Abstract

We propose a model of a quantum thermal refrigeration machine interacting with an external atom via an entanglement phenomenon. The machine is formed by three qubits of two-level, where each one interacts locally with its proper reservoir at different temperatures. The second qubit of the refrigerator and the external qubit are initially prepared in an entangled state. The effect of the quantum refrigerator on the entanglement of the final atomic state is studied. It is shown that the survival of the entanglement of the atomic system (Qubits 2 and 4) depends on the temperature of the second reservoir. The heat flow from the cold bath (cooling power) to the hot bath is discussed, where we prove that the refrigeration may be enhanced by the energy coming from the entangled external qubit. Indeed, it is shown that the enhancement of cooling power by increasing the degree of entanglement.

Graphic Abstract

中文翻译：

---

通过使用纠缠的外部系统评估冰箱的性能

摘要

我们提出了一种通过纠缠现象与外部原子相互作用的量子热制冷机模型。该机器由三个两级量子位组成，其中每个量子位在不同温度下与其适当的储存器局部相互作用。冰箱的第二个量子位和外部量子位最初以纠缠状态准备。研究了量子制冷机对最终原子态纠缠的影响。结果表明，原子系统（量子位 2 和 4）纠缠的存活取决于第二个储层的温度。讨论了从冷浴（冷却功率）到热浴的热流，我们证明了来自纠缠外部量子位的能量可以增强制冷。确实，

图形摘要