","last_name":"Dhand"},{"id":"13244","full_name":"Eigner, Christof","last_name":"Eigner","first_name":"Christof","orcid":"https://orcid.org/0000-0002-5693-3083"},{"full_name":"Quiring, Viktor","last_name":"Quiring","first_name":"Viktor"},{"full_name":"Barkhofen, Sonja","first_name":"Sonja","last_name":"Barkhofen","id":"48188"},{"last_name":"Brecht","first_name":"Benjamin","orcid":"0000-0003-4140-0556 ","full_name":"Brecht, Benjamin","id":"27150"},{"first_name":"Martin B.","last_name":"Plenio","full_name":"Plenio, Martin B."},{"full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine","id":"26263"}],"publication_identifier":{"issn":["0031-9007","1079-7114"]},"doi":"10.1103/physrevlett.129.150501","article_number":"150501","language":[{"iso":"eng"}],"publication":"Physical Review Letters","issue":"15","keyword":["General Physics and Astronomy"],"type":"journal_article","department":[{"_id":"288"},{"_id":"15"},{"_id":"623"},{"_id":"230"}],"date_created":"2023-01-26T10:21:24Z"},{"department":[{"_id":"293"},{"_id":"35"},{"_id":"15"},{"_id":"170"},{"_id":"230"},{"_id":"35"},{"_id":"482"},{"_id":"706"},{"_id":"288"}],"type":"conference","date_created":"2023-04-16T01:31:32Z","abstract":[{"text":"We demonstrate theoretically and experimentally complex correlations in the photon numbers of two-mode quantum states using measurement-induced nonlinearity. For this, we combine the interference of coherent states and single photons with photon sub-traction.","lang":"eng"}],"publication":"Conference on Lasers and Electro-Optics: Applications and Technology","doi":"10.1364/CLEO_AT.2022.JTu3A.17","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://opg.optica.org/abstract.cfm?uri=CLEO_AT-2022-JTu3A.17"}],"publication_status":"published","date_updated":"2023-04-21T11:10:06Z","publication_identifier":{"isbn":["978-1-957171-05-0"]},"author":[{"full_name":"Meier, Torsten","orcid":"0000-0001-8864-2072","last_name":"Meier","first_name":"Torsten","id":"344"},{"full_name":"Hoepker, Jan Philipp","first_name":"Jan Philipp","last_name":"Hoepker"},{"id":"46170","full_name":"Protte, Maximilian","first_name":"Maximilian","last_name":"Protte"},{"full_name":"Eigner, Christof","last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083","first_name":"Christof","id":"13244"},{"id":"26263","first_name":"Christine","last_name":"Silberhorn","full_name":"Silberhorn, Christine"},{"full_name":"Sharapova, Polina R.","last_name":"Sharapova","first_name":"Polina R.","id":"60286"},{"id":"75127","full_name":"Sperling, Jan","last_name":"Sperling","first_name":"Jan","orcid":"0000-0002-5844-3205"},{"id":"49683","full_name":"Bartley, Tim","last_name":"Bartley","first_name":"Tim"}],"year":"2022","title":"Two-Mode Photon-Number Correlations Created by Measurement-Induced Nonlinearity","citation":{"ama":"Meier T, Hoepker JP, Protte M, et al. Two-Mode Photon-Number Correlations Created by Measurement-Induced Nonlinearity. In: Conference on Lasers and Electro-Optics: Applications and Technology. Optica Publishing Group; 2022:JTu3A. 17. doi:10.1364/CLEO_AT.2022.JTu3A.17","bibtex":"@inproceedings{Meier_Hoepker_Protte_Eigner_Silberhorn_Sharapova_Sperling_Bartley_2022, title={Two-Mode Photon-Number Correlations Created by Measurement-Induced Nonlinearity}, DOI={10.1364/CLEO_AT.2022.JTu3A.17}, booktitle={Conference on Lasers and Electro-Optics: Applications and Technology}, publisher={Optica Publishing Group}, author={Meier, Torsten and Hoepker, Jan Philipp and Protte, Maximilian and Eigner, Christof and Silberhorn, Christine and Sharapova, Polina R. and Sperling, Jan and Bartley, Tim}, year={2022}, pages={JTu3A. 17} }","mla":"Meier, Torsten, et al. “Two-Mode Photon-Number Correlations Created by Measurement-Induced Nonlinearity.” Conference on Lasers and Electro-Optics: Applications and Technology, Optica Publishing Group, 2022, p. JTu3A. 17, doi:10.1364/CLEO_AT.2022.JTu3A.17.","short":"T. Meier, J.P. Hoepker, M. Protte, C. Eigner, C. Silberhorn, P.R. Sharapova, J. Sperling, T. Bartley, in: Conference on Lasers and Electro-Optics: Applications and Technology, Optica Publishing Group, 2022, p. JTu3A. 17.","chicago":"Meier, Torsten, Jan Philipp Hoepker, Maximilian Protte, Christof Eigner, Christine Silberhorn, Polina R. Sharapova, Jan Sperling, and Tim Bartley. “Two-Mode Photon-Number Correlations Created by Measurement-Induced Nonlinearity.” In Conference on Lasers and Electro-Optics: Applications and Technology, JTu3A. 17. Optica Publishing Group, 2022. https://doi.org/10.1364/CLEO_AT.2022.JTu3A.17.","apa":"Meier, T., Hoepker, J. P., Protte, M., Eigner, C., Silberhorn, C., Sharapova, P. R., Sperling, J., & Bartley, T. (2022). Two-Mode Photon-Number Correlations Created by Measurement-Induced Nonlinearity. Conference on Lasers and Electro-Optics: Applications and Technology, JTu3A. 17. https://doi.org/10.1364/CLEO_AT.2022.JTu3A.17","ieee":"T. Meier et al., “Two-Mode Photon-Number Correlations Created by Measurement-Induced Nonlinearity,” in Conference on Lasers and Electro-Optics: Applications and Technology, San Jose, California United States, 2022, p. JTu3A. 17, doi: 10.1364/CLEO_AT.2022.JTu3A.17."},"user_id":"16199","_id":"43744","publisher":"Optica Publishing Group","page":"JTu3A. 17","conference":{"end_date":"2022-05-20","start_date":"2022-05-15","name":"CLEO: Applications and Technology 2022","location":"San Jose, California United States"},"status":"public"},{"status":"public","_id":"33484","page":"1359","volume":12,"user_id":"171","citation":{"mla":"Padberg, Laura, et al. “DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking.” Crystals, vol. 12, 2022, p. 1359, doi:10.3390/cryst12101359.","bibtex":"@article{Padberg_Quiring_Bocchini_Santandrea_Gerstmann_Schmidt_Silberhorn_Eigner_2022, title={DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking}, volume={12}, DOI={10.3390/cryst12101359}, journal={Crystals}, author={Padberg, Laura and Quiring, Viktor and Bocchini, Adriana and Santandrea, Matteo and Gerstmann, Uwe and Schmidt, Wolf Gero and Silberhorn, Christine and Eigner, Christof}, year={2022}, pages={1359} }","ama":"Padberg L, Quiring V, Bocchini A, et al. DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking. Crystals. 2022;12:1359. doi:10.3390/cryst12101359","ieee":"L. Padberg et al., “DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking,” Crystals, vol. 12, p. 1359, 2022, doi: 10.3390/cryst12101359.","apa":"Padberg, L., Quiring, V., Bocchini, A., Santandrea, M., Gerstmann, U., Schmidt, W. G., Silberhorn, C., & Eigner, C. (2022). DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking. Crystals, 12, 1359. https://doi.org/10.3390/cryst12101359","short":"L. Padberg, V. Quiring, A. Bocchini, M. Santandrea, U. Gerstmann, W.G. Schmidt, C. Silberhorn, C. Eigner, Crystals 12 (2022) 1359.","chicago":"Padberg, Laura, Viktor Quiring, Adriana Bocchini, Matteo Santandrea, Uwe Gerstmann, Wolf Gero Schmidt, Christine Silberhorn, and Christof Eigner. “DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking.” Crystals 12 (2022): 1359. https://doi.org/10.3390/cryst12101359."},"project":[{"_id":"53","name":"TRR 142: TRR 142"},{"_id":"55","name":"TRR 142 - B: TRR 142 - Project Area B"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"name":"TRR 142 - B07: TRR 142 - Subproject B07","_id":"168"},{"_id":"54","name":"TRR 142 - A: TRR 142 - Project Area A"},{"_id":"166","name":"TRR 142 - A11: TRR 142 - Subproject A11"}],"oa":"1","publication_identifier":{"issn":["2073-4352"]},"author":[{"id":"40300","first_name":"Laura","last_name":"Padberg","full_name":"Padberg, Laura"},{"full_name":"Quiring, Viktor","last_name":"Quiring","first_name":"Viktor"},{"id":"58349","full_name":"Bocchini, Adriana","orcid":"0000-0002-2134-3075","last_name":"Bocchini","first_name":"Adriana"},{"full_name":"Santandrea, Matteo","first_name":"Matteo","last_name":"Santandrea","orcid":"0000-0001-5718-358X","id":"55095"},{"first_name":"Uwe","orcid":"0000-0002-4476-223X","last_name":"Gerstmann","full_name":"Gerstmann, Uwe","id":"171"},{"id":"468","first_name":"Wolf Gero","orcid":"0000-0002-2717-5076","last_name":"Schmidt","full_name":"Schmidt, Wolf Gero"},{"full_name":"Silberhorn, Christine","first_name":"Christine","last_name":"Silberhorn","id":"26263"},{"id":"13244","full_name":"Eigner, Christof","first_name":"Christof","last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083"}],"year":"2022","title":"DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking","intvolume":" 12","date_updated":"2023-04-21T11:07:11Z","language":[{"iso":"eng"}],"main_file_link":[{"open_access":"1"}],"doi":"10.3390/cryst12101359","publication":"Crystals","abstract":[{"lang":"eng","text":"We study the DC conductivity in potassium titanyl phosphate (KTiOPO4, KTP) and its isomorphs KTiOAsO4 (KTA) and Rb1%K99%TiOPO4 (RKTP) and introduce a method by which to reduce the overall ionic conductivity in KTP by a potassium nitrate treatment. Furthermore, we create so-called gray tracking in KTP and investigate the ionic conductivity in theses areas. A local unintended reduction of the ionic conductivity is observed in the gray-tracked regions, which also induce additional optical absorption in the material. We show that a thermal treatment in an oxygen-rich atmosphere removes the gray tracking and brings the ionic conductivity as well as the optical transmission back to the original level. These studies can help to choose the best material and treatment for specific applications."}],"date_created":"2022-09-26T13:12:48Z","department":[{"_id":"15"},{"_id":"288"},{"_id":"623"},{"_id":"170"},{"_id":"295"},{"_id":"230"},{"_id":"429"},{"_id":"35"},{"_id":"790"}],"type":"journal_article"},{"status":"public","_id":"34884","publisher":"American Physical Society (APS)","user_id":"16199","volume":129,"citation":{"mla":"Prasannan, Nidhin, et al. “Direct Measurement of Higher-Order Nonlinear Polarization Squeezing.” Physical Review Letters, vol. 129, no. 26, 263601, American Physical Society (APS), 2022, doi:10.1103/physrevlett.129.263601.","ama":"Prasannan N, Sperling J, Brecht B, Silberhorn C. Direct Measurement of Higher-Order Nonlinear Polarization Squeezing. Physical Review Letters. 2022;129(26). doi:10.1103/physrevlett.129.263601","bibtex":"@article{Prasannan_Sperling_Brecht_Silberhorn_2022, title={Direct Measurement of Higher-Order Nonlinear Polarization Squeezing}, volume={129}, DOI={10.1103/physrevlett.129.263601}, number={26263601}, journal={Physical Review Letters}, publisher={American Physical Society (APS)}, author={Prasannan, Nidhin and Sperling, Jan and Brecht, Benjamin and Silberhorn, Christine}, year={2022} }","apa":"Prasannan, N., Sperling, J., Brecht, B., & Silberhorn, C. (2022). Direct Measurement of Higher-Order Nonlinear Polarization Squeezing. Physical Review Letters, 129(26), Article 263601. https://doi.org/10.1103/physrevlett.129.263601","ieee":"N. Prasannan, J. Sperling, B. Brecht, and C. Silberhorn, “Direct Measurement of Higher-Order Nonlinear Polarization Squeezing,” Physical Review Letters, vol. 129, no. 26, Art. no. 263601, 2022, doi: 10.1103/physrevlett.129.263601.","short":"N. Prasannan, J. Sperling, B. Brecht, C. Silberhorn, Physical Review Letters 129 (2022).","chicago":"Prasannan, Nidhin, Jan Sperling, Benjamin Brecht, and Christine Silberhorn. “Direct Measurement of Higher-Order Nonlinear Polarization Squeezing.” Physical Review Letters 129, no. 26 (2022). https://doi.org/10.1103/physrevlett.129.263601."},"title":"Direct Measurement of Higher-Order Nonlinear Polarization Squeezing","year":"2022","publication_identifier":{"issn":["0031-9007","1079-7114"]},"author":[{"id":"71403","first_name":"Nidhin","last_name":"Prasannan","full_name":"Prasannan, Nidhin"},{"full_name":"Sperling, Jan","orcid":"0000-0002-5844-3205","first_name":"Jan","last_name":"Sperling","id":"75127"},{"id":"27150","full_name":"Brecht, Benjamin","first_name":"Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 "},{"id":"26263","last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine"}],"publication_status":"published","date_updated":"2023-04-20T15:15:18Z","intvolume":" 129","article_number":"263601","language":[{"iso":"eng"}],"doi":"10.1103/physrevlett.129.263601","issue":"26","publication":"Physical Review Letters","date_created":"2022-12-23T07:57:24Z","type":"journal_article","keyword":["General Physics and Astronomy"],"department":[{"_id":"623"},{"_id":"15"},{"_id":"170"},{"_id":"706"},{"_id":"288"},{"_id":"230"},{"_id":"35"}]},{"status":"public","volume":105,"user_id":"68236","_id":"30921","publisher":"American Physical Society (APS)","project":[{"_id":"56","name":"TRR 142 - C: TRR 142 - Project Area C"},{"name":"TRR 142: TRR 142","_id":"53"}],"citation":{"mla":"Held, Philip, et al. “Driven Gaussian Quantum Walks.” Physical Review A, vol. 105, no. 4, 042210, American Physical Society (APS), 2022, doi:10.1103/physreva.105.042210.","bibtex":"@article{Held_Engelkemeier_De_Barkhofen_Sperling_Silberhorn_2022, title={Driven Gaussian quantum walks}, volume={105}, DOI={10.1103/physreva.105.042210}, number={4042210}, journal={Physical Review A}, publisher={American Physical Society (APS)}, author={Held, Philip and Engelkemeier, Melanie and De, Syamsundar and Barkhofen, Sonja and Sperling, Jan and Silberhorn, Christine}, year={2022} }","ama":"Held P, Engelkemeier M, De S, Barkhofen S, Sperling J, Silberhorn C. Driven Gaussian quantum walks. Physical Review A. 2022;105(4). doi:10.1103/physreva.105.042210","ieee":"P. Held, M. Engelkemeier, S. De, S. Barkhofen, J. Sperling, and C. Silberhorn, “Driven Gaussian quantum walks,” Physical Review A, vol. 105, no. 4, Art. no. 042210, 2022, doi: 10.1103/physreva.105.042210.","apa":"Held, P., Engelkemeier, M., De, S., Barkhofen, S., Sperling, J., & Silberhorn, C. (2022). Driven Gaussian quantum walks. Physical Review A, 105(4), Article 042210. https://doi.org/10.1103/physreva.105.042210","short":"P. Held, M. Engelkemeier, S. De, S. Barkhofen, J. Sperling, C. Silberhorn, Physical Review A 105 (2022).","chicago":"Held, Philip, Melanie Engelkemeier, Syamsundar De, Sonja Barkhofen, Jan Sperling, and Christine Silberhorn. “Driven Gaussian Quantum Walks.” Physical Review A 105, no. 4 (2022). https://doi.org/10.1103/physreva.105.042210."},"article_type":"original","intvolume":" 105","publication_status":"published","date_updated":"2026-01-09T09:50:22Z","publication_identifier":{"issn":["2469-9926","2469-9934"]},"author":[{"first_name":"Philip","last_name":"Held","full_name":"Held, Philip","id":"68236"},{"full_name":"Engelkemeier, Melanie","first_name":"Melanie","last_name":"Engelkemeier"},{"last_name":"De","first_name":"Syamsundar","full_name":"De, Syamsundar"},{"full_name":"Barkhofen, Sonja","last_name":"Barkhofen","first_name":"Sonja","id":"48188"},{"last_name":"Sperling","first_name":"Jan","orcid":"0000-0002-5844-3205","full_name":"Sperling, Jan","id":"75127"},{"id":"26263","last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine"}],"year":"2022","title":"Driven Gaussian quantum walks","doi":"10.1103/physreva.105.042210","language":[{"iso":"eng"}],"article_number":"042210","main_file_link":[{"url":"https://journals.aps.org/pra/abstract/10.1103/PhysRevA.105.042210"}],"abstract":[{"lang":"eng","text":"Quantum walks function as essential means to implement quantum simulators, allowing one to study complex and often directly inaccessible quantum processes in controllable systems. In this contribution, the notion of a driven Gaussian quantum walk is introduced. In contrast to typically considered quantum walks in optical settings, we describe the operation of the walk in terms of a nonlinear map rather than a unitary operation, e.g., by replacing a beam-splitter-type coin with a two-mode squeezer, being a process that is controlled and driven by a pump field. This opens previously unattainable possibilities for quantum walks that include nonlinear elements as core components of their operation, vastly extending their range of applications. A full framework for driven Gaussian quantum walks is developed, including methods to dynamically characterize nonlinear, quantum, and quantum-nonlinear effects. Moreover, driven Gaussian quantum walks are compared with their classically interfering and linear counterparts, which are based on classical coherence of light rather than quantum superpositions. In particular, the generation and boost of highly multimode entanglement, squeezing, and other quantum effects are studied over the duration of the nonlinear walk. Importantly, we prove the quantumness of the evolution itself, regardless of the input state. A scheme for an experimental realization is proposed. Furthermore, nonlinear properties of driven Gaussian quantum walks are explored, such as amplification that leads to an ever increasing number of correlated quantum particles, constituting a source of new walkers during the walk. Therefore, a concept for quantum walks is proposed that leads to—and even produces—directly accessible quantum phenomena, and that renders the quantum simulation of nonlinear processes possible."}],"publication":"Physical Review A","issue":"4","department":[{"_id":"623"},{"_id":"15"},{"_id":"170"},{"_id":"706"},{"_id":"288"},{"_id":"230"},{"_id":"429"},{"_id":"35"}],"type":"journal_article","date_created":"2022-04-20T06:38:07Z"}]