Inducing nontrivial qubit coherence through a controlled dispersive environment

Author(s)

Teixeira, Wallace S. ; Nicacio, Fernando ; Semiao, Fernando L.

• Document type: Journal article
• Source: PHYSICAL REVIEW A; v. 99, n. 3, p. 9-pg., 2019-03-05.

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. (AU)

• FAPESP's process: 17/09058-2 - Non-trivial open quantum dynamics motivated by quantum technologies
• Grantee: Wallace Santos Teixeira
• Support Opportunities: Scholarships in Brazil - Doctorate