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Let us assume that the lecturer is correct. My analysis would be as follows: Consider an initial state $$|1 \rangle = \frac{1}{\sqrt{2}} (|S_z + \rangle + |S_z -\rangle). $$ Now it passes through the first SG experiment, and all down spins are filtered out, so you have a collapsed state $$|2 \rangle = |S_z + \rangle = \frac{1}{\sqrt{2}} (|S_x + \rangle + |...


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If the polarisation states are orthogonal, the two slits will not interact with each other. Simply calculate the one-slit patterns from the two sources. Remember that the phase of the (presumably coherent) light and the polarisation have nothing whatsoever to do with each other -- Temporally coherent classical light in a polarisation-independent medium can ...


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