On Fri, Jul 26, 2013 at 9:46 PM, Jason Resch <jasonre...@gmail.com> wrote:

> So why is it the entanglement is destroyed by the presence of the 45
> degree filter, but not the 0 degree filter?

Because before the photon hit the 0 degree filter, that is to say before it
was measured, neither it nor it's entangled twin had any polarization at
all. The single measurement gave both of them a value, but if you set up
the experiment again for just one photon with the filter at a different
angle you will get a different value for the polarization of that photon
and destroy the entanglement. It's very easy to destroy entanglement and
nothing does it better than measurement.

  John K Clark

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