# Subradiance dynamics in a singly-excited chiral-coupled atomic chain

## TL;DR

This paper explores how nonreciprocal chiral interactions in atomic chains influence subradiance, revealing tunable decay dynamics, effects of disorder, and potential for photon storage and routing.

## Contribution

It introduces a theoretical model of subradiance in chiral-coupled atomic chains with infinite-range interactions and analyzes the effects of nonreciprocity and disorder on decay dynamics.

## Key findings

- Presence of super- and subradiance in the system.
- Decay dynamics exhibit burst emissions and plateaus.
- Disorder induces localized excitations and affects decay curves.

## Abstract

We theoretically investigate the subradiance dynamics in a nonreciprocal chiral-coupled atomic chain, in which infinite-range dipole-dipole interaction emerges in the dissipation. We find that super- and subradiance are both present in the dissipation process following single photon excitation, and the decay dynamics shows burst emissions from uniform initial excitations, which reflects the influence of atomic ordering on the propagation of light-induced atom-atom correlations. By tuning the nonreciprocal couplings in the chiral-coupled atomic system, we show that the subradiance dynamics can be greatly modified. We further study the effect of atomic local disorder, and find occurrence of plateaus on the decay curve dependent on the defect locations, as well as persistent localized excitations induced by disorders. We also discuss the effect of imperfections of systems on the subradiance dynamics. Our results show rich opportunities in the chiral-coupled system toward photon storage and routing.