Controllable superradiance scaling in photonic waveguide

TL;DR

This paper demonstrates how the superradiance scaling in a photonic waveguide can be actively controlled using an ensemble of control atoms, enabling tailored emission properties and enhanced chirality in waveguide QED systems.

Contribution

It introduces a method to control superradiance scaling via control atoms, revealing unconventional correlations and chiral effects in waveguide QED.

Findings

Superradiance scaling can be tuned to be lower, higher, or equal to Dicke superradiance.

Giant control atoms enhance chirality of superradiance.

Controllable superradiance effects are observable in waveguide QED experiments.

Abstract

We investigate the superradiance of two-level target atoms (TAs) coupled to a photonic waveguide, demonstrating that the scaling of the superradiance strength can be controlled on demand by an ensemble of control atoms (CAs). The scaling with respect to the number of TAs can be lower, higher, or equal to the traditional Dicke superradiance, depending on the relative positioning of the ensembles and the type of CAs (e.g., small or giant). These phenomena are attributed to unconventional atomic correlations. Furthermore, we observe chiral superradiance of the TAs, where the degree of chirality can be enhanced by giant CAs instead of small ones. The effects discussed in this work could be observed in waveguide QED experiments, offering a potential avenue for manipulating superradiance.