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I've read that you can't detect an interference pattern at D0 in the image below without correlating with data from D1, D2, D3, and D4 due to the coherence being broken by the BBO crystal. Does this coherence-breaking extend to the entanglement of the photons? What if you were to swap the locations of the BBO crystal and the slits, while leaving the Glan-Thompson prism where it is (after the slits?) Would the delayed choice aspect of this experiment still come into play while allowing you to see the interference pattern or lack thereof at D0?

enter image description here

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  • $\begingroup$ Consider to spell out acronyms in title. $\endgroup$ – Qmechanic Aug 12 '17 at 15:34
  • $\begingroup$ @Qmechanic Sorry, BBO = Beta-Barium-Borate, a crystal commonly used for spontaneous parametric down conversion to create entangled photon pairs. $\endgroup$ – CoryG Aug 13 '17 at 16:34

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