This video gives a detailed explanation of how to correctly interpret the delayed-choice quantum eraser. This is followed by a full derivation of the equations that describe the problem. If you find these steps a bit rushed, I suggest pausing the video after each step.
*CORRECTION*: around 15:16, there is a small typo in the expression under “Replacing wavefunction past BS”. The term |ψ⟩ᵇᵢ at the end of the equation should not be present.
The derivation uses a combination of the following sources:
https://arxiv.org/abs/1707.07884
https://arxiv.org/abs/1908.03920
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