Quantum repeater for continuous-variable entanglement distribution

Josephine Dias, Matthew S. Winnel, Nedasadat Hosseinidehaj, and Timothy C. Ralph
Phys. Rev. A 102, 052425 – Published 30 November 2020

Abstract

Quantum repeaters have been proposed as a way of extending the reach of quantum communication. First-generation approaches use entanglement swapping to connect entangled links along a long-distance channel. Recently, there have been proposals for first-generation quantum repeaters for continuous variables. In this paper, we present an improved continuous-variable (CV) repeater scheme using optimal Gaussian entanglement swapping. Our scheme uses the noiseless linear amplifier for entanglement distillation. We show that with the simplest configuration of the noiseless linear amplifier and under the assumption of good quantum memories and perfect sources and detectors, our scheme beats the direct transmission upper limit for shorter distances and can offer advantages over previous CV repeater schemes.

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  • Received 14 April 2020
  • Revised 14 October 2020
  • Accepted 10 November 2020

DOI:https://doi.org/10.1103/PhysRevA.102.052425

©2020 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Josephine Dias1,*, Matthew S. Winnel2, Nedasadat Hosseinidehaj2, and Timothy C. Ralph2

  • 1National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda, Tokyo 101-0003, Japan
  • 2Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, University of Queensland, Brisbane, Queensland 4072, Australia

  • *jdias@nii.ac.jp

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Vol. 102, Iss. 5 — November 2020

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