Quantifying, characterizing and controlling information flow in ultracold atomic gases

TL;DR

This paper investigates how information flows between an impurity qubit and a Bose-Einstein condensate reservoir, demonstrating control over non-Markovian dynamics through reservoir engineering within realistic experimental conditions.

Contribution

It introduces a model for quantum information flow in ultracold gases and shows how to manipulate non-Markovian effects by engineering the reservoir parameters.

Findings

Information flux can be controlled via reservoir engineering.

A crossover between Markovian and non-Markovian dynamics is identified.

Reversed information flow indicates non-Markovian behavior.

Abstract

We study quantum information flow in a model comprising of an impurity qubit immersed in a Bose-Einstein condensed reservoir. We demonstrate how information flux between the qubit and the condensate can be manipulated by engineering the ultracold reservoir within experimentally realistic limits. We place a particular emphasis on non-Markovian dynamics, characterized by a reversed flow of information from the background gas to the qubit and identify a controllable crossover between Markovian and non-Markovian dynamics in the parameter space of the model.