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Part of entanglement is that before you measure the photons, they can be written as having a probability of existing in two or more polarization states at once.
You appear to be missing the point. Entanglement involves TWO particles with related properties not just the properties of a single particle being indeterminate until measured.
Also, suppose I simultaneously sent you two photons polarised orthogonally by using two polarisers. These are produced independently so they are not entangled, but how can you tell that they are not entangled? How would their behaviour differ from an entangled pair?
Quote from: Soul Surfer on 03/11/2010 23:34:21You appear to be missing the point. Entanglement involves TWO particles with related properties not just the properties of a single particle being indeterminate until measured. The point I am trying to make is that I can create a photon with a well defined state by passing it through a polariser, so if I create a pair of entangled photons why can't they have equally well defined states? If a polariser gives photons a specific polarisation angle, then why doesn't a parametric down converter?
As for the physical difference between them, when you measure a bunch of these states, there are statistics from the entangled state--correlations between the two photons--which you can't get with pairs of polarizers.
If you set up your experiment so that your polarizers are oriented at 45 degrees to your polarization direction, you'll see 25% two-hit detections, 50% 1-hit detection and 25% 0-hit detections for the unentangled photons, while you'll see 50% 2-hit detections and 50% no-hit detections for the entangled photon case.
Quantum theory, unlike quantum mechanics, is still only theory. My personal bias is that pikaia's statement that photons with properties are generated in the initial event is, although contrary to mainstream physics, correct.
Everything in science is "only a theory."
What I assert (loudly) that IT'S ONLY A THEORY. 
You're louder. Therefore I rescind my theory about theories being just theories. QED.
Quantum Mechanics consist of proven formulas that can be applied to accurately describe radiation, energy states, subatomic orbits, etc. Quantum Theory consist of theoretical extrapolations as to the ultimate nature of these phenomena.
In quantum theory the second interaction that brings the symmetries into realization collapses the quantum field and ends the entanglement. There is therefore no experimental difference between mirror image particles or photons arising from the collapse of entangled probabilities that are no longer entangled and the classical generation of initial mirror image particles that are un-entangled.
It must be correct as there hasn't been any correction to my discription.
Is there a PhD in the house?