Optically-gated resonant emission in single quantum dots

TL;DR

This paper demonstrates that an ultra-weak non-resonant laser can act as an optical gate for single quantum dots, enabling ideal two-level system behavior by suppressing Coulomb blockade.

Contribution

It introduces a novel optical gating technique using a weak laser to control resonant emission in quantum dots, revealing new ways to manipulate quantum dot states.

Findings

Weak non-resonant laser suppresses Coulomb blockade

Quantum dots behave as ideal two-level systems

Optical gating enables control of resonant emission

Abstract

We report on the resonant emission in coherently-driven single semiconductor quantum dots. We demonstrate that an ultra-weak non-resonant laser acts as an optical gate for the quantum dot resonant response. We show that the gate laser suppresses Coulomb blockade at the origin of a resonant emission quenching, and that the optically-gated quantum dots systematically behave as ideal two-level systems in both regimes of coherent and incoherent resonant emission.