Spectral Hong-Ou-Mandel effect between a heralded single-photon state and a thermal field : multiphoton contamination and the nonclassicality threshold

Kashi, Anahita Khodadad and Caspani, Lucia and Kues, Michael (2023) Spectral Hong-Ou-Mandel effect between a heralded single-photon state and a thermal field : multiphoton contamination and the nonclassicality threshold. Physical Review Letters, 131. 233601. ISSN 1079-7114 (https://doi.org/10.1103/PhysRevLett.131.233601)

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Abstract

The Hong-Ou-Mandel (HOM) effect is crucial for quantum information processing, and its visibility determines the system's quantum-classical characteristics. In an experimental and theoretical study of the spectral HOM effect between a thermal field and a heralded single-photon state, we demonstrate that the HOM visibility varies dependent on the relative photon statistics of the interacting fields. Our findings reveal that multiphoton components in a heralded state get engaged in quantum interference with a thermal field, resulting in improved visibilities at certain mean photon numbers. We derive a theoretical relationship for the HOM visibility as a function of the mean photon number of the thermal field and the thermal part of the heralded state. We show that the nonclassicality degree of a heralded state is reflected in its HOM visibility with a thermal field; our results establish a lower bound of 41.42% for the peak visibility, indicating the minimum assignable degree of nonclassicality to the heralded state. This research enhances our understanding of the HOM effect and its application to high-speed remote secret key sharing, addressing security concerns due to multiphoton contamination in heralded states.

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• Item metadata

  Item type:	Article
  ID code:	88348
  Dates:	Date Event 8 December 2023 Published 4 December 2023 Published Online 16 October 2023 Accepted
  Subjects:	Science > Physics
  Department:	Faculty of Science > Physics > Institute of Photonics
  Depositing user:	Pure Administrator
  Date deposited:	05 Mar 2024 16:50
  Last modified:	09 Apr 2024 04:28
  URI:	https://strathprints.strath.ac.uk/id/eprint/88348