Distributed quantum sensing of multiple phases with fewer photons

Authors
Dong-Hyun KimSeongjin HongYong-Su KimYosep KimSeung-Woo LeeRaphael C. PooserKyunghwan OhSu-Yong LeeChanghyoup LeeLim, Hyang-Tag
Issue Date
2024-01
Publisher
Nature Publishing Group
Citation
Nature Communications, v.15, no.1
Abstract
Distributed quantum metrology has drawn intense interest as it outperforms the optimal classical counterparts in estimating multiple distributed parameters. However, most schemes so far have required entangled resources consisting of photon numbers equal to or more than the parameter numbers, which is a fairly demanding requirement as the number of nodes increases. Here, we present a distributed quantum sensing scenario in which quantum-enhanced sensitivity can be achieved with fewer photons than the number of parameters. As an experimental demonstration, using a two-photon entangled state, we estimate four phases distributed 3?km away from the central node, resulting in a 2.2?dB sensitivity enhancement from the standard quantum limit. Our results show that the Heisenberg scaling can be achieved even when using fewer photons than the number of parameters. We believe our scheme will open a pathway to perform large-scale distributed quantum sensing with currently available entangled sources.
URI
https://pubs.kist.re.kr/handle/201004/148444
DOI
10.1038/s41467-023-44204-z
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KIST Article > 2024
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