Polarization entanglement visibility of photon pairs emitted by a quantum dot embedded in a microcavity

TL;DR

This paper investigates how a quantum dot in a microcavity can produce polarization-entangled photon pairs with high visibility, especially under low pumping conditions, using a master equation approach.

Contribution

It demonstrates the potential for high polarization entanglement visibility in photon pairs emitted by a quantum dot in a microcavity, highlighting the quantum regime at low pumping rates.

Findings

Quantum regime occurs at low pumping and high emission rates.

High polarization entanglement visibility achievable through post-selection.

Emission spectrum and efficiency depend on excitation conditions.

Abstract

We study the photon emission from a quantum dot embedded in a microcavity. Incoherent pumping of its excitons and biexciton provokes the emission of leaky and cavity modes. By solving a master equation we obtain the correlation functions required to compute the spectrum and the relative efficiency among the emission of pairs and single photons. A quantum regime appears for low pumping and large rate of emission. By means of a post-selection process, a two beams experiment with different linear polarizations could be performed producing a large polarization entanglement visibility precisely in the quantum regime.