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The laws of physics are invariant under CPT transformations reversing time, inverting space and flipping charges. Almost so. The collapse of the wave function is the odd man out. Can the time direction of the collapse of the wave function be reversed so that the collapse happened in the past?

The collapse presupposed the Schroedinger picture. Can a collapse occur in the Heisenberg picture, with the projection operator $P$ replaced with $UPU^{1}$?

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Related: physics.stackexchange.com/q/10068/2451 –  Qmechanic Mar 23 '12 at 7:41
Doesn't seem to be an exact duplicate, but I'm not familiar with this stuff so im not sure. –  Manishearth Mar 23 '12 at 9:21

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