Discrimination Among Quantum States |
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| Authors: | Masashi Ban |
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| Affiliation: | (1) Advanced Research Laboratory, Hitachi Ltd., Hatoyama, Saitama, 350-0395, Japan |
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| Abstract: | ![]()
It has recently been shown that quantum measurement is not always useful for discrimination among quantum states (K. Hunter (2003). Physical Review A68, 012306). This paper provides another proof of the necessary and sufficient condition for quantum measurement not to be useful and examines the condition by considering quantum measurement which discriminates between two spin-1/2 states in thermal equilibrium. |
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| Keywords: | quantum measurement state discrimination optimization of detection probability |
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