Surface code architecture for donors and dots in silicon with imprecise and nonuniform qubit couplings

G. Pica, B. W. Lovett, R. N. Bhatt, T. Schenkel, S. A. Lyon

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

A scaled quantum computer with donor spins in silicon would benefit from a viable semiconductor framework and a strong inherent decoupling of the qubits from the noisy environment. Coupling neighboring spins via the natural exchange interaction according to current designs requires gate control structures with extremely small length scales. We present a silicon architecture where bismuth donors with long coherence times are coupled to electrons that can shuttle between adjacent quantum dots, thus relaxing the pitch requirements and allowing space between donors for classical control devices. An adiabatic SWAP operation within each donor/dot pair solves the scalability issues intrinsic to exchange-based two-qubit gates, as it does not rely on subnanometer precision in donor placement and is robust against noise in the control fields. We use this SWAP together with well established global microwave Rabi pulses and parallel electron shuttling to construct a surface code that needs minimal, feasible local control.

Original languageEnglish (US)
Article number035306
JournalPhysical Review B
Volume93
Issue number3
DOIs
StatePublished - Jan 14 2016

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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