Cavity-assisted quantum bath engineering

TL;DR

This paper demonstrates how to engineer a quantum bath using a microwave cavity to autonomously prepare and cool a superconducting artificial atom into desired quantum states, enhancing control over quantum systems.

Contribution

It introduces a method to tailor microwave photon shot noise for dissipative state preparation and cooling of superconducting qubits, advancing quantum control techniques.

Findings

Successfully prepared arbitrary superpositions of atom states.

Achieved cooling of the dressed atom state to low temperatures.

Enhanced state purity in the presence of thermal noise.

Abstract

We demonstrate quantum bath engineering for a superconducting artificial atom coupled to a microwave cavity. By tailoring the spectrum of microwave photon shot noise in the cavity, we create a dissipative environment that autonomously relaxes the atom to an arbitrarily specified coherent superposition of the ground and excited states. In the presence of background thermal excitations, this mechanism increases the state purity and effectively cools the dressed atom state to a low temperature.