Quantum information processing for a coherent superposition state via a mixed entangled coherent channel

Details Quantum information processing for a coherent superposition state via a mixed entangled coherent channel Quantum information processing for a coherent superposition state via a mixed entangled coherent channel

2001-04-18

arxiv.org/abs/quant-ph/0104090v3

Phys. Rev. A 64, 052308 (2001)

Physics

Quantum Physics

7 pages, 4 figures. The content has been modified and the title has been changed. Accepted for publication in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.64.052308

An entangled two-mode coherent state is studied within the framework of $2\times 2$ 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.

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