Quantum acceleration by an ancillary system in non-Markovian environments

TL;DR

This paper investigates how an ancillary system can accelerate quantum evolution in non-Markovian environments, revealing that interaction strength and environmental structure significantly influence the quantum speed limit.

Contribution

It introduces a model analyzing the impact of an ancillary system and hopping interaction on quantum speed limits in various non-Markovian environments, highlighting new acceleration mechanisms.

Findings

Quantum speed limit decreases with increased system-environment interaction.

Hopping interaction causes periodic oscillations in quantum speed limit.

Environmental structure and ancillary interaction determine evolution acceleration.

Abstract

We study the effect of an ancillary system on the quantum speed limit time in different non-Markovian environments. Through employing an ancillary system coupled with the quantum system of interest via hopping interaction and investigating the cases that both the quantum system and ancillary system interact with their independent/common environment, and the case that only the system of interest interacts with the environment, we find that the quantum speed limit time will become shorter with enhancing the interaction between the system and environment and show periodic oscillation phenomena along with the hopping interaction between the quantum system and ancillary system increasing. The results indicate that the hopping interaction with the ancillary system and the structure of environment determine the degree of which the evolution of the quantum system can be accelerated.