Bloch-wave engineering of quantum dot-micropillars for cavity quantum electrodynamics experiments

TL;DR

This paper demonstrates the use of Bloch-wave engineering to create high-quality GaAs/AlAs micropillars with enhanced strong coupling properties for cavity quantum electrodynamics, achieving record quality factors and significant Rabi splitting.

Contribution

It introduces a novel Bloch-wave engineering design for micropillars that significantly improves their quality factor and coupling efficiency in quantum electrodynamics experiments.

Findings

Achieved a quality factor of 13,600 in micropillars.

Observed a Rabi splitting of 85 μeV.

Demonstrated strong coupling with modest oscillator strength quantum dots.

Abstract

We have employed Bloch-wave engineering to realize submicron diameter ultra-high quality factor GaAs/AlAs micropillars (MPs). The design features a tapered cavity in which the fundamental Bloch mode is subject to an adiabatic transition to match the Bragg mirror Bloch mode. The resulting reduced scattering loss leads to record-high visibility of the strong coupling in MPs with modest oscillator strength quantum dots. A quality factor of 13,600 and a Rabi splitting of 85 \mueV with an estimated visibility v of 0.38 are observed for a small mode volume MP with a diameter dc of 850 nm.