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Quantum State Tomography of Qudits via Hong-Ou-Mandel Interference

Yoshiaki Tsujimoto1,*, Rikizo Ikuta2,3, Kentaro Wakui1, Toshiki Kobayashi2,3, and Mikio Fujiwara1

  • 1Advanced ICT Research Institute, National Institute of Information and Communications Technology (NICT), Koganei, Tokyo 184-8795, Japan
  • 2Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
  • 3Center for Quantum Information and Quantum Biology, Osaka University, Osaka 560-8531, Japan

  • *tsujimoto@nict.go.jp
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Phys. Rev. Applied 19, 014008 – Published 4 January, 2023

DOI: https://doi.org/10.1103/PhysRevApplied.19.014008

Abstract

We propose a method to perform the quantum state tomography (QST) of an n-partite qudit state embedded in single photons based on the Hong-Ou-Mandel interference between the target photon and ancillary probe light. Our method requires only passive beam splitters in the target modes by shifting all of the active devices used in conventional QST methods to the probe preparation system. This feature is useful when the active optical devices for QST have large optical losses. Moreover, even when the probe is prepared by a laser light having a mode mismatch with the target photon, the method offers an accurate estimation of the target state. As a proof-of-principle, we perform the experimental demonstration using a polarization qubit. Regardless of the photon statistics of the probe light, the estimated results of state reconstruction are as accurate as those verified by the conventional QST.

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Outline

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Phys. Rev. Applied 19, 014008– Published 4 January, 2023
  • Received 19 May 2022
  • Revised 14 October 2022
  • Accepted 28 November 2022
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