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A silicon-based surface code quantum computer

O'Gorman, J; Nickerson, NH; Ross, P; Morton, JJL; Benjamin, SC; (2016) A silicon-based surface code quantum computer. npj Quantum Information , 2 , Article 15019. 10.1038/npjqi.2015.19. Green open access

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Individual impurity atoms in silicon can make superb individual qubits, but it remains an immense challenge to build a multi-qubit processor: there is a basic conflict between nanometre separation desired for qubit–qubit interactions and the much larger scales that would enable control and addressing in a manufacturable and fault-tolerant architecture. Here we resolve this conflict by establishing the feasibility of surface code quantum computing using solid-state spins, or ‘data qubits’, that are widely separated from one another. We use a second set of ‘probe’ spins that are mechanically separate from the data qubits and move in and out of their proximity. The spin dipole–dipole interactions give rise to phase shifts; measuring a probe’s total phase reveals the collective parity of the data qubits along the probe’s path. Using a protocol that balances the systematic errors due to imperfect device fabrication, our detailed simulations show that substantial misalignments can be handled within fault-tolerant operations. We conclude that this simple ‘orbital probe’ architecture overcomes many of the difficulties facing solid-state quantum computing, while minimising the complexity and offering qubit densities that are several orders of magnitude greater than other systems.

Type: Article
Title: A silicon-based surface code quantum computer
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/npjqi.2015.19
Publisher version: http://doi.org/10.1038/npjqi.2015.19
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/ by/4.0/
Keywords: Science & Technology, Physical Sciences, Physics, Applied, Physics, Atomic, Molecular & Chemical, Physics, Condensed Matter, Physics, ELECTRON SPINS, NUCLEAR-SPIN, DIAMOND, STAGE, CARBIDE, DEVICE, MEMORY
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/1546219
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