Ultrafast single electron spin manipulation in 2D semiconductor quantum dots with optimally controlled time-dependent electric fields through spin-orbit coupling

TL;DR

This paper proposes a theoretical method for ultrafast single electron spin control in 2D semiconductor quantum dots using optimally shaped electric fields, enabling picosecond-scale spin operations for quantum computing.

Contribution

It introduces a quantum optimal control approach to manipulate electron spins via spin-orbit coupling with high temporal precision in 2D quantum dots.

Findings

Achieves spin manipulation within picoseconds.

Demonstrates control effectiveness with tailored electric fields.

Suggests potential for quantum information processing applications.

Abstract

We have studied theoretically the possibility of ultra-fast manipulation of a single electron spin in 2D semiconductor quantum dots, by means of high-frequency time-dependent electric fields. The electron spin degree of freedom is excited through spin-orbit coupling, and the procedure may be enhanced by the presence of a static magnetic field. We use quantum optimal control theory to tailor the temporal profile of the electric field in order to achieve the most effective manipulation. The scheme predicts significant control over spin operations in times of the order of picoseconds -- an ultrafast time scale that permits to avoid the effects of decoherence if this scheme is to be used as a tool for quantum information processing.