Cavity QED with molecular defects coupled to a photonic crystal cavity

TL;DR

This paper presents a scalable hybrid platform for cavity QED with multiple coherent molecular emitters, utilizing spectral tuning and collective resonance to enable many-body quantum states in integrated photonic systems.

Contribution

It introduces a novel approach combining emitter synthesis and nanophotonic fabrication, allowing scalable coupling of multiple emitters to a single cavity mode with spectral control.

Findings

Coupled several coherent emitters to a single cavity mode.

Achieved long-lived spectral tuning of molecular emitters.

Demonstrated formation of collective quantum states by tuning molecules into resonance.

Abstract

We implement permanent spectral tuning to bring lifetime-limited emitters into collective resonance within an integrated photonic cavity. This addresses a fundamental challenge in solid-state cavity QED: combining multiple coherent quantum emitters with scalable nanophotonics. Our hybrid approach decouples emitter synthesis from nanophotonic fabrication using straightforward techniques that make cavity QED broadly accessible. High doping densities allow us to couple several coherent emitters to a single cavity mode, while optically-induced frequency shifting provides long-lived spectral control. By tuning two molecules into resonance, we demonstrate controlled formation of collective quantum states, establishing a scalable platform for many-body cavity QED. This opens pathways toward chemically-designed quantum systems where optical properties are engineered through synthetic chemistry.