Noise assisted quantum coherence protection in hierarchical environment

TL;DR

This paper explores how noise, especially non-Markovian noise, can be used to protect quantum coherence in a hierarchical environment, revealing that certain noise interactions can suppress decoherence.

Contribution

It demonstrates that non-Markovian noise with longer memory can be mitigated by Markovian noise with shorter memory, offering new insights into noise-assisted coherence protection.

Findings

Non-Markovian noise influences coherence protection significantly.

Shorter memory Markovian noise can suppress decoherence from longer memory non-Markovian noise.

The study suggests potential for designing noise-assisted quantum coherence schemes.

Abstract

In this paper, we investigate coherence protection of a quantum system coupled to a hierarchical environment by utilizing noise. As an example, we solve the Jaynes-Cummings (J-C) model in presence of both a classical and a quantized noise. The master equation is derived beyond the Markov approximation, where the influence of memory effects from both noises is taken into account. More importantly, we find that the performance of the coherence protection sensitively depends on the non-Markovian properties of both noises. By analyzing the mathematical mechanism of the coherence protection, we show the decoherence caused by a non-Markovian noise with longer memory time can be suppressed by another Markovian noise with shorter memory time. Last but not least, as an outlook, we try to analyze the connection between the atom-cavity entanglement and the atomic coherence, then discuss the possible clue to search for the required noise. The results presented in this paper show the possibility of protecting coherence by utilizing noise and may open a new path to design noise-assisted coherence protection schemes.