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by simonh 666 days ago
Just to try and summarise the issue. It turns out measurements of one of the entangled particles (particle A) are correlated to the settings of the measurement apparatus. For example the axis on which the polarisation of a photon is measured affects the measurement you get.

That setting is not known when the particles become entangled, and so in principle cannot affect the state of particle B. However since the setting does in fact correlate with the measured state of particle A, it also correlates with the state of particle B.