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arXiv quant-ph/0306137quant-ph
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纠缠和Bell不等式破坏的探测

Detection of entanglement and Bell's inequality violation

Kai Chen, Ling-An Wu

摘要:

提出了一种新的检测两量子比特纠缠的方法,并讨论了它与Clauser-Horne-Shimony-Holt(CHSH)贝尔不等式的关系.在不需要对密度矩阵进行全量子层析成像的情况下,我们可以通过测量任何给定状态的少于9个局部可观测量来实验检测纠缠。我们证明了这个检验比CHSH-贝尔不等式更强,并给出了纠缠度的估计。如果先验知识是可用的,我们可以进一步大大减少所需的本地可观的数量。在现有的实验技术条件下,该方法简便可行.

英文摘要:

We propose a new method for detecting entanglement of two qubits and discuss its relation with the Clauser-Horne-Shimony-Holt (CHSH) Bell inequality. Without the need for full quantum tomography for the density matrix we can experimentally detect the entanglement by measuring less than 9 local observables for any given state. We show that this test is stronger than the CHSH-Bell inequality and also gives an estimation for the degree of entanglement. If prior knowledge is available we can further greatly reduce the number of required local observables. The test is convenient and feasible with present experimental technology.

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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