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

Abstract

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.

V2: Revised to add a reference to simultaneous related work (arXiv:1309.6424)

References in corpus (8)

• High-fidelity projective readout of a solid-state spin quantum register
• Quantum error correction in a solid-state hybrid spin register
• Decoherence-protected quantum gates for a hybrid solid-state spin register
• Detection and control of individual nuclear spins using a weakly coupled electron spin
• Topological quantum computing with a very noisy network and local error rates approaching one percent
• Electron spin decoherence of single Nitrogen-Vacancy defects in diamond
• Demonstration of entanglement-by-measurement of solid state qubits
• Universal Control of Nuclear Spins Via Anisotropic Hyperfine Interactions

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