Proposed Robust Entanglement-Based Magnetic Field Sensor Beyond the Standard Quantum Limit

Tohru Tanaka, Paul Knott, Yuichiro Matsuzaki, Shane Dooley, Hiroshi Yamaguchi, William J. Munro, and Shiro Saito
Phys. Rev. Lett. 115, 170801 – Published 21 October 2015
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Abstract

Recently, there have been significant developments in entanglement-based quantum metrology. However, entanglement is fragile against experimental imperfections, and quantum sensing to beat the standard quantum limit in scaling has not yet been achieved in realistic systems. Here, we show that it is possible to overcome such restrictions so that one can sense a magnetic field with an accuracy beyond the standard quantum limit even under the effect of decoherence, by using a realistic entangled state that can be easily created even with current technology. Our scheme could pave the way for the realizations of practical entanglement-based magnetic field sensors.

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  • Received 5 December 2014

DOI:https://doi.org/10.1103/PhysRevLett.115.170801

© 2015 American Physical Society

Authors & Affiliations

Tohru Tanaka1,2, Paul Knott1, Yuichiro Matsuzaki1, Shane Dooley1,3, Hiroshi Yamaguchi1, William J. Munro1, and Shiro Saito1

  • 1NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
  • 2Department of Physics, Waseda University, Tokyo 169-8555, Japan
  • 3National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan

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Issue

Vol. 115, Iss. 17 — 23 October 2015

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