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arXiv 2007.15669quant-ph
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耦合二能级系统中能量的量子输运与经典输运

Quantum versus classical transport of energy in coupled two-level systems

I. Medina, S. V. Moreira, F. L. Semião

摘要:

我们考虑耦合量子系统链中的能量输运问题,目的是阐明非经典资源如何影响输运。我们研究的情况下,无论是相干或非相干的能量跳跃发生在链。在这里,非相干能量跳跃被称为“经典”的情况下,针对其完全对角动力学的基础上形成的去耦网站的本征态。我们专注于一个线性链的情况下,两个水平的网站,并找到一个跳跃率阈值以上的相干量子的情况下是更有效的非相干的。然后,我们将量子跳跃率与相干性全局最大值联系起来,这使我们能够声明存在一个相干阈值,在该阈值之上,量子场景更有效。接下来,我们考虑由动力学产生的综合相干性,并展示它与量子操作的侵入性之间的关系。我们的研究结果强烈表明量子侵入性作为量子传输的资源所发挥的重要作用。

英文摘要:

We consider the problem of energy transport in a chain of coupled quantum systems with the goal of shedding light on how nonclassical resources can affect transport. We study the cases for which either coherent or incoherent energy hopping takes place in the chain. Here, incoherent energy hopping is referred to as the "classical" scenario in allusion to its fully diagonal dynamics in the basis formed by the eigenstates of the decoupled sites. We focus on the case of a linear chain of two-level sites and find a hopping rate threshold above which the coherent quantum case is more efficient than the incoherent counterpart. We then link the quantum hopping rate to the coherence global maximum, which allows us to state that there is a coherence threshold above which the quantum scenario is more efficient. Next, we consider the integrated coherence generated by the dynamics and show how it is related to what is known as the invasiveness of a quantum operation. Our results strongly suggest the significant role played by quantum invasiveness as a resource for quantum transport.

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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