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Optical spin locking of a solid-state qubit

Published version
Peer-reviewed

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Authors

Stockill, R. 
Denning, E. V. 
Éthier-Majcher, G. 

Abstract

Abstract: Quantum control of solid-state spin qubits typically involves pulses in the microwave domain, drawing from the well-developed toolbox of magnetic resonance spectroscopy. Driving a solid-state spin by optical means offers a high-speed alternative, which in the presence of limited spin coherence makes it the preferred approach for high-fidelity quantum control. Bringing the full versatility of magnetic spin resonance to the optical domain requires full phase and amplitude control of the optical fields. Here, we imprint a programmable microwave sequence onto a laser field and perform electron spin resonance in a semiconductor quantum dot via a two-photon Raman process. We show that this approach yields full SU(2) spin control with over 98%π-rotation fidelity. We then demonstrate its versatility by implementing a particular multi-axis control sequence, known as spin locking. Combined with electron-nuclear Hartmann–Hahn resonances which we also report in this work, this sequence will enable efficient coherent transfer of a quantum state from the electron spin to the mesoscopic nuclear ensemble.

Description

Keywords

Article, /639/766/400/482, /639/766/483/2802, /639/301/119/1000/1017, article

Journal Title

npj Quantum Information

Conference Name

Journal ISSN

2056-6387

Volume Title

5

Publisher

Nature Publishing Group UK