Enhanced Two-Photon Processes in Quantum Dots inside Photonic Crystal Nanocavities and Quantum Information Processing Applications

TL;DR

This paper demonstrates significant enhancement of two-photon processes in quantum dots within photonic crystal nanocavities, enabling advanced quantum information applications like entangled photon generation and telecom single-photon sources.

Contribution

It introduces a method to greatly enhance two-photon transition rates in quantum dots using nanocavities, facilitating new quantum information processing techniques.

Findings

Two-photon transition rates are increased by up to 8 orders of magnitude.

Enhanced processes enable efficient quantum dot excitation and photon pair generation.

Potential for telecom wavelength single-photon sources.

Abstract

We show that the two-photon transition rates of quantum dots coupled to nanocavities are enhanced by up to 8 orders of magnitude relative to quantum dots in bulk host. We then propose how to take advantage of this enhancement to implement coherent quantum dot excitation by two-photon absorption, entangled photon pair generation by two-photon spontaneous emission, and single-photon generation at telecommunication wavelengths by two-photon stimulated and spontaneous emission.