# The Quantum Refrigerator: The quest for absolute zero - Quantum Physics

Abstract: The scaling of the optimal cooling power of a reciprocating quantumrefrigerator is sought as a function of the cold bath temperature as $T c \to0$. The working medium consists of noninteracting particles in a harmonicpotential. Two closed-form solutions of the refrigeration cycle are analyzed,and compared to a numerical optimization scheme, focusing on cooling towardzero temperature. The optimal cycle is characterized by linear relationsbetween the heat extracted from the cold bath, the energy level spacing of theworking medium and the temperature. The scaling of the optimal cooling rate isfound to be proportional to $T c^{3-2}$ giving a dynamical interpretation tothe third law of thermodynamics.

Author: Yair Rezek, Peter Salamon, Karl Heinz Hoffmann, Ronnie Kosloff

Source: https://arxiv.org/