Foundations of Physics

, Volume 35, Issue 11, pp 1909–1919 | Cite as

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

  • Časlav BruknerEmail author
  • Markus Aspelmeyer
  • Anton Zeilinger


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.


quantum mechanics entanglement quantum information 


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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • Časlav Brukner
    • 1
    • 2
    • 3
    Email author
  • Markus Aspelmeyer
    • 1
    • 2
  • Anton Zeilinger
    • 1
    • 2
  1. 1.Institut für ExperimentalphysikUniversität WienWienAustria
  2. 2.Institut für Quantenoptik und QuanteninformationÖsterreichische Akademie der WissenschaftenWienAustria
  3. 3.Optics Section, The Blackett Laboratory, Imperial CollegeLondonUK

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