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arXiv 2401.10985quant-phcond-mat.str-el
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一种计算量子动力学中精确非绝热项的数值方法

A numerical approach for calculating exact non-adiabatic terms in quantum dynamics

Ewen D C Lawrence, Sebastian F J Schmid, Ieva Čepaitė, Peter Kirton, Callum W Duncan

AI总结:

本研究提出一种利用哈密顿量对易子构建绝热量规势基的新方法,可计算量子动力学中的非绝热项,难求解时可截断求近似,还通过多图横场伊辛模型验证了图结构对AGP项数标度的影响。

摘要:

理解非绝热项如何影响量子动力学,是改进量子技术各类协议的基础。我们提出一种计算绝热量规势(Adiabatic Gauge Potential,AGP)的新方法,该势可给出由哈密顿量的时间依赖性产生的非绝热项信息。我们的方法利用哈密顿量的对易子构建AGP的合适基,当精确结果难以求解时,可轻松对该基进行截断以得到近似形式。我们使用该方法研究了多种图上横场伊辛模型(transverse field Ising model)的AGP,揭示了不同的底层图结构如何导致AGP所需项数呈现出截然不同的标度关系。

英文摘要:

Understanding how non-adiabatic terms affect quantum dynamics is fundamental to improving various protocols for quantum technologies. We present a novel approach to computing the Adiabatic Gauge Potential (AGP), which gives information on the non-adiabatic terms that arise from time dependence in the Hamiltonian. Our approach uses commutators of the Hamiltonian to build up an appropriate basis of the AGP, which can be easily truncated to give an approximate form when the exact result is intractable. We use this approach to study the AGP obtained for the transverse field Ising model on a variety of graphs, showing how the different underlying graph structures can give rise to very different scaling for the number of terms required in the AGP.

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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