Does a measurement really collapse the wave function?

Details Does a measurement really collapse the wave function? Does a measurement really collapse the wave function?

2010-02-22

arxiv.org/abs/1002.4219v4

Physics

Quantum Physics

5 pages, 2 figures The explanation was strongly modified for more clarity

Scientific paper

A single-particle multi-branched wave-function is studied. Usual which-path tests show that if the detector placed on one branch clicks, the detectors on the other branches remain silent. By the collapse postulate, after this click, the state of the particle is reduced to a single branch, the branch on which the detector clicked. The present article challenges the collapse postulate, claiming that when one branch of the wave-function produces a click in a detector, the other branches don't disappear. They can't produce clicks in detectors, but they are still there. An experiment different from which-path test is proposed, which shows that detectors are responsible for strongly decohering the wave-function, but not for making parts of it disappear. Moreover, one of the branches supposed to disappear may produce an interference pattern with a wave-packet of another particle.

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