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arXiv quant-ph/0401061quant-ph
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复杂量子系统中的阻挫、相互作用强度和基态纠缠

Frustration, interaction strength and ground-state entanglement in complex quantum systems

Christopher M. Dawson, Michael A. Nielsen

摘要:

多体量子系统的基态中,当系统哈密顿量中的局域项与相互作用项不能对易时,会产生纠缠。我们量化了这种现象,证明了基态纠缠和自旋系统中的挫折现象之间的类比。特别是,我们证明了基态纠缠的量是有界以上的相互作用挫败的局部项的哈密顿量的程度的措施。作为一个推论,我们表明,基态纠缠的量是有界的参数之间的比率表征在系统中的相互作用的强度,和本地的能量标度。最后,我们证明了一个定性类似的结果,系统的其他能量本征态。

英文摘要:

Entanglement in the ground state of a many-body quantum system may arise when the local terms in the system Hamiltonian fail to commute with the interaction terms in the Hamiltonian. We quantify this phenomenon, demonstrating an analogy between ground-state entanglement and the phenomenon of frustration in spin systems. In particular, we prove that the amount of ground-state entanglement is bounded above by a measure of the extent to which interactions frustrate the local terms in the Hamiltonian. As a corollary, we show that the amount of ground-state entanglement is bounded above by a ratio between parameters characterizing the strength of interactions in the system, and the local energy scale. Finally, we prove a qualitatively similar result for other energy eigenstates of the 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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