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I'm deeply interested in understanding delayed choice eraser experiment. Although I understand the experimental results, the retro causality is causing a big headache.

From what I understand, the hidden variables theory is a no - no, due to experimental verification of the Bells inequality...

A recent PDF that I came across confused me, hence this question...

The PDF claims that the superposed eigenstates will continue to evolve, if not interrupted by a detector.

My question is: Can it be established that it continues to evolve despite not being measured? Doesn't that violate the Copehagen interpretation -or- is it an understanding that is implicit to the quantum processes itself? Or am I making a noob mistake?

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BTW, any resources suggested for a simple + great explanation regarding this topic would be greatly appreciated. – Vignesh Aug 3 '13 at 9:08
Are you sure it said that the eigenstates/observables continued to evolve, or the wavefunction? (The pdf doesn't load for me, so I can't check . ) – centralcharge Aug 4 '13 at 8:11

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