Decoherence suppression of open quantum systems through a strong coupling to non-Markovian reservoirs

TL;DR

This paper introduces a novel decoherence suppression mechanism for open quantum systems using strong coupling to non-Markovian reservoirs, leveraging bound states to control dissipation and decoherence.

Contribution

It presents a new approach to suppress decoherence via strong back-reaction from non-Markovian environments, contrasting with traditional decoupling methods.

Findings

Strong non-Markovian coupling suppresses decoherence of optical cat states.

Bound states in the Green function determine dissipation dynamics.

Application to photonic nanocavities demonstrates effective decoherence control.

Abstract

In this paper, we provide a mechanism of decoherence suppression for open quantum systems in general, and that for "Schrodinger cat-like" state in particular, through the strong couplings to non-Markovian reservoirs. Different from the usual strategies of suppressing decoherence by decoupling the system from the environment in the literatures, here the decoherence suppression employs the strong back-reaction from non-Markovian reservoirs. The mechanism relies on the existence of the singularities (bound states) of the nonequilibrium retarded Green function which completely determines the dissipation and decoherence dynamics of open systems. As an application, we examine the decoherence dynamics of a photonic crystal nanocavity that is coupled to a waveguide. The strong non-Markovian suppression of decoherence for the optical cat state is attained.