Passive stabilization of hole spin qubit using optical Stark effect

TL;DR

This paper proposes using the optical Stark effect to passively stabilize hole spin qubits in quantum dots, significantly reducing dephasing caused by charge noise with less experimental complexity.

Contribution

It introduces a novel passive stabilization method leveraging the optical Stark effect to mitigate charge noise effects on hole spin qubits.

Findings

Achieves 10-100 fold reduction in extrinsic dephasing.

Demonstrates effectiveness using measured quantum dot parameters.

Offers a less complex alternative to active stabilization methods.

Abstract

The extrinsic dephasing of a hole spin confined to a self-assembled quantum dot is dominated by charge noise acting on an electric-field dependent g-factor. Here we propose the use of the optical Stark effect to reduce the sensitivity of the effective hole Zeeman energy to fluctuations in the local electric-field. Calculations using measured quantum dot parameters are presented, and demonstrate a factor of 10-100 reduction in the extrinsic dephasing. Compared to active stabilization methods, this technique should benefit from reduced experimental complexity.