Spin-Orbit Mediated Control of Spin Qubits

TL;DR

This paper explores using spin-orbit interaction to control electron spin qubits in quantum dots, enabling fast single and two-qubit operations with improved robustness against electrical noise.

Contribution

It introduces a novel control scheme leveraging spin-orbit coupling for quantum dot qubits, enhancing speed and noise resilience.

Findings

Fast single qubit operations via electron displacement

Two qubit gates based on spin-orbit and Coulomb interaction

Reduced sensitivity to electrical fluctuations compared to exchange-based methods

Abstract

We propose to use the spin-orbit interaction as a means to control electron spins in quantum dots, enabling both single qubit and two qubit operations. Very fast single qubit operations may be achieved by temporarily displacing the electrons. For two qubit operations the coupling mechanism is based on a combination of the spin-orbit coupling and the mutual long-ranged Coulomb interaction. Compared to existing schemes using the exchange coupling, the spin-orbit induced coupling is less sensitive to random electrical fluctuations in the electrodes defining the quantum dots.