Classical Correlations and Entanglement in Quantum Measurements

Details Classical Correlations and Entanglement in Quantum Measurements Classical Correlations and Entanglement in Quantum Measurements

2002-07-19

arxiv.org/abs/quant-ph/0207116v2

Phys. Rev. Lett. 90 (5), 050401 (2003)

Physics

Quantum Physics

to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.90.050401

We analyze a quantum measurement where the apparatus is initially in a mixed state. We show that the amount of information gained in a measurement is not equal to the amount of entanglement between the system and the apparatus, but is instead equal to the degree of classical correlations between the two. As a consequence, we derive an uncertainty-like expression relating the information gain in the measurement and the initial mixedness of the apparatus. Final entanglement between the environment and the apparatus is also shown to be relevant for the efficiency of the measurement.

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