  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.
