Robust non-Markovianity in ultracold gases

TL;DR

This paper demonstrates that a specially designed probe qubit can reliably detect properties of a Bose-Einstein condensate even in the presence of thermal fluctuations, highlighting its robustness and potential for quantum sensing.

Contribution

It introduces a novel probe qubit architecture that maintains sensitivity to BEC properties despite thermal noise, extending previous zero-temperature studies.

Findings

Probe qubit sensitivity remains high under thermal fluctuations.

Thermal resilience is due to the specific architecture of the probe.

The method enables robust environmental probing in realistic conditions.

Abstract

We study the effect of thermal fluctuations on a probe qubit interacting with a Bose-Einstein condensed (BEC) reservoir. The zero-temperature case was studied in [Haikka P et al 2011 Phys. Rev. A 84 031602], where we proposed a method to probe the effects of dimensionality and scattering length of a BEC based on its behavior as an environment. Here we show that the sensitivity of the probe qubit is remarkably robust against thermal noise. We give an intuitive explanation for the thermal resilience, showing that it is due to the unique choice of the probe qubit architecture of our model.