Photon Number Coherence of a Quantum Dot-Cavity System Excited Using the SUPER Scheme

TL;DR

This paper demonstrates that the SUPER excitation scheme reduces photon number coherence in quantum dot-cavity systems by inducing a Stark shift that decouples the quantum dot from the cavity, enhancing single-photon source properties.

Contribution

It introduces the use of the SUPER scheme to decrease photon number coherence in quantum dot-cavity systems, accounting for environmental effects.

Findings

SUPER scheme significantly decreases PNC compared to resonant excitation

Laser-induced Stark shift decouples QD from cavity during SUPER excitation

Calculations include phonons and radiative losses effects

Abstract

To fulfill the security requirements of quantum cryptography, photon number coherence (PNC) of single photon sources has recently become an important figure of merit. Quantum dots (QDs) embedded in photonic microcavities offer a mature source of single photons, of which many properties can be tuned by the use of different excitation protocols or parameters. We show that the Swing-UP of quantum EmitteR population (SUPER) scheme can significantly decrease the PNC of the emitted photon, compared to resonant excitation. The reason for this is a laser-induced Stark shift, which effectively decouples the QD from the cavity during the SUPER excitation. Our calculations account for environmental effects such as phonons and radiative losses.