Quasiresonant Excitation of InP/InGaP Quantum Dots Using Second Harmonic Generated in a Photonic Crystal Cavity

TL;DR

This paper demonstrates a novel method for exciting InP/InGaP quantum dots using second harmonic generation in a photonic crystal cavity, enhancing quantum dot excitation efficiency for quantum information applications.

Contribution

It introduces a new quasiresonant excitation technique utilizing second harmonic generation in a photonic crystal cavity for InP/InGaP quantum dots.

Findings

High signal-to-noise ratio in quantum dot excitation

Effective second harmonic generation using InGaP nonlinearity

Potential for improved quantum information processing

Abstract

Indistinguishable single photons are necessary for quantum information processing applications. Resonant or quasiresonant excitation of single quantum dots provides greater single photon indistinguishability than incoherent pumping, but is also more challenging experimentally. Here, we demonstrate high signal to noise quasiresonant excitation of InP/InGaP quantum dots. The excitation is provided via second harmonic generated from a telecommunications wavelength laser resonant with the fundamental mode of a photonic crystal cavity, fabricated at twice the quantum dot transition wavelength. The second harmonic is generated using the \chi(2) nonlinearity of the InGaP material matrix.