Strongly coupled single quantum dot in a photonic crystal waveguide cavity

TL;DR

This paper demonstrates a strongly coupled quantum dot-cavity system within a photonic crystal waveguide, showing clear resonance and vacuum Rabi splitting, advancing integrated quantum electrodynamics applications.

Contribution

It presents the first experimental realization of strong coupling between a single quantum dot and a photonic crystal cavity in a waveguide.

Findings

Clear cavity resonance identified via photoluminescence mapping.

Quantum dot exciton tuned to cavity mode by temperature.

Vacuum Rabi splitting of approximately 140 μeV observed.

Abstract

Cavities embedded in photonic crystal waveguides offer a promising route towards large scale integration of coupled resonators for quantum electrodynamics applications. In this letter, we demonstrate a strongly coupled system formed by a single quantum dot and such a photonic crystal cavity. The resonance originating from the cavity is clearly identified from the photoluminescence mapping of the out-of-plane scattered signal along the photonic crystal waveguide. The quantum dot exciton is tuned towards the cavity mode by temperature control. A vacuum Rabi splitting of ~ 140 \mueV is observed at resonance.