Phase Locking between Two All-Optical Quantum Memories

Fumiya Okamoto, Mamoru Endo, Mikihisa Matsuyama, Yuya Ishizuka, Yang Liu, Rei Sakakibara, Yosuke Hashimoto, Jun-ichi Yoshikawa, Peter van Loock, and Akira Furusawa
Phys. Rev. Lett. 125, 260508 – Published 31 December 2020
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Abstract

Optical approaches to quantum computation require the creation of multimode photonic quantum states in a controlled fashion. Here we experimentally demonstrate phase locking of two all-optical quantum memories, based on a concatenated cavity system with phase reference beams, for the time-controlled release of two-mode entangled single-photon states. The release time for each mode can be independently determined. The generated states are characterized by two-mode optical homodyne tomography. Entanglement and nonclassicality are preserved for release-time differences up to 400 ns, confirmed by logarithmic negativities and Wigner-function negativities, respectively.

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  • Received 16 September 2020
  • Accepted 2 December 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.260508

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyAtomic, Molecular & Optical

Authors & Affiliations

Fumiya Okamoto1, Mamoru Endo1,*, Mikihisa Matsuyama1, Yuya Ishizuka1, Yang Liu2, Rei Sakakibara1, Yosuke Hashimoto1, Jun-ichi Yoshikawa1,†, Peter van Loock3, and Akira Furusawa1,‡

  • 1Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • 2State Key Laboratory of Quantum Optics and Quantum Optics Devices, Collaborative Innovation Center of Extreme Optics, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
  • 3Institute of Physics, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, 55099 Mainz, Germany

  • *endo@ap.t.u-tokyo.ac.jp
  • yoshikawa@ap.t.u-tokyo.ac.jp
  • akiraf@ap.t.u-tokyo.ac.jp

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Issue

Vol. 125, Iss. 26 — 31 December 2020

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