Strong coupling between a single quantum dot and an L4/3 photonic crystal nanocavity

TL;DR

This paper demonstrates strong light-matter interaction between a single quantum dot and a high-Q photonic crystal nanocavity, achieving observable anti-crossing and confirming the potential for quantum photonic applications.

Contribution

It reports the first experimental realization of strong coupling between a quantum dot and an L4/3 photonic crystal nanocavity with high Q factors.

Findings

Achieved a Q factor of over 80,000 in fabricated cavities.

Confirmed strong coupling through spectral anti-crossing.

Demonstrated potential for quantum information processing.

Abstract

We demonstrate strong coupling between a single quantum dot and a GaAs-based L4/3-type photonic crystal nanocavity. The L4/3 cavity supports a high theoretical Q factor (~8{\times}10^6), a small mode volume (~0.32 (\lambda/n)^3), and an electric field distribution with the maximum electric field lying within the host dielectric material, which facilitates strong coupling with a quantum dot. We fabricated L4/3 cavities and observed a high Q factor over 80,000 using photoluminescence measurement. We confirmed strong coupling between a single quantum dot and an L4/3 cavity with a Q factor of 33,000 by observing a clear anti-crossing in the spectra.