Nanoscale Heat Engine Beyond the Carnot Limit
Nanoscale Heat Engine Beyond the Carnot Limit
复制标题
DOI：
10.1103/physrevlett.112.030602
复制
发表时间：
2014-01-22
影响因子：
8.6
通讯作者：
Lutz, E.
中科院分区：
文献类型：
--
作者：
Rossnagel, J.;Abah, O.;Lutz, E.
本文考虑耦合到压缩热库的含时谐振子的量子奥托循环。我们发现，在最大功率的效率增加的程度压缩，超过标准的卡诺极限和接近单位指数大压缩参数。我们进一步提出了一个实验方案来实现这样的模型系统，通过使用一个单一的被困离子在一个线性的保罗陷阱与特殊的几何形状。我们的分析调查支持蒙特卡洛模拟，证明我们的建议的可行性。对于现实的陷阱参数，在最大功率的效率的增加达到了4倍，大大超过了卡诺约束。
We consider a quantum Otto cycle for a time-dependent harmonic oscillator coupled to a squeezed thermal reservoir. We show that the efficiency at maximum power increases with the degree of squeezing, surpassing the standard Carnot limit and approaching unity exponentially for large squeezing parameters. We further propose an experimental scheme to implement such a model system by using a single trapped ion in a linear Paul trap with special geometry. Our analytical investigations are supported by Monte Carlo simulations that demonstrate the feasibility of our proposal. For realistic trap parameters, an increase of the efficiency at maximum power of up to a factor of 4 is reached, largely exceeding the Carnot bound.