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arXiv:quant-ph/0405036 · Foundations of Physics

Complementarity and Information in “Delayed-choice for Entanglement Swapping”

Časlav Brukner, Markus Aspelmeyer, Anton Zeilinger

Published Nov 1, 2005• 22 citations
arXivHTMLPDF
DOI
10.1007/s10701-005-7355-2

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Building on Peres's idea of "Delayed-choice for extanglement swapping" we show that even the degree to which quantum systems were entangled can be defined after they have been registered and may even not exist any more. This does not arise as a paradox if the quantum state is viewed as just a representative of information. Moreover such a view gives a natural quantification of the complementarity between the measure of information about the input state for teleportation and the amount of entanglement of the resulting swapped entangled state.

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8 Delayed-Choice Experiments and the Metaphysics of Entanglement

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.

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Delayed-Choice Experiments and the Metaphysics of Entanglement

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Building on Peres's idea of "Delayed-choice for extanglement swapping" we show that even the degree to which quantum systems were entangled can be defined after they have been registered and may even not exist any more. This does not arise as a paradox if the quantum state is viewed as just a representative of information. Moreover such a view gives a natural quantification of the complementarity between the measure of information about the input state for teleportation and the amount of entanglement of the resulting swapped entangled state.
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.