Centre for Engineered Quantum Systems, Department of Physics and Astronomy, Macquarie University, Sydney NSW 2113, Australia.
Phys Rev E. 2019 Sep;100(3-1):032129. doi: 10.1103/PhysRevE.100.032129.
We consider a quantum engine driven by repeated weak interactions with a heat bath of identical three-level atoms. This model was first introduced by Scully et al. [Science 299, 862 (2003)SCIEAS0036-807510.1126/science.1078955], who showed that coherence between the energy-degenerate ground states serves as a thermodynamic resource that allows operation of a thermal cycle with a coherence-dependent thermalization temperature. We consider a similar engine out of the quasistatic limit and find that the ground-state coherence also determines the rate of thermalization, therefore increasing the output power and the engine efficiency only when the thermalization temperature is reduced; revealing a more nuanced perspective of coherence as a resource. This allows us to optimize the output power by adjusting the coherence and relative stroke durations.
我们考虑了一个由与具有相同三能级原子的热浴重复弱相互作用驱动的量子引擎。Scully 等人首次提出了这个模型[Science 299, 862 (2003)SCIEAS0036-807510.1126/science.1078955]，他们表明，能量简并基态之间的相干性可用作热力学资源，允许具有相干依赖性热化温度的热循环运行。我们考虑了类似的量子极限外的引擎，并发现基态相干性也决定了热化速率，因此仅当热化温度降低时，才会增加输出功率和发动机效率；揭示了相干性作为资源的更细微的视角。这使我们能够通过调整相干性和相对冲程持续时间来优化输出功率。
