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arXiv quant-ph/0011069quant-ph
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与环境局部相互作用的量子信道

Quantum channel locally interacting with environment

Satoshi Ishizaka

摘要:

研究了与二能级环境局域相互作用的量子信道。两级环境被视为一个量子比特(qubit)以及Alice和Bob拥有的一对粒子。最初由Alice和Bob共享的纠缠量由于相互作用而分布在这三个量子比特之间。在这个模型中,我们证明了退相干量子信道的单重态分数是由分布纠缠唯一决定的。当在标准隐形传态方案下使用消相干量子信道时,通过考虑环境与传输态之间的剩余纠缠,可以很好地理解最佳隐形传态保真度。

英文摘要:

The quantum channel subject to local interaction with two-level environment is studied. The two-level environment is regarded as a quantum bit (qubit) as well as a pair of particles owned by Alice and Bob. The amount of entanglement initially shared by Alice and Bob is distributed among these three qubits due to the interaction. In this model, we show that the singlet fraction of the decohered quantum channel is uniquely determined by the distributed entanglement. When the decohered quantum channel is used under the standard teleportation scheme, the optimal teleportation fidelity is well understood by considering the remaining entanglement between environment and transmitted state.

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