Fundamental bounds on quantum measurements with a mixed apparatus
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🪐 quant-ph
keywords
apparatusmixedboundsfundamentalmeasurementquantumboundconsider
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We consider the apparatus in a quantum measurement process to be in a mixed state. We propose a simple upper bound on the probability of correctly distinguishing any number of mixed states. We use this to derive fundamental bounds on the efficiency of a measurement in terms of the temperature of the apparatus.
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