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The Quantum Eraser Paradox

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arxiv 2111.09347 v2 pith:UYAOX6V7 submitted 2021-11-17 quant-ph physics.hist-ph

classification quant-phphysics.hist-ph
keywords quantumexperimentparadoxchoiceeraserinfluenceinterpretedmechanics
verification ladder T0 review T1 audit T2 compute T3 formal
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The Delayed-Choice Quantum Eraser experiment is commonly interpreted as implying that in quantum mechanics a choice made at one time can influence an earlier event. We here suggest an extension of the experiment that results in a paradox when interpreted using a local realist interpretation combined with backward causation ("retrocausality"). We argue that resolving the paradox requires giving up the idea that, in quantum mechanics, a choice can influence the past, and that it instead requires a violation of Statistical Independence without retrocausality. We speculate what the outcome of the experiment would be.

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