Why do we think that the difference in polarity of both photons should always be a right angle? Perhaps we answer that quantum theory entails this for these atoms; but the most important reason is that this difference can be measured directly. In the picture...
Quantum Entanglement
Why do we think that the difference in polarity of both photons should always be a right angle? Perhaps we answer that the quantum theory requires this for these atoms; but the most important reason is that this difference can be measured directly. In the image, successive pairs of photons pass through the filters; one of the filters passes the red light as the other passes the green light. Each of these beams is then directed in the direction of the [H/V] polarizer. Not only does the [H/V] polarizer work; if you use any other angle on both sides, you get the same result. For example, if the device is measuring [?45] the right side will detect a photon in direction ?45 whenever the left side detects direction ?45 and vice versa. These pairs of photons are called Entangled Photons.
- Alistair Ray, Quantum Physics: Fact or Fiction?, Translated by Osama Abbas, Al-Braheen Center, p.77
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