Polarization dependent light-matter coupling and highly indistinguishable resonance fluorescence photons from quantum dot-micropillar cavities with elliptical cross-section

TL;DR

This paper investigates the optical properties of elliptical quantum dot-micropillar cavities, revealing polarization-dependent light-matter interactions and demonstrating the emission of highly indistinguishable single photons with over 93% visibility.

Contribution

The study introduces an analytic model for elliptical cavity modes and demonstrates polarization-dependent Purcell enhancement and high-quality single-photon emission from quantum dots.

Findings

Elliptical micropillars support split cavity modes due to reduced symmetry.

Quantum dot emission shows polarization-dependent Purcell enhancement.

Achieved over 93% indistinguishability in emitted photons.

Abstract

We study the optical properties of coupled quantum dot-microcavity systems with elliptical cross section. First, we develop an analytic model that describes the spectrum of the cavity modes that are split due to the reduced symmetry of the resonator. By coupling the QD emission to the polarized fundamental cavity modes, we observe the vectorial nature of the Purcell enhancement, which depends on the intrinsic polarization of the quantum dot and its relative alignment with respect to the cavity axis. The variable interaction strength of the QD with the polarized cavity modes leads to the observation of strong and weak coupling. Finally, we demonstrate the capability of elliptical micropillars to emit single and highly indistinguishable photons (visibility over 93 \%).