Ultrafast electric control of cavity mediated single-photon and photon-pair generation with semiconductor quantum dots

TL;DR

This paper presents a new ultrafast control method for semiconductor quantum dots in cavities to generate highly indistinguishable single photons and entangled photon pairs on demand, with realistic predictions considering losses and dephasing.

Contribution

It introduces a novel ultrafast control scheme using the quantum-confined Stark effect for on-demand photon and photon-pair emission from quantum dots.

Findings

Achieves near-perfect indistinguishability of single photons.

Generates photon pairs with near-ideal entanglement.

Provides realistic theoretical predictions including losses and dephasing.

Abstract

Employing the ultrafast control of electronic states of a semiconductor quantum dot in a cavity, we introduce a novel approach to achieve on-demand emission of single photons with almost perfect indistinguishability and photon pairs with near ideal entanglement. Our scheme is based on optical excitation off-resonant to a cavity mode followed by ultrafast control of the electronic states using the time-dependent quantum-confined Stark effect, which then allows for cavity-resonant emission. Our theoretical analysis takes into account cavity-loss mechanisms, the Stark effect, and phonon-induced dephasing allowing realistic predictions for finite temperatures.