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marksesl
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I've been studying the Bell-state Quantum Eraser from every source I can find, including the Walborn paper. I get contradictory information concerning what happens in the Dp arm where a polarizing filter is placed before the detector to lose which-way information and regain the interference pattern. In one source it explains that the polarizer is a diagonal polarizer and that it polarizes the Dp photon to a diagonal orientation causing its entangled partner photon, the one going towards the double slits and Ds, to become diagonal too. So, then the diagonally polarized Ds photons will go through the twin quarter-wave polarizers before the double slits giving ambiguous results, causing either right-hand or left-hand polarization from the same filter, thus destroying which-way information. On the other hand, the Walborn paper states: "[recovering the interference pattern] can be done by placing a polarizer in the path of beam p and orientating it at +45 degrees to select |+>p or at - 45 degrees to select |->p. The interference pattern is recovered through the coincidence detection of photons s and p. I have no idea what he is talking about. Can someone explain this part of the Bell-state quantum eraser in clear and simple terms? Thanks