Role of initial system-bath correlation on coherence trapping

TL;DR

This paper investigates how initial correlations between a qubit and a non-Markovian bath influence coherence trapping, showing that such correlations can enhance stationary coherence and affect the system's evolution speed.

Contribution

It demonstrates that initial qubit-bath correlations can improve coherence trapping efficiency and identifies optimal conditions for maximizing stationary coherence.

Findings

Initial correlations enhance coherence trapping.

Optimized parameters maximize stationary coherence.

Initial correlations influence evolution speed.

Abstract

We study the coherence trapping of a qubit correlated initially with a non-Markovian bath in a pure dephasing channel. By considering the initial qubit-bath correlation and the bath spectral density, we find that the initial qubit-bath correlation can lead to a more efficient coherence trapping than that of the initially separable qubit-bath state. The stationary coherence in the long time limit can be maximized by optimizing the parameters of the initially correlated qubit-bath state and the bath spectral density. In addition, the effects of this initial correlation on the maximal evolution speed for the qubit trapped to its stationary coherence state are also explored.