Quadratic enhancement in the reliability of collective quantum engines

Quadratic enhancement in the reliability of collective quantum engines
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集体量子引擎可靠性的二次增强

DOI:
10.1103/physreva.107.l040202
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发表时间:
2022
期刊:
影响因子:
2.9
通讯作者:
V. Mukherjee
V. Mukherjee
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Noufal Jaseem;Sai Vinjanampathy;V. Mukherjee

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我们研究了多体量子热机在存在集体系统-浴场相互作用时的涨落。我们发现开放量子系统中的集体效应可以被利用来开发高度一致的多体量子引擎。我们考虑量子奥托引擎,它由$n$自旋集体耦合到热水浴来建模。我们的结果表明,集体效应可以显著地减少输出功的波动,这是通过高可靠性($r$)和低热力学不确定性来量化的。与独立引擎相比,我们演示了可靠性的二次增强。我们将我们的分析扩展到多体物理中通常研究的相互作用自旋模型的情况,如Lipkin-Meshkov-Glick(LMG)模型,从而大大拓宽了集体效应在量子热机中的适用范围。这为许多身体系统中的现实集体量子热机铺平了道路。
We study fluctuations in many-body quantum heat engines operating in the presence of collective system-bath interactions. We show that collective effects in open quantum systems can be harnessed to develop highly consistent many-body quantum engines. We consider quantum Otto engines, modeled by $n$ spins collectively coupled to thermal baths. Our results show that collective effects can significantly reduce the fluctuations in the output work, quantified by high reliability ($r$) and low thermodynamic uncertainty. In contrast to independent engines, we demonstrate a quadratic enhancement of the reliability $r$ for their collective counterparts. We extend our analysis to the case of interacting spin models commonly studied in many-body physics, such as the Lipkin-Meshkov-Glick (LMG) model, thereby broadening the regime of applicability of collective effects in quantum thermal machines significantly. This paves the way forward for realistic collective quantum thermal machines in many body systems.
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