arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1902.01442quant-phcond-mat.mes-hallcond-mat.stat-mechmath-phmath.MP
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随机Lindblad动力学

Random Lindblad Dynamics

Tankut Can

摘要:

利用耗散演化的动力学映射或传播子,研究了无对称性的随机Lindblad生成元的混合行为。特别是,我们确定了一个耗散的形状因子,这是传播的痕迹的长时间的行为,并使用此作为诊断的存在或不存在的光谱间隙的分布特征值的Lindblad发电机。我们发现,简单的发电机与一个单一的跳跃运营商是缓慢的混合,并放宽代数的时间,由于关闭的光谱差距的热力学极限。引入额外的跳跃算子或哈密顿量打开了在热力学极限中保持有限的光谱间隙,导致指数弛豫,从而快速混合。我们使用矩量法并引入一种新的图解展开来精确地确定Hilbert空间维数$N$中的前导阶的形状因子。我们还提出了我们的主要结果的数值支持。

英文摘要:

We study the mixing behavior of random Lindblad generators with no symmetries, using the dynamical map or propagator of the dissipative evolution. In particular, we determine the long-time behavior of a dissipative form factor, which is the trace of the propagator, and use this as a diagnostic for the existence or absence of a spectral gap in the distribution of eigenvalues of the Lindblad generator. We find that simple generators with a single jump operator are slowly mixing, and relax algebraically in time, due to the closing of the spectral gap in the thermodynamic limit. Introducing additional jump operators or a Hamiltonian opens up a spectral gap which remains finite in the thermodynamic limit, leading to exponential relaxation and thus rapid mixing. We use the method of moments and introduce a novel diagrammatic expansion to determine exactly the form factor to leading order in Hilbert space dimension $N$. We also present numerical support for our main results.

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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