Noise-assisted and monitoring-enhanced quantum bath tagging

TL;DR

This paper explores how adding and monitoring an extra environment can enhance the ability to distinguish different thermal bath statistics, with potential implementation in circuit QED systems.

Contribution

It introduces a novel approach using an additional environment and continuous monitoring to improve quantum bath discrimination capabilities.

Findings

Enhanced discrimination performance with an extra bath.

Improved results through continuous monitoring strategies.

Applicability to circuit QED setups.

Abstract

We analyze the capability of discriminating the statistical nature of a thermal bath by exploiting the interaction with an additional environment. We first shows that, at difference with the standard scenario where the additional environment is not present, the modified evolution induced by the mere presence of the extra bath allows to improve the discrimination task. We then also consider the possibility of continuously monitoring the additional environment and we discuss in detail how to obtain improved performances in the discrimination by considering different kinds of interaction, i.e. different jump operators, and different monitoring strategies corresponding to continuous homodyne and photo-detection. Our strategy can be in principle implemented in a circuit QED setup and paves the way to further developments of quantum probing via continuous monitoring.