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Repeater-enhanced distributed quantum sensing based on continuous-variable multipartite entanglement

Yi Xia, Quntao Zhuang, William Clark, and Zheshen Zhang
Phys. Rev. A 99, 012328 – Published 17 January 2019

Abstract

Entanglement is a unique resource for quantum-enhanced applications. When employed in sensing, shared entanglement between distributed quantum sensors enables a substantial gain in the measurement sensitivity in estimating global parameters of the quantum sensor network. Loss incurred in the distribution of entanglement, however, quickly dissipates the measurement-sensitivity advantage enjoyed by the entangled quantum sensors over sensors supplied with local quantum resources. Here we present a viable approach to overcome the entanglement-distribution loss and show that the measurement sensitivity enabled by entangled quantum sensors beats that afforded by the optimum local resource. Our approach relies on noiseless linear amplifiers (NLAs) to serve as quantum repeaters. We show that, unlike the outstanding challenge of building quantum repeaters to suppress the repeaterless bound for quantum key distribution, NLA-based quantum repeaters for distributed quantum sensing are realizable by available technology. As such, distributed quantum sensing would become an application instance that benefits from quantum repeaters.

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  • Received 18 October 2018

DOI:https://doi.org/10.1103/PhysRevA.99.012328

©2019 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Yi Xia1,*, Quntao Zhuang2, William Clark3, and Zheshen Zhang1,4

  • 1College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA
  • 2Department of Physics, University of California, Berkeley, Berkeley, California 94720, USA
  • 3General Dynamics Mission Systems, 8220 East Roosevelt Street, Scottsdale, Arizona 85257, USA
  • 4Department of Materials Science and Engineering, University of Arizona, Tucson, Arizona 85721, USA

  • *yixia@email.arizona.edu

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Issue

Vol. 99, Iss. 1 — January 2019

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