从随机哈密顿到量子模拟:探索激子动力学中的记忆效应

IF 2.8 2区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Federico Gallina, Matteo Bruschi, Barbara Fresch
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引用次数: 0

摘要

用随机量子轨迹揭示开放量子系统动力学提供了一幅开放系统动力学图景,它始终如一地考虑了环境波动的有限相关时间所产生的记忆效应。这些波动极大地影响了激子系统的相干性和能量传输特性。当它们的相关时间与哈密顿演化的时间尺度相当时,就会导致开放系统动力学偏离马尔可夫极限。在这项工作中,我们通过随机哈密顿传播器来揭示激子动力学,从而设计出模拟激子传输的量子电路,捕捉有限记忆效应。除了能够合成可参数化的量子电路外,随机单元传播器还为研究激子输运的非马尔可夫效应提供了一个透明的框架。我们的分析揭示了环境相关时间与传输效率之间的微妙关系,确定了一种 "记忆辅助 "量子传输机制,在这种机制下,时间相关波动可使系统达到更高的效率。然而,这一特性并不普遍,只有与系统哈密顿的具体特征相结合才能实现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
From stochastic Hamiltonian to quantum simulation: exploring memory effects in exciton dynamics
The unraveling of open quantum system dynamics in terms of stochastic quantum trajectories offers a picture of open system dynamics that consistently considers memory effects stemming from the finite correlation time of environment fluctuations. These fluctuations significantly influence the coherence and energy transport properties of excitonic systems. When their correlation time is comparable to the timescale of the Hamiltonian evolution, it leads to the departure of open system dynamics from the Markovian limit. In this work, we leverage the unraveling of exciton dynamics through stochastic Hamiltonian propagators to design quantum circuits that simulate exciton transport, capturing finite memory effects. In addition to enabling the synthesis of parametrizable quantum circuits, stochastic unitary propagators provide a transparent framework for investigating non-Markovian effects on exciton transport. Our analysis reveals a nuanced relationship between environment correlation time and transport efficiency, identifying a regime of ‘memory-assisted’ quantum transport where time-correlated fluctuations allow the system to reach higher efficiency. However, this property is not universal and can only be realized in conjunction with specific features of the system Hamiltonian.
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来源期刊
New Journal of Physics
New Journal of Physics 物理-物理:综合
CiteScore
6.20
自引率
3.00%
发文量
504
审稿时长
3.1 months
期刊介绍: New Journal of Physics publishes across the whole of physics, encompassing pure, applied, theoretical and experimental research, as well as interdisciplinary topics where physics forms the central theme. All content is permanently free to read and the journal is funded by an article publication charge.
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