Quantum Measurement Reliability versus Reversibility

Details Quantum Measurement Reliability versus Reversibility Quantum Measurement Reliability versus Reversibility

2009-01-07

arxiv.org/abs/0901.0951v1

Physics

Quantum Physics

18 pages, 5 figures, submitted to Am. J. Phys

Scientific paper

There is a constraining relation between the reliability of a quantum measurement and the extent to which the measurement process is, in principle, reversible. The greater the information that is gained, the less reversible the measurement dynamics become. To illustrate this relation, we develop a simple physical model for quantum measurement, as well as a hypothetical scheme by which the experimenters can determine the reliability and reversibility. We derive an "uncertainty" (constraining) relation between reliability and reversibility, which holds even when there is no interaction with any external environment other than the fundamental information recording device.

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