Journal
INTERNATIONAL JOURNAL OF QUANTUM INFORMATION
Volume 3, Issue 1, Pages 73-79Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0219749905000505
Keywords
quantum information; quantum state teleportation; entanglement; entanglement swapping; qubit; photon; quantum optics
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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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