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arXiv:quant-ph/0312100

Quantum probabilistic teleportation via entangled coherent states

Shang-Bin Li Jing-Bo Xu

Published Dec 11, 2003• 0 citations
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Abstract

We study the entanglement of entangled coherent states in vacuum environment by employing the entanglement of formation and propose a scheme to probabilistically teleport a coherent superposition state via entangled coherent states, in which the amount of classical information sent by Alice is restricted to one bit. The influence of decoherence due to photon absorpation is considered. It is shown that decoherence can improve the mean fidelity of probabilistic teleportation in some situations.

DOI
10.48550/arxiv.quant-ph/0312100

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We study an entangled two-mode coherent state within the framework of 2times22\\times 22times2 dimensional Hilbert space and suggest a scheme to teleport a coherent superposition state. When the entangled coherent state decays into the vacuum, it is found that its evolved state always remains entangled and the larger the coherent amplitude, the faster entanglement decreases. We find that the decohered entangled coherent state can be useless in quantum teleportation as it gives the optimal fidelity of teleportation less than the classical limit 2/3.
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An entangled two-mode coherent state is studied within the framework of 2\ifmmode\times\else\texttimes\fi{}2-dimensional Hilbert space. An entanglement concentration scheme based on joint Bell-state measurements is worked out. When the entangled coherent state is embedded in vacuum environment, its entanglement is degraded but not totally lost. It is found that the larger the initial coherent amplitude, the faster entanglement decreases. We investigate a scheme to teleport a coherent superposition state while considering a mixed quantum channel. We find that the decohered entangled coherent state may be useless for quantum teleportation as it gives the optimal fidelity of teleportation less than the classical limit 2/3.