---
_id: '54815'
abstract:
- lang: eng
  text: "<jats:p>Broadband quantum light is a vital resource for quantum metrology
    and spectroscopy applications such as quantum optical coherence tomography or
    entangled two photon absorption. For entangled two photon absorption in particular,
    very high photon flux combined with high time-frequency entanglement is crucial
    for observing a signal. So far these conditions could be met by using high power
    lasers driving degenerate, type 0 bulk-crystal spontaneous parametric down conversion
    (SPDC) sources. This naturally limits the available wavelength ranges and precludes
    deterministic splitting of the generated output photons. In this work we demonstrate
    an integrated two-colour SPDC source utilising a group-velocity matched lithium
    niobate waveguide, reaching both exceptional brightness 1.52⋅10<jats:sup>6</jats:sup>pairssmWGHz
    and large bandwidth (7.8 THz FWHM) while pumped with a few mW of continuous wave
    (CW) laser light. By converting a narrow band pump to broadband pulses the created
    photon pairs show correlation times of Δ<jats:italic>τ</jats:italic> ≈ 120 fs
    while maintaining the narrow bandwidth Δ<jats:italic>ω</jats:italic><jats:sub>\r\n
    \     <jats:italic>p</jats:italic>\r\n    </jats:sub> ≪ 1 MHz of the CW pump light,
    yielding strong time-frequency entanglement. Furthermore our process can be adapted
    to a wide range of central wavelengths.</jats:p>"
article_number: '23945'
article_type: original
author:
- first_name: René
  full_name: Pollmann, René
  id: '78890'
  last_name: Pollmann
- first_name: Franz
  full_name: Roeder, Franz
  id: '88149'
  last_name: Roeder
- first_name: Victor
  full_name: Quiring, Victor
  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: Pollmann R, Roeder F, Quiring V, et al. Integrated, bright broadband, two-colour
    parametric down-conversion source. <i>Optics Express</i>. 2024;32(14). doi:<a
    href="https://doi.org/10.1364/oe.522549">10.1364/oe.522549</a>
  apa: Pollmann, R., Roeder, F., Quiring, V., Ricken, R., Eigner, C., Brecht, B.,
    &#38; Silberhorn, C. (2024). Integrated, bright broadband, two-colour parametric
    down-conversion source. <i>Optics Express</i>, <i>32</i>(14), Article 23945. <a
    href="https://doi.org/10.1364/oe.522549">https://doi.org/10.1364/oe.522549</a>
  bibtex: '@article{Pollmann_Roeder_Quiring_Ricken_Eigner_Brecht_Silberhorn_2024,
    title={Integrated, bright broadband, two-colour parametric down-conversion source},
    volume={32}, DOI={<a href="https://doi.org/10.1364/oe.522549">10.1364/oe.522549</a>},
    number={1423945}, journal={Optics Express}, publisher={Optica Publishing Group},
    author={Pollmann, René and Roeder, Franz and Quiring, Victor and Ricken, Raimund
    and Eigner, Christof and Brecht, Benjamin and Silberhorn, Christine}, year={2024}
    }'
  chicago: Pollmann, René, Franz Roeder, Victor Quiring, Raimund Ricken, Christof
    Eigner, Benjamin Brecht, and Christine Silberhorn. “Integrated, Bright Broadband,
    Two-Colour Parametric down-Conversion Source.” <i>Optics Express</i> 32, no. 14
    (2024). <a href="https://doi.org/10.1364/oe.522549">https://doi.org/10.1364/oe.522549</a>.
  ieee: 'R. Pollmann <i>et al.</i>, “Integrated, bright broadband, two-colour parametric
    down-conversion source,” <i>Optics Express</i>, vol. 32, no. 14, Art. no. 23945,
    2024, doi: <a href="https://doi.org/10.1364/oe.522549">10.1364/oe.522549</a>.'
  mla: Pollmann, René, et al. “Integrated, Bright Broadband, Two-Colour Parametric
    down-Conversion Source.” <i>Optics Express</i>, vol. 32, no. 14, 23945, Optica
    Publishing Group, 2024, doi:<a href="https://doi.org/10.1364/oe.522549">10.1364/oe.522549</a>.
  short: R. Pollmann, F. Roeder, V. Quiring, R. Ricken, C. Eigner, B. Brecht, C. Silberhorn,
    Optics Express 32 (2024).
date_created: 2024-06-19T06:58:17Z
date_updated: 2025-12-19T11:37:41Z
department:
- _id: '15'
- _id: '623'
- _id: '288'
doi: 10.1364/oe.522549
intvolume: '        32'
issue: '14'
language:
- iso: eng
publication: Optics Express
publication_identifier:
  issn:
  - 1094-4087
publication_status: published
publisher: Optica Publishing Group
status: public
title: Integrated, bright broadband, two-colour parametric down-conversion source
type: journal_article
user_id: '78890'
volume: 32
year: '2024'
...