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Optical spin locking of a solid-state qubit

Accepted version
Peer-reviewed

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Authors

Stockill, R 
Denning, EV 
Éthier-Majcher, G 

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% pi-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

quant-ph, quant-ph, cond-mat.mes-hall

Journal Title

npj Quantum Information

Conference Name

Journal ISSN

2056-6387
2056-6387

Volume Title

5

Publisher

Springer Science and Business Media LLC
Sponsorship
Engineering and Physical Sciences Research Council (EP/M013243/1)
European Research Council (617985)
EPSRC (1948685)
This work was supported by the ERC PHOENICS grant (617985), the EPSRC Quantum Technology Hub NQIT (EP/M013243/1) and the Royal Society (RGF/EA/181068). D.A.G. acknowledges support from St John’s College Title A Fellowship. E.V.D. acknowledges funding from the Danish Council for Independent Research (Grant No. DFF- 4181-00416). C.L.G. acknowledges support from a Royal Society Dorothy Hodgkin Fellowship.