Frozen condition of quantum coherence for atoms on a stationary trajectory

TL;DR

This paper develops a formalism to analyze quantum coherence in two atoms on a stationary trajectory, identifying conditions for coherence to remain nonzero and exploring the roles of super- and subradiant rates.

Contribution

It introduces a criterion for frozen quantum coherence that is insensitive to initial states and relates atomic properties to thermal bath characteristics.

Findings

Quantum coherence can be frozen under specific conditions.

Super- and subradiant rates influence coherence evolution.

Enhanced coherence and subradiant states can be achieved from initial states.

Abstract

We consider two co-moving atoms on a stationary trajectory and develop a formalism to characterize the properties of such atoms. We give a criterion under which quantum coherence (QC) is frozen to a nonzero value and show that the frozen condition (FC) is not so sensitive to the initial condition of state. We introduce the concept super- and subradiant spontaneous excitation rates which plays an equivalent role as conventional collective emission rates in the evolution of quantum coherence. We also give the general relationship between the quantities characterizing properties of atoms in thermal bath and show that the enhanced quantum coherence and subradiant state can be gained from initial state.