---
_id: '30210'
abstract:
- lang: eng
  text: Lithium niobate on insulator (LNOI) has a great potential for photonic integrated
    circuits, providing substantial versatility in design of various integrated components.
    To properly use these components in the implementation of different quantum protocols,
    photons with different properties are required. In this paper, we theoretically
    demonstrate a flexible source of correlated photons built on the LNOI waveguide
    of a special geometry. This source is based on the parametric down-conversion
    (PDC) process, in which the signal and idler photons are generated at the telecom
    wavelength and have different spatial profiles and polarizations, but the same
    group velocities. Distinguishability in polarizations and spatial profiles facilitates
    the routing and manipulating individual photons, while the equality of their group
    velocities leads to the absence of temporal walk-off between photons. We show
    how the spectral properties of the generated photons and the number of their frequency
    modes can be controlled depending on the pump characteristics and the waveguide
    length. Finally, we discuss special regimes, in which narrowband light with strong
    frequency correlations and polarization-entangled Bell states are generated at
    the telecom wavelength.
author:
- first_name: Lena
  full_name: Ebers, Lena
  id: '40428'
  last_name: Ebers
- first_name: Alessandro
  full_name: Ferreri, Alessandro
  id: '65609'
  last_name: Ferreri
- first_name: Manfred
  full_name: Hammer, Manfred
  id: '48077'
  last_name: Hammer
  orcid: 0000-0002-6331-9348
- first_name: Maximilian
  full_name: Albert, Maximilian
  last_name: Albert
- first_name: Cedrik
  full_name: Meier, Cedrik
  id: '20798'
  last_name: Meier
  orcid: https://orcid.org/0000-0002-3787-3572
- first_name: Jens
  full_name: Förstner, Jens
  id: '158'
  last_name: Förstner
  orcid: 0000-0001-7059-9862
- first_name: Polina R.
  full_name: Sharapova, Polina R.
  id: '60286'
  last_name: Sharapova
citation:
  ama: 'Ebers L, Ferreri A, Hammer M, et al. Flexible source of correlated photons
    based on LNOI rib waveguides. <i>Journal of Physics: Photonics</i>. 2022;4:025001.
    doi:<a href="https://doi.org/10.1088/2515-7647/ac5a5b">10.1088/2515-7647/ac5a5b</a>'
  apa: 'Ebers, L., Ferreri, A., Hammer, M., Albert, M., Meier, C., Förstner, J., &#38;
    Sharapova, P. R. (2022). Flexible source of correlated photons based on LNOI rib
    waveguides. <i>Journal of Physics: Photonics</i>, <i>4</i>, 025001. <a href="https://doi.org/10.1088/2515-7647/ac5a5b">https://doi.org/10.1088/2515-7647/ac5a5b</a>'
  bibtex: '@article{Ebers_Ferreri_Hammer_Albert_Meier_Förstner_Sharapova_2022, title={Flexible
    source of correlated photons based on LNOI rib waveguides}, volume={4}, DOI={<a
    href="https://doi.org/10.1088/2515-7647/ac5a5b">10.1088/2515-7647/ac5a5b</a>},
    journal={Journal of Physics: Photonics}, publisher={IOP Publishing}, author={Ebers,
    Lena and Ferreri, Alessandro and Hammer, Manfred and Albert, Maximilian and Meier,
    Cedrik and Förstner, Jens and Sharapova, Polina R.}, year={2022}, pages={025001}
    }'
  chicago: 'Ebers, Lena, Alessandro Ferreri, Manfred Hammer, Maximilian Albert, Cedrik
    Meier, Jens Förstner, and Polina R. Sharapova. “Flexible Source of Correlated
    Photons Based on LNOI Rib Waveguides.” <i>Journal of Physics: Photonics</i> 4
    (2022): 025001. <a href="https://doi.org/10.1088/2515-7647/ac5a5b">https://doi.org/10.1088/2515-7647/ac5a5b</a>.'
  ieee: 'L. Ebers <i>et al.</i>, “Flexible source of correlated photons based on LNOI
    rib waveguides,” <i>Journal of Physics: Photonics</i>, vol. 4, p. 025001, 2022,
    doi: <a href="https://doi.org/10.1088/2515-7647/ac5a5b">10.1088/2515-7647/ac5a5b</a>.'
  mla: 'Ebers, Lena, et al. “Flexible Source of Correlated Photons Based on LNOI Rib
    Waveguides.” <i>Journal of Physics: Photonics</i>, vol. 4, IOP Publishing, 2022,
    p. 025001, doi:<a href="https://doi.org/10.1088/2515-7647/ac5a5b">10.1088/2515-7647/ac5a5b</a>.'
  short: 'L. Ebers, A. Ferreri, M. Hammer, M. Albert, C. Meier, J. Förstner, P.R.
    Sharapova, Journal of Physics: Photonics 4 (2022) 025001.'
date_created: 2022-03-07T09:51:50Z
date_updated: 2025-12-16T11:31:04Z
department:
- _id: '61'
- _id: '230'
- _id: '429'
- _id: '15'
- _id: '569'
- _id: '170'
- _id: '287'
- _id: '35'
- _id: '34'
doi: 10.1088/2515-7647/ac5a5b
intvolume: '         4'
keyword:
- tet_topic_waveguide
language:
- iso: eng
page: '025001'
project:
- _id: '56'
  name: 'TRR 142 - C: TRR 142 - Project Area C'
- _id: '75'
  name: 'TRR 142 - C5: TRR 142 - Subproject C5'
- _id: '72'
  name: 'TRR 142 - C2: TRR 142 - Subproject C2'
- _id: '53'
  name: 'TRR 142: TRR 142'
- _id: '53'
  name: 'TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten
    zu funktionellen Strukturen'
publication: 'Journal of Physics: Photonics'
publication_identifier:
  issn:
  - 2515-7647
publication_status: published
publisher: IOP Publishing
related_material:
  link:
  - description: Corrigendum for table C1
    relation: erratum
    url: https://doi.org/10.1088/2515-7647/acc70c
status: public
title: Flexible source of correlated photons based on LNOI rib waveguides
type: journal_article
user_id: '16199'
volume: 4
year: '2022'
...
---
_id: '26889'
author:
- first_name: Kai Hong
  full_name: Luo, Kai Hong
  id: '36389'
  last_name: Luo
  orcid: 0000-0003-1008-4976
- first_name: Matteo
  full_name: Santandrea, Matteo
  id: '55095'
  last_name: Santandrea
  orcid: 0000-0001-5718-358X
- first_name: Michael
  full_name: Stefszky, Michael
  id: '42777'
  last_name: Stefszky
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
- first_name: Marcello
  full_name: Massaro, Marcello
  id: '59545'
  last_name: Massaro
  orcid: 0000-0002-2539-7652
- first_name: Alessandro
  full_name: Ferreri, Alessandro
  id: '65609'
  last_name: Ferreri
- first_name: Polina
  full_name: Sharapova, Polina
  id: '60286'
  last_name: Sharapova
- 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: 'Luo KH, Santandrea M, Stefszky M, et al. Quantum optical coherence: From linear
    to nonlinear interferometers. <i>Physical Review A</i>. Published online 2021.
    doi:<a href="https://doi.org/10.1103/physreva.104.043707">10.1103/physreva.104.043707</a>'
  apa: 'Luo, K. H., Santandrea, M., Stefszky, M., Sperling, J., Massaro, M., Ferreri,
    A., Sharapova, P., Herrmann, H., &#38; Silberhorn, C. (2021). Quantum optical
    coherence: From linear to nonlinear interferometers. <i>Physical Review A</i>.
    <a href="https://doi.org/10.1103/physreva.104.043707">https://doi.org/10.1103/physreva.104.043707</a>'
  bibtex: '@article{Luo_Santandrea_Stefszky_Sperling_Massaro_Ferreri_Sharapova_Herrmann_Silberhorn_2021,
    title={Quantum optical coherence: From linear to nonlinear interferometers}, DOI={<a
    href="https://doi.org/10.1103/physreva.104.043707">10.1103/physreva.104.043707</a>},
    journal={Physical Review A}, author={Luo, Kai Hong and Santandrea, Matteo and
    Stefszky, Michael and Sperling, Jan and Massaro, Marcello and Ferreri, Alessandro
    and Sharapova, Polina and Herrmann, Harald and Silberhorn, Christine}, year={2021}
    }'
  chicago: 'Luo, Kai Hong, Matteo Santandrea, Michael Stefszky, Jan Sperling, Marcello
    Massaro, Alessandro Ferreri, Polina Sharapova, Harald Herrmann, and Christine
    Silberhorn. “Quantum Optical Coherence: From Linear to Nonlinear Interferometers.”
    <i>Physical Review A</i>, 2021. <a href="https://doi.org/10.1103/physreva.104.043707">https://doi.org/10.1103/physreva.104.043707</a>.'
  ieee: 'K. H. Luo <i>et al.</i>, “Quantum optical coherence: From linear to nonlinear
    interferometers,” <i>Physical Review A</i>, 2021, doi: <a href="https://doi.org/10.1103/physreva.104.043707">10.1103/physreva.104.043707</a>.'
  mla: 'Luo, Kai Hong, et al. “Quantum Optical Coherence: From Linear to Nonlinear
    Interferometers.” <i>Physical Review A</i>, 2021, doi:<a href="https://doi.org/10.1103/physreva.104.043707">10.1103/physreva.104.043707</a>.'
  short: K.H. Luo, M. Santandrea, M. Stefszky, J. Sperling, M. Massaro, A. Ferreri,
    P. Sharapova, H. Herrmann, C. Silberhorn, Physical Review A (2021).
date_created: 2021-10-26T12:42:16Z
date_updated: 2023-04-20T15:08:25Z
department:
- _id: '15'
- _id: '170'
- _id: '569'
- _id: '706'
- _id: '288'
- _id: '230'
- _id: '429'
- _id: '35'
doi: 10.1103/physreva.104.043707
language:
- iso: eng
project:
- _id: '53'
  name: 'TRR 142: TRR 142'
- _id: '56'
  name: 'TRR 142 - C: TRR 142 - Project Area C'
- _id: '72'
  name: 'TRR 142 - C2: TRR 142 - Subproject C2'
publication: Physical Review A
publication_identifier:
  issn:
  - 2469-9926
  - 2469-9934
publication_status: published
status: public
title: 'Quantum optical coherence: From linear to nonlinear interferometers'
type: journal_article
user_id: '16199'
year: '2021'
...
---
_id: '26077'
abstract:
- lang: eng
  text: <jats:p>Nonlinear SU(1,1) interferometers are fruitful and promising tools
    for spectral engineering and precise measurements with phase sensitivity below
    the classical bound. Such interferometers have been successfully realized in bulk
    and fiber-based configurations. However, rapidly developing integrated technologies
    provide higher efficiencies, smaller footprints, and pave the way to quantum-enhanced
    on-chip interferometry. In this work, we theoretically realised an integrated
    architecture of the multimode SU(1,1) interferometer which can be applied to various
    integrated platforms. The presented interferometer includes a polarization converter
    between two photon sources and utilizes a continuous-wave (CW) pump. Based on
    the potassium titanyl phosphate (KTP) platform, we show that this configuration
    results in almost perfect destructive interference at the output and supersensitivity
    regions below the classical limit. In addition, we discuss the fundamental difference
    between single-mode and highly multimode SU(1,1) interferometers in the properties
    of phase sensitivity and its limits. Finally, we explore how to improve the phase
    sensitivity by filtering the output radiation and using different seeding states
    in different modes with various detection strategies.</jats:p>
article_number: '461'
author:
- first_name: Alessandro
  full_name: Ferreri, Alessandro
  id: '65609'
  last_name: Ferreri
- first_name: Matteo
  full_name: Santandrea, Matteo
  id: '55095'
  last_name: Santandrea
  orcid: 0000-0001-5718-358X
- first_name: Michael
  full_name: Stefszky, Michael
  id: '42777'
  last_name: Stefszky
- first_name: Kai Hong
  full_name: Luo, Kai Hong
  id: '36389'
  last_name: Luo
  orcid: 0000-0003-1008-4976
- 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: Polina R.
  full_name: Sharapova, Polina R.
  id: '60286'
  last_name: Sharapova
citation:
  ama: Ferreri A, Santandrea M, Stefszky M, et al. Spectrally multimode integrated
    SU(1,1) interferometer. <i>Quantum</i>. Published online 2021. doi:<a href="https://doi.org/10.22331/q-2021-05-27-461">10.22331/q-2021-05-27-461</a>
  apa: Ferreri, A., Santandrea, M., Stefszky, M., Luo, K. H., Herrmann, H., Silberhorn,
    C., &#38; Sharapova, P. R. (2021). Spectrally multimode integrated SU(1,1) interferometer.
    <i>Quantum</i>, Article 461. <a href="https://doi.org/10.22331/q-2021-05-27-461">https://doi.org/10.22331/q-2021-05-27-461</a>
  bibtex: '@article{Ferreri_Santandrea_Stefszky_Luo_Herrmann_Silberhorn_Sharapova_2021,
    title={Spectrally multimode integrated SU(1,1) interferometer}, DOI={<a href="https://doi.org/10.22331/q-2021-05-27-461">10.22331/q-2021-05-27-461</a>},
    number={461}, journal={Quantum}, author={Ferreri, Alessandro and Santandrea, Matteo
    and Stefszky, Michael and Luo, Kai Hong and Herrmann, Harald and Silberhorn, Christine
    and Sharapova, Polina R.}, year={2021} }'
  chicago: Ferreri, Alessandro, Matteo Santandrea, Michael Stefszky, Kai Hong Luo,
    Harald Herrmann, Christine Silberhorn, and Polina R. Sharapova. “Spectrally Multimode
    Integrated SU(1,1) Interferometer.” <i>Quantum</i>, 2021. <a href="https://doi.org/10.22331/q-2021-05-27-461">https://doi.org/10.22331/q-2021-05-27-461</a>.
  ieee: 'A. Ferreri <i>et al.</i>, “Spectrally multimode integrated SU(1,1) interferometer,”
    <i>Quantum</i>, Art. no. 461, 2021, doi: <a href="https://doi.org/10.22331/q-2021-05-27-461">10.22331/q-2021-05-27-461</a>.'
  mla: Ferreri, Alessandro, et al. “Spectrally Multimode Integrated SU(1,1) Interferometer.”
    <i>Quantum</i>, 461, 2021, doi:<a href="https://doi.org/10.22331/q-2021-05-27-461">10.22331/q-2021-05-27-461</a>.
  short: A. Ferreri, M. Santandrea, M. Stefszky, K.H. Luo, H. Herrmann, C. Silberhorn,
    P.R. Sharapova, Quantum (2021).
date_created: 2021-10-12T08:46:46Z
date_updated: 2026-01-16T10:22:10Z
department:
- _id: '15'
- _id: '288'
doi: 10.22331/q-2021-05-27-461
language:
- iso: eng
project:
- _id: '56'
  name: 'TRR 142 - C: TRR 142 - Project Area C'
publication: Quantum
publication_identifier:
  issn:
  - 2521-327X
publication_status: published
status: public
title: Spectrally multimode integrated SU(1,1) interferometer
type: journal_article
user_id: '42777'
year: '2021'
...
---
_id: '40384'
article_number: '053829'
author:
- first_name: Alessandro
  full_name: Ferreri, Alessandro
  id: '65609'
  last_name: Ferreri
- first_name: V.
  full_name: Ansari, V.
  last_name: Ansari
- 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: Ferreri A, Ansari V, Silberhorn C, Sharapova PR. Temporally multimode four-photon
    Hong-Ou-Mandel interference. <i>Physical Review A</i>. 2019;100(5). doi:<a href="https://doi.org/10.1103/physreva.100.053829">10.1103/physreva.100.053829</a>
  apa: Ferreri, A., Ansari, V., Silberhorn, C., &#38; Sharapova, P. R. (2019). Temporally
    multimode four-photon Hong-Ou-Mandel interference. <i>Physical Review A</i>, <i>100</i>(5),
    Article 053829. <a href="https://doi.org/10.1103/physreva.100.053829">https://doi.org/10.1103/physreva.100.053829</a>
  bibtex: '@article{Ferreri_Ansari_Silberhorn_Sharapova_2019, title={Temporally multimode
    four-photon Hong-Ou-Mandel interference}, volume={100}, DOI={<a href="https://doi.org/10.1103/physreva.100.053829">10.1103/physreva.100.053829</a>},
    number={5053829}, journal={Physical Review A}, publisher={American Physical Society
    (APS)}, author={Ferreri, Alessandro and Ansari, V. and Silberhorn, Christine and
    Sharapova, Polina R.}, year={2019} }'
  chicago: Ferreri, Alessandro, V. Ansari, Christine Silberhorn, and Polina R. Sharapova.
    “Temporally Multimode Four-Photon Hong-Ou-Mandel Interference.” <i>Physical Review
    A</i> 100, no. 5 (2019). <a href="https://doi.org/10.1103/physreva.100.053829">https://doi.org/10.1103/physreva.100.053829</a>.
  ieee: 'A. Ferreri, V. Ansari, C. Silberhorn, and P. R. Sharapova, “Temporally multimode
    four-photon Hong-Ou-Mandel interference,” <i>Physical Review A</i>, vol. 100,
    no. 5, Art. no. 053829, 2019, doi: <a href="https://doi.org/10.1103/physreva.100.053829">10.1103/physreva.100.053829</a>.'
  mla: Ferreri, Alessandro, et al. “Temporally Multimode Four-Photon Hong-Ou-Mandel
    Interference.” <i>Physical Review A</i>, vol. 100, no. 5, 053829, American Physical
    Society (APS), 2019, doi:<a href="https://doi.org/10.1103/physreva.100.053829">10.1103/physreva.100.053829</a>.
  short: A. Ferreri, V. Ansari, C. Silberhorn, P.R. Sharapova, Physical Review A 100
    (2019).
date_created: 2023-01-26T14:12:28Z
date_updated: 2025-12-16T11:28:33Z
department:
- _id: '15'
- _id: '569'
- _id: '170'
- _id: '288'
- _id: '230'
- _id: '429'
- _id: '35'
doi: 10.1103/physreva.100.053829
intvolume: '       100'
issue: '5'
language:
- iso: eng
project:
- _id: '53'
  name: 'TRR 142: TRR 142'
- _id: '56'
  name: 'TRR 142 - C: TRR 142 - Project Area C'
- _id: '72'
  name: 'TRR 142 - C2: TRR 142 - Subproject C2'
publication: Physical Review A
publication_identifier:
  issn:
  - 2469-9926
  - 2469-9934
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Temporally multimode four-photon Hong-Ou-Mandel interference
type: journal_article
user_id: '16199'
volume: 100
year: '2019'
...