Universal control and error correction in multi-qubit spin registers in diamond

Quantum registers of nuclear spins coupled to electron spins of individual solid-state defects are a promising platform for quantum information processing. Pioneering experiments selected defects with favourably located nuclear spins having particularly strong hyperfine couplings. For progress towar...

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Bibliographic Details
Published in:arXiv.org 2013-09
Main Authors: Taminiau, T H, Cramer, J, van der Sar, T, Dobrovitski, V V, Hanson, R
Format: Article
Language:English
Subjects:
Coding
Couplings
Data processing
Defects
Diamonds
Electron spin
Error correction
Quantum computing
Quantum phenomena
Quantum theory
Qubits (quantum computing)
Registers
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Summary:Quantum registers of nuclear spins coupled to electron spins of individual solid-state defects are a promising platform for quantum information processing. Pioneering experiments selected defects with favourably located nuclear spins having particularly strong hyperfine couplings. For progress towards large-scale applications, larger and deterministically available nuclear registers are highly desirable. Here we realize universal control over multi-qubit spin registers by harnessing abundant weakly coupled nuclear spins. We use the electron spin of a nitrogen-vacancy centre in diamond to selectively initialize, control and read out carbon-13 spins in the surrounding spin bath and construct high-fidelity single- and two-qubit gates. We exploit these new capabilities to implement a three-qubit quantum-error-correction protocol and demonstrate the robustness of the encoded state against applied errors. These results transform weakly coupled nuclear spins from a source of decoherence into a reliable resource, paving the way towards extended quantum networks and surface-code quantum computing based on multi-qubit nodes.
ISSN:2331-8422
DOI:10.48550/arxiv.1309.5452