Polarization degenerate solid-state cavity QED

TL;DR

This paper investigates a polarization degenerate microcavity with charge-controlled quantum dots, demonstrating the importance of polarization degrees of freedom for quantum device applications and providing experimental validation of a coherent cavity QED model.

Contribution

It introduces and experimentally explores a polarization degenerate cavity QED system with charge-controlled quantum dots, highlighting the role of polarization in quantum dynamics.

Findings

Good agreement with a polarization-dependent cavity QED model

Full polarization degrees of freedom reveal QD transition dynamics

Potential for postselection-free quantum entanglement devices

Abstract

A polarization degenerate microcavity containing charge-controlled quantum dots (QDs) enables equal coupling of all polarization degrees of freedom of light to the cavity QED system, which we explore through resonant laser spectroscopy. We first measure interference of the two fine-split neutral QD transitions and find very good agreement of this V-type three-level system with a coherent polarization dependent cavity QED model. We also study a charged QD that suffers from decoherence, and find also in this case that availability of the full polarization degrees of freedom is crucial to reveal the dynamics of the QD transitions. Our results pave the way for postselection-free quantum devices based on electron spin-photon polarization entanglement.