Quantum speed limit and nonclassicality in open quantum system models using the Wigner function

TL;DR

This paper investigates how nonclassicality and quantum correlations influence the quantum speed limit in open quantum systems, using the Wigner function to analyze dynamics in models interacting with a squeezed thermal bath.

Contribution

It introduces a study of quantum speed limits in open systems with position-dependent coupling, highlighting the role of non-Markovianity and quantum correlations in accelerating evolution.

Findings

Quantum correlations speed up the evolution.

Non-Markovian behavior influences the quantum speed limit.

Interaction with a squeezed thermal bath affects system dynamics.

Abstract

The quantum speed limit and the Wigner function of open system models are studied. To this end, we use the phase covariant and a two-qubit model interacting with a squeezed thermal bath via position-dependent coupling. The dependence of the coupling on the position of the qubits allows for the study of the dynamics in the collective regime, which is conducive to speeding up the evolution. An interesting interplay is observed between non-Markovian behavior, quantumness, and the quantum speed limit. The presence of quantum correlations is seen to speed up the evolution.