Details

Autor(en) / Beteiligte

• Kwon, Hyukjoon
• Tan, Kok Chuan
• Volkoff, Tyler
• Jeong, Hyunseok

Titel

Nonclassicality as a Quantifiable Resource for Quantum Metrology

Ist Teil von

• Physical review letters, 2019-02, Vol.122 (4), p.040503-040503, Article 040503

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2019

Link zum Volltext

Quelle

American Physical Society [PROLA]

Beschreibungen/Notizen

• 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.