Simultaneous cooling of an artificial atom and its neighboring quantum system

TL;DR

This paper introduces a method to simultaneously cool an artificial atom and its neighboring quantum system by manipulating the atom's states and resonant interactions, demonstrating robustness and effectiveness.

Contribution

The authors propose a novel cooling protocol that simultaneously cools an artificial atom and its nearby quantum system through state manipulation and resonant coupling.

Findings

Cooling is robust against different quantum system types.

The method effectively reduces the energy of both subsystems.

The protocol is applicable to various quantum systems connected to the atom.

Abstract

We propose an approach for cooling both an artificial atom (e.g., a flux qubit) and its neighboring quantum system, the latter modeled by either a quantum two-level system or a quantum resonator. The flux qubit is cooled by manipulating its states, following an inverse process of state population inversion, and then the qubit is switched on to resonantly interact with the neighboring quantum system. By repeating these steps, the two subsystems can be simultaneously cooled. Our results show that this cooling is robust and effective, irrespective of the chosen quantum systems connected to the qubit.