Complementarity and Information in "Delayed-Choice for Entanglement Swapping"

Author(s): Č. Brukner, M. Aspelmeyer, A. Zeilinger

Journal: Foundations of Physics

Volume: 35

Page(s): 1909-1919

Year: 2005

DOI Number: 10.1007/s10701-005-7355-2

Link: Link to publication

Abstract:

Building on Peres’ idea of “Delayed-choice for entanglement 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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Zeilinger Group Zeilinger Group , Brukner Group