Monday, 12 October 2020

Why doesn't the quantum eraser violate the no-deletion theorem?


In the quantum eraser experiment and its variants, you basically have a double slit experiment, where you detect which slit the photon went through, but then forget this information.


My question is, why doesn't this contradict the Quantum no-deleting theorem?


Note: Okay, so have two slits and a detector. You send a photon towards the detector. The photon will go through one or the other, and you detect this. Then you delete this information. The photon creates an interference pattern. Why was the deletion possible? (The link has a more specific setup, but I want the question to be for quantum eraser experiments in general).




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