Most continuous-variable quantum networks are useful for quantum metrology.

ORAL

Abstract

Distributed quantum sensing is one of the quantum metrological tasks that exploit entanglement to estimate parameters in distant nodes. Until now, it is well known that particular continuous-variable (CV) quantum networks provide enhancement for distributed sensing but it is not clear whether a general quantum network is beneficial. In this work, we investigate the quantum metrological usefulness of typical CV quantum networks. Particularly, we show that most CV quantum networks provide entanglement between modes that enables one to achieve the Heisenberg scaling of an estimation error for distributed quantum displacement sensing, which cannot be attained using product states. Further, we analytically and numerically show that local phase shift operations are essential ingredients for the task. Finally, we find a tolerant photon-loss rate that maintains the quantum enhancement for practical applications.

*H.K. and H.J. are supported by the National Research Foundation of Korea (NRF-2019M3E4A1080074, NRF-2020R1A2C1008609, NRF-2020K2A9A1A06102946) via the Institute of Applied Physics at Seoul National University and by the Ministry of Science and ICT, Korea, under the ITRC (Information Technology Research Center) support program (IITP-2021-2020-0-01606) supervised by the IITP (Institute of Information & Communications Technology Planning & Evaluation).Y.L. acknowledges National Research Foundation of Korea a grant funded by the Ministry of Science and ICT (NRF-2020M3E4A1077861) and KIAS Individual Grant(CG073301) at Korea Institute for Advanced Study.L.J. and C.O. acknowledge support from the ARO (W911NF-18-1-0020, W911NF-18-1-0212), ARO MURI (W911NF-16-1-0349), AFOSR MURI (FA9550-19-1-0399), NSF (EFMA-1640959, OMA-1936118, EEC-1941583), NTT Research, and the Packard Foundation (2013-39273).We also acknowledge the University of Chicago&rsquo

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Publication: arXiv:2107.14251 - Quantum Metrological Power of Continuous-Variable Quantum Networks

Presenters

  • Hyukgun Kwon

    • Seoul National University

Authors

  • Hyukgun Kwon

    • Seoul National University