# Quantum light-matter interaction and controlled phonon scattering in a photonic Fano cavity

## TL;DR

This paper explores how Fano resonances in a specialized optical cavity enable unique light-matter interactions and phonon control, enhancing photon indistinguishability in quantum emitters.

## Contribution

It introduces a novel Fano cavity design that modifies quantum electrodynamics and phonon interactions, surpassing traditional cavity performance.

## Key findings

- Enhanced photon indistinguishability due to Fano interference
- Controlled phonon scattering through cavity design
- Altered energy leakage into vibrational modes

## Abstract

The Fano effect arises from the interference between a continuum of propagating modes and a localised resonance. By using this resonance as one of the mirrors in an optical cavity, a localised mode with a highly asymmetric line shape is obtained. Placing a single quantum emitter inside the cavity leads to a new regime of cavity quantum electrodynamics, where the light-matter interaction dynamics is fundamentally different from that observed in a conventional cavity with Lorenztian lineshape. Furthermore, when the vibrational dynamics of the emitter is taken into account, an intricate phonon-photon interplay arises, and the optical interference induced by the Fano mirror significantly alters the leakage of energy into vibrational modes. We demonstrate that this control mechanism improves the maximum attainable indistinguishability of emitted photons, as compared to an equivalent cavity with a conventional mirror.