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arXiv quant-ph/0510154quant-phcond-mat.other
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平衡态纠缠的非线性响应和可观测特征

Nonlinear response and observable signatures of equilibrium entanglement

A. M. Zagoskin, A. Yu. Smirnov, S. K. Gupta, I. S. Slobodov

摘要:

我们研究了平衡纠缠如何在$N$ -量子比特系统的非线性响应中表现出来。在热力学极限下,$n$阶非线性极化率的不可约部分表明系统的本征态包含纠缠的$(n+1)$ -量子比特团簇.这为直接可观察的多量子比特纠缠签名开辟了道路。我们证明了一个四量子比特系统的静态立方磁化率的不可约部分,作为外部参数的函数,表现为一个整体的4量子比特纠缠度量在参考文献\cite{Love}中介绍。讨论了在多量子比特系统中从一般多点纠缠器中提取纯纠缠产生贡献的可能性。

英文摘要:

We investigate how equilibrium entanglement is manifested in the nonlinear response of an $N$-qubit system. We show that in the thermodynamic limit the irreducible part of the $n$th-order nonlinear susceptibility indicates that the eigenstates of the system contain entangled $(n+1)$-qubit clusters. This opens the way to a directly observable multiqubit entanglement signature. We show that the irreducible part of the static cubic susceptibility of a system of four flux qubits, as a function of external parameters, behaves as a global 4-qubit entanglement measure introduced in Ref.\cite{Love}. We discuss the possibility of extracting purely-entanglement-generated contribution from the general multipoint correlators in a multiqubit system.

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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