Fundamental bounds on quantum measurements with a mixed apparatus

Details Fundamental bounds on quantum measurements with a mixed apparatus Fundamental bounds on quantum measurements with a mixed apparatus

2000-04-04

arxiv.org/abs/quant-ph/0004016v1

Physics

Quantum Physics

3 pages, 2 figures

Scientific paper

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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