Tunable single photon and two-photon emission in a four-level quantum dot-bimodal cavity system

TL;DR

This paper demonstrates tunable single-photon and two-photon emission in a four-level quantum dot coupled to a bimodal cavity, with control over photon statistics via laser parameters.

Contribution

It introduces a method to generate both single photons and photon pairs in a controllable manner using a four-level quantum dot system with a bimodal cavity.

Findings

Single photon emission characterized by g^2(0)~0.15.

Photon pair emission with Mandel Q parameter~0.04.

Large mean cavity photon number (~0.1) maintained in both cases.

Abstract

We investigate the generation of single photons and photon pairs in a cavity quantum electrodynamics system of a four-level quantum dot coupled to bimodal cavity. By tuning frequencies and intensity ratio of the driving lasers, sub-Poissonian and super-Poissonian photon statistics are obtained in each nondegenerate cavity mode respectively. Single photon emission is characterized as zero-delay second-order correlation function g^2(0)~0.15. Photon pair emission under the two-photon resonance excitation is quantified by Mandel parameter as Q~0.04. The mean cavity photon number in both scenarios can maintain large around 0.1. As a result, single photon emission and two-photon emission can be integrated in our proposed system only by tuning the external parameters of the driving lasers.