Violation of time reversal symmetry in quantum noninvasive measurements

Details Violation of time reversal symmetry in quantum noninvasive measurements Violation of time reversal symmetry in quantum noninvasive measurements

2011-08-05

arxiv.org/abs/1108.1305v1

Physics

Quantum Physics

4 pages, 3 figures + Supplement(3 pages, 2 figures)

Scientific paper

A quantum system in equilibrium is by definition in a state, which is invariant under time-reversal. However, in general projective quantum measurements of incompatible observables would obviously break the time-reversal symmetry, which one could try to circumvent by a weak quantum measurement leaving the state of the system intact. We show that, paradoxically, time-reversal symmetry is violated for this type of measurement, with the violation detectable in higher-order correlation functions. We propose an experiment with quantum dots to measure this apparent violation of time reversal symmetry in a third-order current correlation function.

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