Amplification and suppression of system-bath correlation effects in an open many-body system

TL;DR

This paper investigates how many-body effects amplify system-bath correlations in open quantum systems of multiple atoms, revealing challenges for quantum control and state protection due to these correlations.

Contribution

It demonstrates that system-bath correlation effects are amplified in many-body quantum systems and explores their suppression via dynamical decoupling.

Findings

Correlation effects scale inversely with atom number

Effects are significant even with weak individual interactions

Dynamical decoupling can suppress correlation-induced dynamics

Abstract

Understanding the rich dynamics of open quantum systems is of fundamental interest to quantum control and quantum information processing. By considering an open system of many identical two-level atoms interacting with a common bath, we show that effects of system-bath correlations are amplified in a many-body system via the generation of a short time scale inversely proportional to the number of atoms. Effects of system-bath correlations are therefore considerable even when each individual atom interacts with the bath weakly. We further show that correlation-induced dynamical effects may still be suppressed via the dynamical decoupling approach, but they present a challenge for quantum state protection as the number of atom increases.