Spontaneous two photon emission from a single quantum dot

TL;DR

This paper reports the observation of spontaneous two-photon emission from a single quantum dot coupled with a photonic crystal cavity, demonstrating enhanced two-photon emission and suppression of single-photon emission at resonance.

Contribution

It presents the first experimental demonstration of spontaneous two-photon emission from a solid-state quantum emitter in a nanocavity.

Findings

Enhanced two-photon emission observed at cavity resonance.

Suppression of single-photon emission from the biexciton.

Strong coupling between quantum dot and nanocavity demonstrated.

Abstract

Spontaneous two photon emission from a solid-state single quantum emitter is observed. We investigated photoluminescence from the neutral biexciton in a single semiconductor quantum dot coupled with a high Q photonic crystal nanocavity. When the cavity is resonant to the half energy of the biexciton, the strong vacuum field in the cavity inspires the biexciton to simultaneously emit two photons into the mode, resulting in clear emission enhancement of the mode. Meanwhile, suppression was observed of other single photon emission from the biexciton, as the two photon emission process becomes faster than the others at the resonance.