Experimental Proposal of Switched "Delayed-Choice" for Entanglement Swapping

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

Journal: International Journal of Quantum Information

Volume: 3

Page(s): 73-79

Year: 2005

DOI Number: 10.1142/S0219749905000505

Link: Link to publication


Entanglement swapping is a fascinating generalization of quantum teleportation, where the entanglement between pairs is interchanged leading to entanglement between particles that never interacted. Extending the idea of Peres, we propose an experimental setup where the choice which quantum systems are finally entangled is made at a time after they have been registered and do not even exist anymore. Our proposed setup can be used in Third-Man Quantum Cryptography where a third party can control whether Alice and Bob are able to communicate secretly, but he does know their secret key.

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Aspelmeyer Group Aspelmeyer Group , Zeilinger Group , Brukner Group