Non-Markovian environment induced anomaly in steady state quantum coherence

TL;DR

This paper investigates how non-Markovian environmental effects influence steady state quantum coherence, revealing a peak in coherence due to environmental memory and showing that squeezing can enhance coherence.

Contribution

It provides a microscopic analysis of environment-induced steady state quantum coherence, highlighting the role of non-Markovian effects and squeezing in its generation and control.

Findings

Peak in SSQC for non-Markovian baths due to competing mechanisms

SSQC disappears in Markovian environments

Squeezing amplifies the generated SSQC

Abstract

Environment induced steady state quantum coherence (SSQC) is a captivating phenomenon that challenges conventional understandings of decoherence. In this letter, we delve into the foundational aspects of environment-induced SSQC, shedding light on its emergence within the framework of system-bath interactions. Starting from a microscopic system-bath coupled model, we investigate the dependence of SSQC on environmental memory effects, bath temperature, system-bath coupling strength, and squeezing parameters. Our findings reveal that the environment not only acts as a generator but also as a disruptor of SSQC. A peak will exist for a non-Markovian bath, which is a result of competition between these two mechanisms. Interestingly, the peak disappears in Markovian case. Additionally, we observe that the generated SSQC can be further amplified through environment squeezing.