We study a system of two distant quantum emitters coupled via a one-dimensional waveguide where the electromagnetic field has a direction-dependent velocity. As a consequence, the onset of collective emission is non-simultaneous and, for appropriate parameters, while one of the emitters exhibits superradiance the other can be subradiant. Interference effects enable the system to radiate in a preferential direction depending on the atomic state and the field propagation phases. We characterize such directional emission as a function of various parameters, delineating the conditions for optimal directionality.
@article{arxiv.2108.12951,
title = {Dissimilar collective decay and directional emission from two quantum emitters},
author = {P. Solano and P. Barberis-Blostein and K. Sinha},
journal= {arXiv preprint arXiv:2108.12951},
year = {2022}
}