Coherent spectroscopy of a single Mn-doped InGaAs quantum dot

TL;DR

This paper demonstrates coherent optical spectroscopy of a Mn-doped InGaAs quantum dot, revealing quantum interference and Autler-Townes splitting, highlighting its potential for quantum photonics despite inhomogeneous broadening.

Contribution

It provides the first coherent optical spectroscopy of a single Mn-doped quantum dot, analyzing quantum interference effects and dephasing in a V-like three-level system.

Findings

Autler-Townes splitting observed under resonant Raman and probe absorption.

Evidence of quantum interference within the V-like system.

Assessment of pure dephasing rate between spin states.

Abstract

Doping a self-assembled InGaAs/GaAs quantum dot (QD) with a single Mn atom, a magnetic acceptor impurity, provides a quantum system with discrete energy levels and original spin-dependent optical selection rules, which thus has large potential in quantum photonics, notably as a source of multi-entangled photons. To investigate this potential further, we perform coherent optical spectroscopy under continuous wave excitation of the 3-level V-like system formed in such a Mn-doped QD when charged by a single hole. In spite of a large inhomogeneous broadening of the optical transitions, we demonstrate Autler-Townes splitting both by resonant Raman scattering and by probe absorption spectroscopy for different saturation powers. Analysing these data with a comprehensive model based on optical Bloch equations, we show evidence for quantum interference within the V-like system and assess the pure dephasing rate between the corresponding spin states.