@article{dd7e5e446b28459b848da2dedc64e944,
title = "A fundamental upper bound for signal to noise ratio of quantum detectors",
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.",
author = "Ryota Katsube and Masahiro Hotta and Koji Yamaguchi",
note = "Funding Information: We would like to thank H. Tajima, K. Saito, K. Matsumoto, A. Kempf, and E. Martin-Martinez for valuable discussion and information. This research is partially supported by JSPS KAKENHI Grant Number JP19K03838 (M.H.) and JP18J20057 (K.Y.), and by Graduate Program on Physics for the Universe (GP-PU), Tohoku University (K.Y.), and by the WISE Program for AI Electronics, Tohoku University (R.K.). Publisher Copyright: {\textcopyright} 2020 The Physical Society of Japan.",
year = "2020",
month = may,
day = "15",
doi = "10.7566/JPSJ.89.054005",
language = "English",
volume = "89",
journal = "Journal of the Physical Society of Japan",
issn = "0031-9015",
publisher = "The Physical Society of Japan",
number = "5",
}