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arXiv 1102.4320quant-ph
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检测真三重纠缠的多集Bell型不等式

Multisetting Bell-type inequalities for detecting genuine tripartite entanglement

Karoly F. Pal, Tamas Vertesi

摘要:

在最近的一篇论文中,Bancal等人提出了真实多体纠缠的设备无关见证者的概念。这些见证者能够验证在实验室中产生的真正的多体纠缠,而无需求助于任何关于状态空间的维度或测量算子的特定形式的知识。作为一个副产品,他们发现了一个三方三设置贝尔不等式,该不等式能够以设备无关的方式在噪声3量子比特Greenberger-Horne-Zeilinger(GHZ)状态中检测到真正的三方纠缠,其活力低至2/3。在本文中,我们将这个不等式推广到任意数量的设置,证明了阈值可见性为2/pi~0.6366的设置数量无穷大。我们还提出了一个伪心灵感应贝尔不等式达到相同的阈值。我们认为,我们的设备独立的证人是最佳的意义上,上述值不能被击败的三方相关贝尔不等式。

英文摘要:

In a recent paper, Bancal et al. put forward the concept of device-independent witnesses of genuine multipartite entanglement. These witnesses are capable of verifying genuine multipartite entanglement produced in a lab without resorting to any knowledge of the dimension of the state space or of the specific form of the measurement operators. As a by-product they found a three-party three-setting Bell inequality which enables to detect genuine tripartite entanglement in a noisy 3-qubit Greenberger-Horne-Zeilinger (GHZ) state for visibilities as low as 2/3 in a device-independent way. In this paper, we generalize this inequality to an arbitrary number of settings, demonstrating a threshold visibility of 2/pi~0.6366 for number of settings going to infinity. We also present a pseudo-telepathy Bell inequality achieving the same threshold value. We argue that our device-independent witnesses are optimal in the sense that the above value cannot be beaten with three-party-correlation Bell inequalities.

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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