Highly efficient two photon generation from a coherently pumped quantum dot embedded in a microcavity

TL;DR

This paper presents a scheme for a highly efficient solid-state photon pair source using a coherently pumped quantum dot in a microcavity, leveraging cavity-assisted STIRAP and strong coupling to enhance two-photon emission.

Contribution

It introduces a novel cavity-assisted STIRAP method in quantum dots for efficient two-photon generation, achieving over 80% efficiency under current experimental conditions.

Findings

Two-photon emission efficiency can exceed 80%.

Cavity damping enhances two-photon-resonant emission.

Spectrum and correlations of generated photon pairs are analyzed.

Abstract

We propose a scheme to realize a highly efficient solid state source of photon pairs using cavity-assisted stimulated Raman adiabatic passage (STIRAP) in a single quantum dot, where a single photon from pump pulse and two stokes photons from cavity mode drives the Raman transition. The Autler-Townes doublet, generated by using a resonant continuous wave laser between biexciton and exciton states, and two-photon-resonant transition through strongly coupled cavity mode are utilized to facilitate (1+2)type Raman transition in the quantum dot. We show in the case of weak pump although the probability of generating two photons in cavity mode is small without cavity damping but two-photon-resonant emission is enhanced by cavity damping within strong coupling regime. We also discuss spectrum of the generated photon pair and photon-photon correlations in the generated photon pair. The efficiency of two photon source could be more than 80\% in current experimental conditions.