Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical spin locking of a solid-state qubit   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.

25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc