Logical Pre- and Post-Selection paradoxes, measurement-disturbance and contextuality

Details Logical Pre- and Post-Selection paradoxes, measurement-disturbance and contextuality Logical Pre- and Post-Selection paradoxes, measurement-disturbance and contextuality

2004-12-23

arxiv.org/abs/quant-ph/0412179v1

Proceedings of QS 2004, Int. J. Theor. Phys. 44:1977-1987 (2005)

Physics

Quantum Physics

9 pages, paper presented at Quantum Structures 2004

Scientific paper

10.1007/s10773-005-8975-1

Many seemingly paradoxical effects are known in the predictions for outcomes of measurements made on pre- and post-selected quantum systems. A class of such effects, which we call ``logical pre- and post-selection paradoxes'', bear a striking resemblance to proofs of the Bell-Kochen-Specker theorem, which suggests that they demonstrate the contextuality of quantum mechanics. Despite the apparent similarity, we show that such effects can occur in noncontextual hidden variable theories, provided measurements are allowed to disturb the values of the hidden variables.

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