Physics

Distributed quantum sensing of multiple phases with fewer photons

D. Kim, S. Hong, et al.

This groundbreaking research conducted by Dong-Hyun Kim, Seongjin Hong, Yong-Su Kim, Yosep Kim, Seung-Woo Lee, Raphael C. Pooser, Kyunghwan Oh, Su-Yong Lee, Changhyoup Lee, and Hyang-Tag Lim presents a revolutionary distributed quantum sensing protocol that utilizes fewer photons than parameters, achieving an impressive 2.2 dB sensitivity enhancement over traditional methods. Discover a new pathway for large-scale distributed quantum sensing with readily available entangled sources!

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Abstract

Distributed quantum metrology aims to surpass classical methods in estimating multiple distributed parameters. However, existing schemes often require entangled resources with photon numbers exceeding or equaling the parameter count. This paper presents a distributed quantum sensing protocol achieving quantum-enhanced sensitivity using fewer photons than parameters. A two-photon entangled state is used to experimentally estimate four phases distributed 3 km from a central node, demonstrating a 2.2 dB sensitivity enhancement over the standard quantum limit. This work suggests a pathway for large-scale distributed quantum sensing using currently available entangled sources.

Publisher

Nature Communications

Published On

Jan 11, 2024

Authors

Dong-Hyun Kim, Seongjin Hong, Yong-Su Kim, Yosep Kim, Seung-Woo Lee, Raphael C. Pooser, Kyunghwan Oh, Su-Yong Lee, Changhyoup Lee, Hyang-Tag Lim