论文标题

通过相干控制的热化过程激活热状态

Activation of thermal states by coherently controlled thermalization processes

论文作者

Simonov, Kyrylo, Roy, Saptarshi, Guha, Tamal, Zimborás, Zoltán, Chiribella, Giulio

论文摘要

热化过程降低了任何工作介质的状态,将任何初始状态变成无源的状态,无法从中提取工作。最近,已经表明,如果在称为量子开关的情况下以相干控制的顺序进行两个相同的热化过程,则可以避免这种降解。在某些情况下,对订单的控制甚至可以在媒介最初处于被动状态时可以提取工作。但是,这种激活现象受到限制:要提取非零的工作,培养基的初始温度应小于储层温度的一半。在这里,我们分析了此限制,表明即使介质以相干控制的顺序与$ n \ ge 2 $储层相互作用,它仍然存在。然后,我们表明,当介质和控制系统最初相关时,可以提高限制。特别是,当培养基和对照纠缠时,对于培养基的局部温度的每个初始值,就有可能进行工作提取。

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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