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arXiv 1902.05486quant-phcond-mat.stat-mech
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孤立量子系统平衡时标的经典Lieb-Robinson界估计

Classical Lieb-Robinson Bound for Estimating Equilibration Timescales of Isolated Quantum Systems

Daniel Nickelsen, Michael Kastner

摘要:

我们研究了孤立量子系统的平衡,通过将它映射到希尔伯特空间中的经典振子网络。通过为这种映射选择合适的基,量子系统的局域性程度反映在网络的稀疏性上。我们推导出了经典网络中传播速度的Lieb-Robinson界,这使我们能够估计量子系统平衡的时间尺度。界限包含一个参数,量化的程度的局部性的哈密顿量和观察。局部性在早期的平衡时间研究中被忽视,并且被认为是与大多数物理现实模型接触的关键因素。哈密顿量和可观测量越局部化,由该界预测的平衡时标就越长。

英文摘要:

We study equilibration of an isolated quantum system by mapping it onto a network of classical oscillators in Hilbert space. By choosing a suitable basis for this mapping, the degree of locality of the quantum system reflects in the sparseness of the network. We derive a Lieb-Robinson bound on the speed of propagation across the classical network, which allows us to estimate the timescale at which the quantum system equilibrates. The bound contains a parameter that quantifies the degree of locality of the Hamiltonian and the observable. Locality was disregarded in earlier studies of equilibration times, and is believed to be a key ingredient for making contact with the majority of physically realistic models. The more local the Hamiltonian and observables, the longer the equilibration timescale predicted by the bound.

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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