Theory of Quantum Optical Control of Single Spin in a Quantum Dot

TL;DR

This paper develops a theoretical framework for controlling a single electron spin in a quantum dot using optical methods, enabling arbitrary spin rotations through Raman transitions with adiabatic pulses.

Contribution

It introduces a novel theoretical approach for quantum optical control of electron spins in quantum dots via spin-flip Raman transitions, including the use of adiabatic optical pulses.

Findings

Arbitrary spin rotations can be achieved through virtual excitation of trion states.

Adiabatic optical pulses effectively perform single qubit operations.

The theory addresses control in the presence of a static magnetic field.

Abstract

We present a theory of quantum optical control of an electron spin in a single semiconductor quantum dot via spin-flip Raman transitions. We show how an arbitrary spin rotation may be achieved by virtual excitation of discrete or continuum trion states. The basic physics issues of the appropriate adiabatic optical pulses in a static magnetic field to perform the single qubit operation are addressed.