Inducing nontrivial qubit coherence through a controlled dispersive environment

TL;DR

This paper demonstrates how the dispersive regime of the Jaynes-Cummings model can be used to engineer environments that preserve qubit energy and induce specific coherence dynamics, useful for studying open quantum systems.

Contribution

It introduces a method to construct an environment within the dispersive regime that maintains qubit energy and controls coherence decay, with a compact coherence expression derived for thermal modes.

Findings

Derived a compact expression for qubit coherence in a finite thermal environment.

Showed how to tune parameters for short-time monotonic decay of coherence.

Provided a platform compatible with current quantum technologies for open system studies.

Abstract

We show how the dispersive regime of the Jaynes-Cummings model may serve as a valuable tool to the study of open quantum systems. We employ it in a bottom-up approach to build an environment that preserves qubit energy and induces varied coherence dynamics. We then present the derivation of a compact expression for the qubit coherence, applied here to the case of a finite number of thermally populated modes in the environment. We also discuss how the model parameters can be adjusted to facilitate the production of short-time monotonic decay (STMD) of the qubit coherence. Our results provide a broadly applicable platform for the investigation of energy-conserving open system dynamics which is fully within the grasp of current quantum technologies.