# Non-Markovian collective emission from macroscopically separated emitters

## TL;DR

This paper investigates how two quantum emitters interact with a waveguide in a non-Markovian regime, revealing enhanced or suppressed collective emission due to time-delayed feedback effects.

## Contribution

It introduces a model of non-Markovian collective emission from separated emitters, highlighting the role of retarded backaction and feedback in modifying decay rates.

## Key findings

- Enhanced superradiance observed due to feedback
- Inhibition of emission beyond Dicke limits
- Non-Markovian dynamics significantly alter decay behavior

## Abstract

We study the collective radiative decay of a system of two two-level emitters coupled to a one-dimensional waveguide in a regime where their separation is comparable to the coherence length of a spontaneously emitted photon. The electromagnetic field propagating in the cavity-like geometry formed by the emitters exerts a retarded backaction on the system leading to strongly non-Markovian dynamics. The collective spontaneous emission rate of the emitters exhibits an enhancement or inhibition beyond the usual Dicke super- and sub-radiance due to a self-consistent coherent time-delayed feedback.