Distributed quantum sensing using continuous-variable multipartite entanglement
Name
PhysRevA.97.032329.pdf
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369.26 KB
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Author(s)
Zhuang, Quntao
Shapiro, Jeffrey H
Zhang, Zheshen
Date Issued
March 2018
Journal
Physical Review A
Publisher
American Physical Society
Citation
Zhuang, Quntao, et al. “Distributed Quantum Sensing Using Continuous-Variable Multipartite Entanglement.” Physical Review A, vol. 97, no. 3, Mar. 2018. © 2018 American Physical Society
Version
Final published version
Abstract
Distributed quantum sensing uses quantum correlations between multiple sensors to enhance the measurement of unknown parameters beyond the limits of unentangled systems. We describe a sensing scheme that uses continuous-variable multipartite entanglement to enhance distributed sensing of field-quadrature displacement. By dividing a squeezed-vacuum state between multiple homodyne-sensor nodes using a lossless beam-splitter array, we obtain a root-mean-square (rms) estimation error that scales inversely with the number of nodes (Heisenberg scaling), whereas the rms error of a distributed sensor that does not exploit entanglement is inversely proportional to the square root of the number of nodes (standard quantum limit scaling). Our sensor's scaling advantage is destroyed by loss, but it nevertheless retains an rms-error advantage in settings in which there is moderate loss. Our distributed sensing scheme can be used to calibrate continuous-variable quantum key distribution networks, to perform multiple-sensor cold-atom temperature measurements, and to do distributed interferometric phase sensing.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.97.032329
