Order Symmetry of Weak Measurements

Details Order Symmetry of Weak Measurements Order Symmetry of Weak Measurements

2009-07-30

arxiv.org/abs/0907.5437v1

Physics

Quantum Physics

Scientific paper

Weak values are usually associated with weak measurements of an observable on a pre- and post-selected ensemble. We show that more generally, weak values are proportional to the correlation between two pointers in a successive measurement. We show that this generalized concept of weak measurements displays a symmetry under reversal of measurement order. We show that the conditions for order symmetry are the same as in classical mechanics. We also find that the imaginary part of the weak value has a counterpart in classical mechanics. This scheme suggests new experimental possibilities.

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