通过相干控制的热化过程激活热态
Activation of thermal states by coherently controlled thermalization processes
AI总结：
本文研究量子SWITCH中相干控制热化顺序对功提取的限制，证明介质与控制初始纠缠可突破温度低于热库一半的限制，实现任意初始温度下的功提取。
摘要：
热化过程会使任何工作介质的态退化，将任意初始态转变为无法提取功的被动态。最近的研究表明，如果两个相同的热化过程以相干控制的顺序进行，即所谓的量子SWITCH场景，这种退化就可以避免。在某些情况下，对顺序的控制甚至能在介质初始处于被动态时实现功的提取。然而，这种激活现象受到一个限制：要提取非零功，介质的初始温度应低于热库温度的一半。本文分析了这一限制，证明即使介质以相干控制的顺序与N≥2个热库相互作用，该限制仍然成立。随后，我们证明当介质与控制系统初始关联时，这一限制可以被解除。特别是当介质与控制之间纠缠时，对于介质局域温度的任意初始值，功的提取都成为可能。
英文摘要：
Thermalization processes degrade the states of any working medium, turning any initial state into a passive state from which no work can be extracted. Recently, it has been shown that this degradation can be avoided if two identical thermalization processes take place in coherently controlled order, in a scenario known as the quantum SWITCH. In some situations, control over the order even enables work extraction when the medium was initially in a passive state. This activation phenomenon, however, is subject to a limitation: to extract non-zero work, the initial temperature of the medium should be less than half of the temperature of the reservoirs. Here we analyze this limitation, showing that it still holds true even when the medium interacts with $N\ge 2$ reservoirs in a coherently-controlled order. Then, we show that the limitation can be lifted when the medium and the control systems are initially correlated. In particular, when the medium and control are entangled, work extraction becomes possible for every initial value of the local temperature of the medium.
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