Optical pumping and non-destructive readout of a single magnetic impurity spin in an InAs/GaAs quantum dot

TL;DR

This paper demonstrates resonant optical pumping and non-destructive readout of a single magnetic impurity spin in an InAs/GaAs quantum dot, enabling precise spin state control and measurement.

Contribution

It introduces a novel method for optical pumping and non-destructive readout of a single Mn impurity spin in a quantum dot using a resonant excitation scheme.

Findings

Achieved spin polarization near or above 50%.

Demonstrated non-destructive readout via photoluminescence.

Controlled spin states using a magnetic field and resonant excitation.

Abstract

We report on the resonant optical pumping of the |\pm1> spin states of a single Mn dopant in an InAs/GaAs quantum dot embedded itself in a charge tuneable device. The experiment relies on a "W" scheme of transitions reached when a suitable longitudinal magnetic field is applied. The optical pumping is achieved via the resonant excitation of the central {\Lambda} system at the neutral exciton X0 energy. For a specific gate voltage, the red-shifted photoluminescence of the charged exciton X- is observed, which allows non-destructive readout of the spin polarization. An arbitrary spin preparation in the |+1> or |-1> state characterized by a polarization near or above 50% is evidenced.