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  • Letter

Spatial separation of collinearly emitted broadband frequency-correlated photon pairs

Yuki Kamei*, Cao Bo*, Ryo Okamoto*, and Shigeki Takeuchi†

  • Department of Electronic Science and Engineering, Kyoto University, Kyotodaigakukatsura, Nishikyo-ku, Kyoto 615-8510, Japan

  • *These authors contributed equally to this work.
  • †takeuchi@kuee.kyoto-u.ac.jp
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Phys. Rev. A 107, L010601 – Published 10 January, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.L010601

Abstract

We experimentally study the separation of broadband photon pairs that share the same properties in all degrees of freedom. We find that broadband photon pairs with a bandwidth of about 90 nm can be efficiently separated using time-reversed Hong-Ou-Mandel (HOM) interference. The frequency correlation of the separated photons is verified through joint spectral intensity measurements. The visibility of the HOM interference between the separated photons is shown to be higher than the classical limit of 50%, ensuring that the separated photons are indistinguishable. These results may contribute to improving the performance of quantum sensing and quantum communication.

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Phys. Rev. A 107, L010601– Published 10 January, 2023
  • Received 8 August 2022
  • Accepted 15 December 2022
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