A quantum heat engine driven by atomic collisions.
A quantum heat engine driven by atomic collisions.
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DOI：
10.1038/s41467-021-22222-z
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发表时间：
2021-04-06
影响因子：
16.6
通讯作者：
Widera A
中科院分区：
文献类型：
--
作者：
Bouton Q;Nettersheim J;Burgardt S;Adam D;Lutz E;Widera A
量子热机受到与其离散能谱相关的量子涨落的影响。这种涨落对量子体系中热机的可靠运行提出了质疑。在这里，我们实现了一个内可逆的量子奥托循环在大准自旋态的铯杂质浸泡在超冷铷浴。内可逆机器是内部可逆的，不可逆损失仅通过热接触发生。我们采用量子控制来调节通过非弹性自旋交换碰撞发生的热传递的方向。我们进一步使用单个原子的全计数统计来监测在单量子水平上的发动机和浴之间的量子化热交换，并且另外评估功率输出的平均值和方差。我们优化了量子热机的性能以及稳定性，实现了高效率，大功率输出和小功率输出波动。设计可靠的纳米级量子热发动机，实现高效率、高功率和高稳定性，具有重要的基础和现实意义。在这里，作者报告了在原子Rb浴中使用单个中性Cs原子实现这样的量子机，其中通过非弹性自旋交换碰撞的量子化热交换被控制在单量子水平。
Quantum heat engines are subjected to quantum fluctuations related to their discrete energy spectra. Such fluctuations question the reliable operation of thermal machines in the quantum regime. Here, we realize an endoreversible quantum Otto cycle in the large quasi-spin states of Cesium impurities immersed in an ultracold Rubidium bath. Endoreversible machines are internally reversible and irreversible losses only occur via thermal contact. We employ quantum control to regulate the direction of heat transfer that occurs via inelastic spin-exchange collisions. We further use full-counting statistics of individual atoms to monitor quantized heat exchange between engine and bath at the level of single quanta, and additionally evaluate average and variance of the power output. We optimize the performance as well as the stability of the quantum heat engine, achieving high efficiency, large power output and small power output fluctuations. Designing reliable nanoscale quantum-heat engines achieving high efficiency, high power and high stability is of fundamental and practical interest. Here, the authors report the realization of such a quantum machine using individual neutral Cs atoms in an atomic Rb bath, in which quantized heat exchange via inelastic spin-exchange collisions is controlled at the level of single quanta.
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影响因子：
8.6
作者：
Plastina, F.;Alecce, A.;Zambrini, R.
通讯作者：
Zambrini, R.
影响因子：
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作者：
FANO, U
通讯作者：
FANO, U
影响因子：
8.6
作者：
de Assis, Rogerio J.;de Mendonca, Taysa M.;de Almeida, Norton G.
通讯作者：
de Almeida, Norton G.
影响因子：
6.7
作者：
Pezzutto, Marco;Paternostro, Mauro;Omar, Yasser
通讯作者：
Omar, Yasser
影响因子：
3.5
作者：
ANDRESEN, B;SALAMON, P;BERRY, RS
通讯作者：
BERRY, RS