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Communications in Theoretical Physics

Quantum Teleportation and Superdense Coding via W-Class States

Wu Huaizhi, Zhen‐Biao Yang, Zheng Shi-Biao

Published Apr 1, 2008• 7 citations
Publisher

Abstract

According to the protocol of Agrawal et al. , we propose a cavity QED scheme for realization of teleportation and dense coding. Instead of using EPR states and GHZ states, our scheme is more insensitive to the loss of one particle by using a W-class state as a quantum channel. Besides, our scheme is immune to thermal field, and does not require the cavity to remain in the vacuum state throughout the procedure.

DOI
10.1088/0253-6102/49/4/20

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According to the protocol of Agrawal et al. , we propose a cavity QED scheme for realization of teleportation and dense coding. Instead of using EPR states and GHZ states, our scheme is more insensitive to the loss of one particle by using a W-class state as a quantum channel. Besides, our scheme is immune to thermal field, and does not require the cavity to remain in the vacuum state throughout the procedure.
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A set of protocols for teleportation and dense coding schemes based on a multiparticle quantum channel, represented by the NNN-particle entangled states of the GHZ class, is introduced. Using a found representation for the GHZ states, it was shown that for dense coding schemes enhancement of the classical capacity of the channel due from entanglement is N/N−1N/N-1N/N−1. Within the context of our schemes it becomes clear that there is no one-to one correspondence between teleportation and dense coding schemes in comparison when the EPR channel is exploited. A set of schemes, for which two additional operations as entanglement and disentanglement are permitted, is considered.