State-dependent rotations of spins by weak measurements

Details State-dependent rotations of spins by weak measurements State-dependent rotations of spins by weak measurements

2010-08-04

arxiv.org/abs/1008.0676v2

Physics

Quantum Physics

10 pages, 2 figures. Substantially revised to concentrate on weak measurement transformation of states and application to cryp

Scientific paper

IIt is shown that a weak measurement of a quantum system produces a new state of the quantum system which depends on the prior state, as well as the (uncontrollable) measured position of the pointer variable of the weak measurement apparatus. The result imposes a constraint on hidden-variable theories which assign a different state to a quantum system than standard quantum mechanics. The constraint means that a crypto-nonlocal hidden-variable theory can be ruled out in a more direct way than previously.

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