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Fundamental bounds on quantum measurements with a mixed apparatus

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arxiv quant-ph/0004016 v1 pith:2EUIHMEN submitted 2000-04-04 quant-ph

Fundamental bounds on quantum measurements with a mixed apparatus

classification 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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