The Self-contained Quantum Refrigerator With The Strong Internal Coupling

The past few years has witnessed the development of quantum optics, quantum infor-mation science, quantum thermodynamics and experimental technology, because of these, researchers are interested in quantum thermodynamics instead of classical macroscopic ther-modynamics. Quantum thermodynamics provides an important method from microcosmic point of view to understand the thermodynamic properties of the quantum world. In this paper, we mainly study the efficiency and the heat current of the self-contained quantum refrigerator in the strong internal couplingThis paper is mainly divided into three chapters. In the first chapter, we introduce the development of quantum mechanics, quantum information, quantum thermodynamics, and the arrangement of chapters. In the second chapter, we mainly introduce some basic theoretical knowledge of quantum thermodynamics, including heat flux, work, temperature, entropy, efficiency, quantum open system and so on. The third chapter is our main job. We first briefly introduce the research background of quantum refrigerator, and then we intro-duce the heat current and efficiency of the self-contained quantum refrigerator in the weak coupling regime. Finally, we design quantum refrigerator by utilizing the interaction of three atoms. We discuss the self-contained quantum refrigerator in the strong internal coupling by employing the quantum optical master equation. We find that the cooling efficiency of the self-contained quantum refrigerator is weakened instead of enhanced. Compared with the self-contained quantum refrigerator in the weak-coupling regime, the thermodynamic behavior of the strong internal coupling refrigerator is quite different and even converse.