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Paper Abstract and Keywords
Presentation 2015-11-24 17:20
What does a quantum measurement measure about an observable?
Masanao Ozawa (Nagoya Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) In quantum mechanics, by a measurement of a physical quantity we obtain, as a result of measurement, one of eigenvalues of the measured observable, but we cannot certainly predict which eigenvalue will be obtained. Then, is the eigenvalue obtained by a measurement possessed by the measured quantity? The current majority view considers negatively. Historically speaking such a view was accepted by pioneers of quantum mechanics, but after the Kochen-Specker theorem was found this theorem has prevailed with overextended interpretations prohibiting speaking of the value of observable even with any restriction. In this talk, after having arranged the point at issue we attempt to mathematically characterize the set of measurements that accepts the interpretation that the obtained eigenvalue is the one possessed by that observable. Then, we show that the mean-square error based on the error operator always takes the value 0 for such measurements to reveal the prevailing misconception about the error-operator based definition for a quantum mean-square error.
Keyword (in Japanese) (See Japanese page) 
(in English) quantum measurement / Kochen-Specker theorem / von Neumann measurement / quantum perfect correlation / simultaneous measurement / error / /  
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Conference Information
Committee QIT  
Conference Date 2015-11-24 - 2015-11-25 
Place (in Japanese) (See Japanese page) 
Place (in English) NTT Atsugi R&D center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Quantum Information 
Paper Information
Registration To QIT 
Conference Code 2015-11-QIT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) What does a quantum measurement measure about an observable? 
Sub Title (in English)  
Keyword(1) quantum measurement  
Keyword(2) Kochen-Specker theorem  
Keyword(3) von Neumann measurement  
Keyword(4) quantum perfect correlation  
Keyword(5) simultaneous measurement  
Keyword(6) error  
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1st Author's Name Masanao Ozawa  
1st Author's Affiliation Nagoya University (Nagoya Univ.)
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Speaker Author-1 
Date Time 2015-11-24 17:20:00 
Presentation Time 20 minutes 
Registration for QIT 
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