期刊
PHYSICAL REVIEW LETTERS
卷 122, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.040503
关键词
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资金
- National Research Foundation of Korea - Korea government [2010-0018295]
- Korea Research Fellowship Program through the National Research Foundation of Korea (NRF) - Ministry of Science and Information and Communications Technology [2016H1D3A1938100, 2016H1D3A1908876]
- National Research Foundation of Korea [2016H1D3A1908876] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We establish the nonclassicality of continuous-variable states as a resource for quantum metrology. Based on the quantum Fisher information of multimode quadratures, we introduce the metrological power as a measure of nonclassicality with a concrete operational meaning of displacement sensitivity beyond the classical limit. This measure belongs to the resource theory of nonclassicality, which is nonincreasing under linear optical elements. Our Letter reveals that a single copy, highly nonclassical quantum state is intrinsically advantageous when compared to multiple copies of a quantum state with moderate nonclassicality. This suggests that metrological power is related to the degree of quantum macroscopicity. Finally, we demonstrate that metrological resources useful for nonclassical displacement sensing tasks can be always converted into a useful resource state for phase sensitivity beyond the classical limit.
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