On 20/04/2016 6:56 am, smitra wrote:
The mistake made is to invoke classical reasoning after the
measurements are made. If the choice for the orientation of the
polarizers were not made in advance, then Alice and Bob cannot have
said to have made any definite choices at all.
I think you need to learn something about decoherence , and the
emergence of the 'classical' from the 'quantum'. In the final analysis,
Alice and Bob meet to compare their results. By that stage, their
results, and their relative magnet orientations, are definite and
classical (FAPP if you wish). And that is the end result we have to
explain. All else is boondoggle.
Bruce
In some particular sector where Alice made some particular result and
found some particular result, she knows that Bob's spin state. But Bob
lives in larger sector of the multiverse which includes sectors where
Alic had made different choices.
Alice and Bob communicating later is not some trivial exchange of
information that existed a priori, it leads to a further de-facto
collapse of the wavefunction.
There isn't anything more to this that Alice measuring the spin of an
electron in a lab, and then letting Bob who doesn't know what
direction the spin was measured in, doing another measurement.
Saibal
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