Optimal Gaussian metrology for generic multimode interferometric circuit

Teruo Matsubara, Paolo Facchi, Vittorio Giovannetti, Kazuya Yuasa

研究成果: Article査読

7 被引用数 (Scopus)

抄録

Bounds on the ultimate precision attainable in the estimation of a parameter in Gaussian quantum metrology are obtained when the average number of bosonic probes is fixed. We identify the optimal input probe state among generic (mixed in general) Gaussian states with a fixed average number of probe photons for the estimation of a parameter contained in a generic multimode interferometric optical circuit, namely, a passive linear circuit preserving the total number of photons. The optimal Gaussian input state is essentially a single-mode squeezed vacuum, and the ultimate precision is achieved by a homodyne measurement on the single mode. We also reveal the best strategy for the estimation when we are given L identical target circuits and are allowed to apply passive linear controls in between with an arbitrary number of ancilla modes introduced.

本文言語English
論文番号033014
ジャーナルNew Journal of Physics
21
3
DOI
出版ステータスPublished - 2019 3 19

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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