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Jul 02

See the paper I just uploaded to the Library Physics Section 2 July 2011.


Nick, I have assumed both laser beams have identical polarization.

|z1)|z'2') + |z2)|z'1')

If they mix orthogonal polarizations +, - then of course my idea will not work trivially. I have only been considering back-to-back momenta - ignoring the polarizations.

For example, |z1+)|z'2'-) + |z2+)|z'1'-)  + |z1-)|z'2+') + |z2-)|z'1'+) might not work?

I am too lazy to do the algebra right now.

The point is that if (+|-) = 0 makes all the cross terms on the untraced half of the pair vanish then there is no nonlocal entanglement signal.

Only if there is a local interference pattern at the receiver without the coincidence circuit do we have a nonlocal signal. We can wash out the local fringes with the Heisenberg microscope on the traced transmitter end introducing a set of random phases independent of the orthogonality or non-orthogonality of the subsystem states.