---
_id: '54544'
abstract:
- lang: eng
  text: The biphoton correlation time, a measure for the conditional uncertainty in
    the temporal arrival of two photons from a photon pair source, is a key performance
    identifier for many quantum spectroscopy applications, with shorter correlation
    times typically yielding better performance. Furthermore, it provides fundamental
    insight into the effects of dispersion on the biphoton state. Here, we show that
    a characteristic dependence of the width of the temporal interferogram can be
    exploited to obtain insights into the amount of second-order dispersion inside
    the interferometer and to retrieve actual and Fourier-limited ultrashort biphoton
    correlation times of around 100 fs. In the presented scheme, we simultaneously
    measure spectral and temporal interferograms at the output of an SU(1,1) interferometer
    based on an integrated broadband parametric down conversion source in a Ti:LiNbO3
    waveguide.
article_number: '020350'
author:
- first_name: Franz
  full_name: Roeder, Franz
  id: '88149'
  last_name: Roeder
- first_name: René
  full_name: Pollmann, René
  id: '78890'
  last_name: Pollmann
- first_name: Michael
  full_name: Stefszky, Michael
  id: '42777'
  last_name: Stefszky
- first_name: Matteo
  full_name: Santandrea, Matteo
  id: '55095'
  last_name: Santandrea
  orcid: 0000-0001-5718-358X
- first_name: Kai Hong
  full_name: Luo, Kai Hong
  id: '36389'
  last_name: Luo
  orcid: 0000-0003-1008-4976
- first_name: V.
  full_name: Quiring, V.
  last_name: Quiring
- first_name: Raimund
  full_name: Ricken, Raimund
  last_name: Ricken
- first_name: Christof
  full_name: Eigner, Christof
  id: '13244'
  last_name: Eigner
  orcid: https://orcid.org/0000-0002-5693-3083
- first_name: Benjamin
  full_name: Brecht, Benjamin
  id: '27150'
  last_name: Brecht
  orcid: '0000-0003-4140-0556 '
- first_name: Christine
  full_name: Silberhorn, Christine
  id: '26263'
  last_name: Silberhorn
citation:
  ama: Roeder F, Pollmann R, Stefszky M, et al. Measurement of Ultrashort Biphoton
    Correlation Times with an Integrated Two-Color Broadband SU(1,1)-Interferometer.
    <i>PRX Quantum</i>. 2024;5(2). doi:<a href="https://doi.org/10.1103/prxquantum.5.020350">10.1103/prxquantum.5.020350</a>
  apa: Roeder, F., Pollmann, R., Stefszky, M., Santandrea, M., Luo, K. H., Quiring,
    V., Ricken, R., Eigner, C., Brecht, B., &#38; Silberhorn, C. (2024). Measurement
    of Ultrashort Biphoton Correlation Times with an Integrated Two-Color Broadband
    SU(1,1)-Interferometer. <i>PRX Quantum</i>, <i>5</i>(2), Article 020350. <a href="https://doi.org/10.1103/prxquantum.5.020350">https://doi.org/10.1103/prxquantum.5.020350</a>
  bibtex: '@article{Roeder_Pollmann_Stefszky_Santandrea_Luo_Quiring_Ricken_Eigner_Brecht_Silberhorn_2024,
    title={Measurement of Ultrashort Biphoton Correlation Times with an Integrated
    Two-Color Broadband SU(1,1)-Interferometer}, volume={5}, DOI={<a href="https://doi.org/10.1103/prxquantum.5.020350">10.1103/prxquantum.5.020350</a>},
    number={2020350}, journal={PRX Quantum}, publisher={American Physical Society
    (APS)}, author={Roeder, Franz and Pollmann, René and Stefszky, Michael and Santandrea,
    Matteo and Luo, Kai Hong and Quiring, V. and Ricken, Raimund and Eigner, Christof
    and Brecht, Benjamin and Silberhorn, Christine}, year={2024} }'
  chicago: Roeder, Franz, René Pollmann, Michael Stefszky, Matteo Santandrea, Kai
    Hong Luo, V. Quiring, Raimund Ricken, Christof Eigner, Benjamin Brecht, and Christine
    Silberhorn. “Measurement of Ultrashort Biphoton Correlation Times with an Integrated
    Two-Color Broadband SU(1,1)-Interferometer.” <i>PRX Quantum</i> 5, no. 2 (2024).
    <a href="https://doi.org/10.1103/prxquantum.5.020350">https://doi.org/10.1103/prxquantum.5.020350</a>.
  ieee: 'F. Roeder <i>et al.</i>, “Measurement of Ultrashort Biphoton Correlation
    Times with an Integrated Two-Color Broadband SU(1,1)-Interferometer,” <i>PRX Quantum</i>,
    vol. 5, no. 2, Art. no. 020350, 2024, doi: <a href="https://doi.org/10.1103/prxquantum.5.020350">10.1103/prxquantum.5.020350</a>.'
  mla: Roeder, Franz, et al. “Measurement of Ultrashort Biphoton Correlation Times
    with an Integrated Two-Color Broadband SU(1,1)-Interferometer.” <i>PRX Quantum</i>,
    vol. 5, no. 2, 020350, American Physical Society (APS), 2024, doi:<a href="https://doi.org/10.1103/prxquantum.5.020350">10.1103/prxquantum.5.020350</a>.
  short: F. Roeder, R. Pollmann, M. Stefszky, M. Santandrea, K.H. Luo, V. Quiring,
    R. Ricken, C. Eigner, B. Brecht, C. Silberhorn, PRX Quantum 5 (2024).
date_created: 2024-06-01T12:48:51Z
date_updated: 2024-06-01T13:00:53Z
department:
- _id: '288'
- _id: '623'
doi: 10.1103/prxquantum.5.020350
intvolume: '         5'
issue: '2'
language:
- iso: eng
project:
- _id: '207'
  grant_number: 13N15065
  name: 'MiLiQuant: Miniaturisierte Lichtquellen für den industriellen Einsatz in
    Quantensensoren und Quanten-Imaging-Systemen (MiLiQuant) - Teilvorhaben: Technologie
    und Theorie für MIR Quanten-Imaging Systeme'
- _id: '571'
  grant_number: '101070700'
  name: 'MIRAQLS: MIRAQLS: Mid-infrared Quantum Technology for Sensing'
- _id: '190'
  name: 'E2TPA: Exploiting Entangled Two-Photon Absorption'
publication: PRX Quantum
publication_identifier:
  issn:
  - 2691-3399
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Measurement of Ultrashort Biphoton Correlation Times with an Integrated Two-Color
  Broadband SU(1,1)-Interferometer
type: journal_article
user_id: '88149'
volume: 5
year: '2024'
...
---
_id: '57862'
abstract:
- lang: eng
  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.
article_number: '123025'
article_type: original
author:
- first_name: Franz
  full_name: Roeder, Franz
  id: '88149'
  last_name: Roeder
- first_name: Abira
  full_name: Gnanavel, Abira
  last_name: Gnanavel
- first_name: René
  full_name: Pollmann, René
  id: '78890'
  last_name: Pollmann
- first_name: Olga
  full_name: Brecht, Olga
  last_name: Brecht
- first_name: Michael
  full_name: Stefszky, Michael
  id: '42777'
  last_name: Stefszky
- first_name: Laura
  full_name: Padberg, Laura
  id: '40300'
  last_name: Padberg
- first_name: Christof
  full_name: Eigner, Christof
  id: '13244'
  last_name: Eigner
  orcid: https://orcid.org/0000-0002-5693-3083
- first_name: Christine
  full_name: Silberhorn, Christine
  id: '26263'
  last_name: Silberhorn
- first_name: Benjamin
  full_name: Brecht, Benjamin
  id: '27150'
  last_name: Brecht
  orcid: '0000-0003-4140-0556 '
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. <i>New Journal of Physics</i>.
    2024;26(12). doi:<a href="https://doi.org/10.1088/1367-2630/ad9f98">10.1088/1367-2630/ad9f98</a>
  apa: Roeder, F., Gnanavel, A., Pollmann, R., Brecht, O., Stefszky, M., Padberg,
    L., Eigner, C., Silberhorn, C., &#38; Brecht, B. (2024). Ultra-broadband non-degenerate
    guided-wave bi-photon source in the near and mid-infrared. <i>New Journal of Physics</i>,
    <i>26</i>(12), Article 123025. <a href="https://doi.org/10.1088/1367-2630/ad9f98">https://doi.org/10.1088/1367-2630/ad9f98</a>
  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={<a href="https://doi.org/10.1088/1367-2630/ad9f98">10.1088/1367-2630/ad9f98</a>},
    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} }'
  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.” <i>New
    Journal of Physics</i> 26, no. 12 (2024). <a href="https://doi.org/10.1088/1367-2630/ad9f98">https://doi.org/10.1088/1367-2630/ad9f98</a>.
  ieee: 'F. Roeder <i>et al.</i>, “Ultra-broadband non-degenerate guided-wave bi-photon
    source in the near and mid-infrared,” <i>New Journal of Physics</i>, vol. 26,
    no. 12, Art. no. 123025, 2024, doi: <a href="https://doi.org/10.1088/1367-2630/ad9f98">10.1088/1367-2630/ad9f98</a>.'
  mla: Roeder, Franz, et al. “Ultra-Broadband Non-Degenerate Guided-Wave Bi-Photon
    Source in the near and Mid-Infrared.” <i>New Journal of Physics</i>, vol. 26,
    no. 12, 123025, IOP Publishing, 2024, doi:<a href="https://doi.org/10.1088/1367-2630/ad9f98">10.1088/1367-2630/ad9f98</a>.
  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).
date_created: 2024-12-27T19:01:14Z
date_updated: 2025-12-19T11:36:36Z
department:
- _id: '288'
- _id: '623'
- _id: '15'
doi: 10.1088/1367-2630/ad9f98
intvolume: '        26'
issue: '12'
language:
- iso: eng
project:
- _id: '571'
  name: 'MIRAQLS: MIRAQLS: Mid-infrared Quantum Technology for Sensing'
- _id: '190'
  name: 'E2TPA: Exploiting Entangled Two-Photon Absorption'
publication: New Journal of Physics
publication_identifier:
  issn:
  - 1367-2630
publication_status: published
publisher: IOP Publishing
status: public
title: Ultra-broadband non-degenerate guided-wave bi-photon source in the near and
  mid-infrared
type: journal_article
user_id: '78890'
volume: 26
year: '2024'
...