A fundamental upper bound for signal to noise ratio of quantum detectors

Ryota Katsube, Masahiro Hotta, Koji Yamaguchi

Research output: Contribution to journalArticlepeer-review

Abstract

Quantum fluctuations yield inevitable noises in quantum detection. We derive an upper bound of signal to noise ratio for arbitrary quantum detection described by trace-class operators with discrete spectra. The bound is independent of observables to be detected and is computed by quantum fidelity of two initial quantum states. We provide applications of the upper bound.

Original languageEnglish
Article number054005
Journaljournal of the physical society of japan
Volume89
Issue number5
DOIs
Publication statusPublished - 2020 May 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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