Neutron optical test of completeness of quantum root-mean-square errors

Sponar, Stephan; Danner, Armin; Ozawa, Masanao; Hasegawa, Yuji

Neutron optical test of completeness of quantum root-mean-square errors

Sponar, Stephan; Danner, Armin; Ozawa, Masanao et al.

npj Quantum Information, 2021, 7(1), 106

Permalink : https://hdl.handle.net/2115/82364

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アクセス権	open access
URI	https://hdl.handle.net/2115/82364
タイトル	Neutron optical test of completeness of quantum root-mean-square errors
著者	Sponar, Stephan ; Danner, Armin ; Ozawa, Masanao ; Hasegawa, Yuji
著者名 Sponar, Stephan
著者名 Danner, Armin
著者名 Ozawa, Masanao
著者名 Hasegawa, Yuji
言語	英語
発行日	2021-06-28
出版者	Nature Research
収録物名	npj Quantum Information
巻(号)	7(1)
ページ	106
抄録	While in classical mechanics the mean error of a measurement is solely caused by the measuring process (or device), in quantum mechanics the operator-based nature of quantum measurements has to be considered in the error measure as well. One of the major problems in quantum physics has been to generalize the classical root-mean-square error to quantum measurements to obtain an error measure satisfying both soundness (to vanish for any accurate measurements) and completeness (to vanish only for accurate measurements). A noise-operator-based error measure has been commonly used for this purpose, but it has turned out incomplete. Recently, Ozawa proposed an improved definition for a noise-operator-based error measure to be both sound and complete. Here, we present a neutron optical demonstration for the completeness of the improved error measure for both projective (or sharp) as well as generalized (or unsharp) measurements.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1038/s41534-021-00437-8