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International Journal of Quantum Information

ENTANGLEMENT SWAPPING AND QUANTUM COMMUNICATION IN CAVITY QED

Chuan-Jia Shan, Ji-Bing Liu, W. W. Cheng, Tang-Kun Liu, Yanxia Huang, HONG LI

Published Dec 1, 2008• 1 citation
Publisher

Abstract

We study entanglement swapping and quantum communication in the context of cavity QED. We first present an entanglement swapping scheme in cavities where two atoms without interacting previously can be entangled with the success probability unity. Then, conditioned on a novel property of entanglement swapping, we propose a secure direct communication protocol, in which two legitimate users can communicate deterministically.

DOI
10.1142/s0219749908004420

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We study entanglement swapping and quantum communication in the context of cavity QED. We first present an entanglement swapping scheme in cavities where two atoms without interacting previously can be entangled with the success probability unity. Then, conditioned on a novel property of entanglement swapping, we propose a secure direct communication protocol, in which two legitimate users can communicate deterministically.
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We propose an entanglement swapping scheme in cavity QED.The different degree entanglement between atoms that never directly interacted can be realized,the unknown entanglement state can be transferred on atoms that never directly interacted.In the scheme,the previously used joint measurement is not needed.Only single measurement on atom is needed in realizing the swapping process.During the interaction between atom and cavity,the cavity is only virtually excited and thus the scheme is insensitive to the cavity field states and cavity decay.
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