Coherent control of a single electron spin with electric fields

TL;DR

This paper demonstrates the coherent electrical control of a single electron spin in a quantum dot, achieving fast Rabi oscillations mediated by spin-orbit interaction, advancing spin qubit manipulation for quantum computing.

Contribution

It experimentally shows electrically driven coherent control of a single electron spin in a quantum dot, enabling fully electrical spin qubit manipulation.

Findings

Achieved ~55 ns pi/2 spin rotations using electric fields.

Confirmed spin-orbit interaction mediates electrically-induced spin transitions.

Supports feasibility of all-electrical spin qubit control.

Abstract

Manipulation of single spins is essential for spin-based quantum information processing. Electrical control instead of magnetic control is particularly appealing for this purpose, since electric fields are easy to generate locally on-chip. We experimentally realize coherent control of a single electron spin in a quantum dot using an oscillating electric field generated by a local gate. The electric field induces coherent transitions (Rabi oscillations) between spin-up and spin-down with pi/2 rotations as fast as ~55ns. Our analysis indicates that the electrically-induced spin transitions are mediated by the spin-orbit interaction. Taken together with the recently demonstrated coherent exchange of two neighboring spins, our results demonstrate the feasibility of fully electrical manipulation of spin qubits.