Related Experiment Video
Updated: Jul 16, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
Fast initialization of the spin state of an electron in a quantum dot in the Voigt configuration
C Emary1, Xiaodong Xu, D G Steel
1Department of Physics, The University of California-San Diego, La Jolla, California 92093, USA.
Abstract:
We consider the initialization of the spin state of a single electron trapped in a self-assembled quantum dot via optical pumping of a trion level. We show that with a magnetic field applied perpendicular to the growth direction of the dot, a near-unity fidelity can be obtained in a time equal to a few times the inverse of the spin-conserving trion relaxation rate. This method is several orders of magnitude faster than with the field aligned parallel, since this configuration must rely on a slow hole spin-flip mechanism. This increase in speed does result in a limit on the maximum obtainable fidelity, but we show that for InAs dots, the error is very small.
Related Concept Videos
Atomic Nuclei: Nuclear Spin State Overview
The Pauli Exclusion Principle
Spin–Spin Coupling Constant: Overview
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
Atomic Nuclei: Nuclear Relaxation Processes
Valence Bond Theory
Atomic Nuclei: Nuclear Spin State Population Distribution

