Delayed-Choice Experiments and the Metaphysics of Entanglement

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Foundations of Physics, ISSN: 0015-9018, Vol: 43, Issue: 9, Page: 1124-1135

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Egg, Matthias
Springer Nature
Physics and Astronomy
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article description
Delayed-choice experiments in quantum mechanics are often taken to undermine a realistic interpretation of the quantum state. More specifically, Healey has recently argued that the phenomenon of delayed-choice entanglement swapping is incompatible with the view that entanglement is a physical relation between quantum systems. This paper argues against these claims. It first reviews two paradigmatic delayed-choice experiments and analyzes their metaphysical implications. It then applies the results of this analysis to the case of entanglement swapping, showing that such experiments pose no threat to realism about entanglement. © 2013 Springer Science+Business Media New York.