Quantum versus classical domains for teleportation with continuous variables
Quantum versus classical domains for teleportation with continuous variables
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DOI：
10.1103/physreva.64.022321
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发表时间：
2001-08-01
影响因子：
2.9
通讯作者：
van Loock, P
中科院分区：
文献类型：
--
作者：
Braunstein, SL;Fuchs, CA;van Loock, P
通过考虑没有量子纠缠的经典通道的利用，在电磁场的相干状态中，已经确定了富达f-classical = 1/2，以设置经典和量子域之间的边界[S. S. L. Braunstein，C。A。Fuchs和H. J. Kimble，J。Mod。选择。 47，267（2000）]。我们通过调查爱因斯坦 - 波多尔斯基 - 罗森特州的纠缠和贝尔 - 质量违规问题，进一步研究量子古典边界，与连续可变的传送有关。再次发现使用纠缠作为量子资源的阈值保真度再次被发现是F-Classical = 1/2。同样，违反当地现实主义在相同的阈值下开始的情况，在无条件案例中增加了总体效率ETA> 2/3的要求。相比之下，最近提出的标准是根据量子 - 非安置检测的文献所改编的，这在很大程度上与纠缠和违反贝尔症的问题无关。
By considering the utilization of a classical channel without quantum entanglement, fidelity F-classical=1/2 has been established as setting the boundary between classical and quantum domains in the teleportation of coherent states of the electromagnetic field [S. L. Braunstein, C. A. Fuchs, and H. J. Kimble, J. Mod. Opt. 47, 267 (2000)]. We further examine the quantum-classical boundary by investigating questions of entanglement and Bell-inequality violations for the Einstein-Podolsky-Rosen states relevant to continuous variable teleportation. The threshold fidelity for employing entanglement as a quantum resource in teleportation of coherent states is again found to be F-classical=1/2. Likewise, violations of local realism onset at this same threshold, with the added requirement of overall efficiency eta >2/3 in the unconditional case. By contrast, recently proposed criteria adapted from the literature on quantum-nondemolition detection are shown to be largely unrelated to the questions of entanglement and Bell-inequality violations.