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arXiv quant-ph/0110031quant-ph
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连续变量隐形传态的量子信道与量子态的非经典性

Quantum channel of continuous variable teleportation and nonclassicality of quantum states

Masahiro Takeoka, Masashi Ban, Masahide Sasaki

摘要:

利用完全正映射和Glauber-Sudarshan $P$函数研究了双模压缩真空态中非经典量子态的噪声隐形传态.使用非经典深度作为传输性能的衡量标准,我们比较了隐形传态方案通过噪声信道的直接传输。噪声模型基于与真空场的耦合。结果表明,在一定范围内,隐形传态信道比直接传输信道具有更好的传输性能。并讨论了该区域的边界以及实现非经典隐形传态量子态的边界。我们的模型与Furusawa等人[Science { \bf 282},706(1998)]实验中观察到的隐形传态保真度相当吻合。最后,我们提到在实际实验中传输非经典特征所需的条件。

英文摘要:

Noisy teleportation of nonclassical quantum states via a two-mode squeezed-vacuum state is studied with the completely positive map and the Glauber-Sudarshan $P$-function. Using the nonclassical depth as a measure of transmission performance, we compare the teleportation scheme with the direct transmission through a noisy channel. The noise model is based on the coupling to the vacuum field. It is shown that the teleportation channel has better transmission performance than the direct transmission channel in a certain region. The bounds for such region and for obtaining the nonvanished nonclassicality of the teleported quantum states are also discussed. Our model shows a reasonable agreement with the observed teleportation fidelity in the experiment by Furusawa et al. [Science {\bf 282}, 706 (1998)]. We finally mention the required conditions for transmitting nonclassical features in real experiments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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