Two photons are moving in opposite directions along the y-axis are in the entangled polarization state(adsbygoogle = window.adsbygoogle || []).push({});

|Ψ> = (1/√2)(|VV>+|HH>)

V is vertical polarization relative to the z axis and measured from an axis n_{1}and is defined as θ=θ_{1}and H is horizontal polarization to the z axis measured from an axis n_{2}and is defined as θ=θ_{2}.

Would P_{VV}+P_{HH}+P_{VH}+P_{HV}=1

If P_{VV}is the probability that photon 1 givees vertical polarization relative to an axis n_{1}and photon 2 gives vertical polarization relative to an axis n_{2}

Am I correct in saying this as there is no way to predict the outcome of a spin measurement and so those probabilities must add to one as they are all the options available and the choice of axis does not matter??

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# B Polarization and probability

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