Electro-optic polarization tuning of microcavities with a single quantum dot

TL;DR

This paper introduces a three-contact oxide aperture microcavity with embedded quantum dots, enabling independent tuning of quantum dot wavelength and cavity birefringence, crucial for polarization-based quantum photonic applications.

Contribution

The study demonstrates a novel microcavity design that allows independent electro-optic tuning of polarization splitting and quantum dot resonance, advancing quantum photonics technology.

Findings

Achieved polarization splitting tuning of ~5 GHz.

Enabled independent tuning of quantum dot wavelength and cavity birefringence.

Facilitated polarization degeneracy for quantum gate applications.

Abstract

We present an oxide aperture microcavity with embedded quantum dots that utilizes a three contact design to independently tune the quantum dot wavelength and birefringence of the cavity modes. A polarization splitting tuning of $\sim$5 GHz is observed. For typical microcavity polarization splittings, the method can be used to achieve perfect polarization degeneracy that is required for many polarization-based implementations of photonic quantum gates. The embedded quantum dot wavelength can be tuned into resonance with the cavity, independent of the polarization tuning.