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arXiv 1504.04744quant-ph
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强耦合量子热机

Strongly coupled quantum heat machines

David Gelbwaser-Klimovsky, Alán Aspuru-Guzik

摘要:

量子热机(QHM)模型通常假设与浴的弱耦合。这种假设是基于系统之间的可分性原理,并允许推导出这种情况下的演化方程。在弱耦合状态下,机器的输出受到耦合强度的限制,限制了它们的应用。为了克服这一局限性,我们在这里分析QHM在几乎未经探索的强耦合制度,分离性,以及其他标准的热力学假设,可能不再成立。我们表明,强耦合QHM可能是有效的弱耦合对应。此外,我们发现了一种新的周转行为,他们的输出饱和,并在超强耦合的极限消失。

英文摘要:

Quantum heat machines (QHMs) models generally assume a weak coupling to the baths. This supposition is grounded in the separability principle between systems and allows the derivation of the evolution equation for this case. In the weak coupling regime, the machine's output is limited by the coupling strength, restricting their application. Seeking to overcome this limitation, we here analyze QHMs in the virtually unexplored strong coupling regime, where separability, as well as other standard thermodynamic assumptions, may no longer hold. We show that strongly coupled QHMs may be as efficient as their weakly coupled counterparts. In addition, we find a novel turnover behavior where their output saturates and disappears in the limit of ultra-strong coupling.

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