---
_id: '62911'
abstract:
- lang: eng
  text: <jats:p>In this paper, we theoretically study the spectral and temporal properties
    of pulsed spontaneous parametric down-conversion (SPDC) generated in lossy waveguides.
    Our theoretical approach is based on the formalism of Gaussian states and the
    Langevin equation, which is elaborated for weak parametric down-conversion and
    photon-number-unresolved click detection. Using the example of frequency-degenerate
    type-II SPDC generated under the pump-idler group-velocity-matching condition,
    we show how the joint-spectral intensity, mode structure, normalized second-order
    correlation function, and Hong-Ou-Mandel interference pattern depend on internal
    losses of the SPDC process. We found that the joint-spectral intensity is almost
    insensitive to internal losses, while the second-order correlation function shows
    a strong dependence on them, being different for the signal and idler beams in
    the presence of internal losses. Based on the sensitivity of the normalized second-order
    correlation function, we show how its measurement can be used to experimentally
    determine internal losses.</jats:p>
article_number: '033122'
author:
- first_name: Denis A.
  full_name: Kopylov, Denis A.
  last_name: Kopylov
- first_name: Michael
  full_name: Stefszky, Michael
  id: '42777'
  last_name: Stefszky
- first_name: Torsten
  full_name: Meier, Torsten
  id: '344'
  last_name: Meier
  orcid: 0000-0001-8864-2072
- first_name: Christine
  full_name: Silberhorn, Christine
  id: '26263'
  last_name: Silberhorn
- first_name: Polina R.
  full_name: Sharapova, Polina R.
  id: '60286'
  last_name: Sharapova
citation:
  ama: 'Kopylov DA, Stefszky M, Meier T, Silberhorn C, Sharapova PR. Spectral and
    temporal properties of type-II parametric down-conversion: The impact of losses
    during state generation. <i>Physical Review Research</i>. 2025;7(3). doi:<a href="https://doi.org/10.1103/zp72-7qwl">10.1103/zp72-7qwl</a>'
  apa: 'Kopylov, D. A., Stefszky, M., Meier, T., Silberhorn, C., &#38; Sharapova,
    P. R. (2025). Spectral and temporal properties of type-II parametric down-conversion:
    The impact of losses during state generation. <i>Physical Review Research</i>,
    <i>7</i>(3), Article 033122. <a href="https://doi.org/10.1103/zp72-7qwl">https://doi.org/10.1103/zp72-7qwl</a>'
  bibtex: '@article{Kopylov_Stefszky_Meier_Silberhorn_Sharapova_2025, title={Spectral
    and temporal properties of type-II parametric down-conversion: The impact of losses
    during state generation}, volume={7}, DOI={<a href="https://doi.org/10.1103/zp72-7qwl">10.1103/zp72-7qwl</a>},
    number={3033122}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Kopylov, Denis A. and Stefszky, Michael and Meier, Torsten
    and Silberhorn, Christine and Sharapova, Polina R.}, year={2025} }'
  chicago: 'Kopylov, Denis A., Michael Stefszky, Torsten Meier, Christine Silberhorn,
    and Polina R. Sharapova. “Spectral and Temporal Properties of Type-II Parametric
    down-Conversion: The Impact of Losses during State Generation.” <i>Physical Review
    Research</i> 7, no. 3 (2025). <a href="https://doi.org/10.1103/zp72-7qwl">https://doi.org/10.1103/zp72-7qwl</a>.'
  ieee: 'D. A. Kopylov, M. Stefszky, T. Meier, C. Silberhorn, and P. R. Sharapova,
    “Spectral and temporal properties of type-II parametric down-conversion: The impact
    of losses during state generation,” <i>Physical Review Research</i>, vol. 7, no.
    3, Art. no. 033122, 2025, doi: <a href="https://doi.org/10.1103/zp72-7qwl">10.1103/zp72-7qwl</a>.'
  mla: 'Kopylov, Denis A., et al. “Spectral and Temporal Properties of Type-II Parametric
    down-Conversion: The Impact of Losses during State Generation.” <i>Physical Review
    Research</i>, vol. 7, no. 3, 033122, American Physical Society (APS), 2025, doi:<a
    href="https://doi.org/10.1103/zp72-7qwl">10.1103/zp72-7qwl</a>.'
  short: D.A. Kopylov, M. Stefszky, T. Meier, C. Silberhorn, P.R. Sharapova, Physical
    Review Research 7 (2025).
date_created: 2025-12-05T09:33:36Z
date_updated: 2025-12-05T09:55:22Z
department:
- _id: '15'
- _id: '569'
- _id: '170'
- _id: '293'
- _id: '288'
- _id: '230'
- _id: '623'
- _id: '429'
- _id: '35'
doi: 10.1103/zp72-7qwl
intvolume: '         7'
issue: '3'
language:
- iso: eng
project:
- _id: '266'
  name: 'PhoQC: Photonisches Quantencomputing'
- _id: '53'
  name: 'TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten
    zu funktionellen Strukturen'
- _id: '56'
  name: TRR 142 - Project Area C
- _id: '174'
  name: 'TRR 142 ; TP: C10: Erzeugung und Charakterisierung von Quantenlicht in nichtlinearen
    Systemen: Eine theoretische Analyse'
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: 'Spectral and temporal properties of type-II parametric down-conversion: The
  impact of losses during state generation'
type: journal_article
user_id: '16199'
volume: 7
year: '2025'
...