Single-qubit gates and measurements in the surface acoustic wave quantum computer

S. Furuta, C. H. W. Barnes, and C. J. L. Doran
Phys. Rev. B 70, 205320 – Published 15 November 2004

Abstract

In the surface acoustic wave quantum computer, the spin state of an electron trapped in a moving quantum dot comprises the physical qubit of the scheme. Via detailed analytic and numerical modeling of the qubit dynamics, we discuss the effect of excitations into higher-energy orbital states of the quantum dot that occur when the qubits pass through magnetic fields. We describe how single-qubit quantum operations, such as single-qubit rotations and single-qubit measurements, can be performed using only localized static magnetic fields. The models provide useful parameter regimes to be explored experimentally when the requirements on semiconductor gate fabrication and the nanomagnetics technology are met in the future.

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  • Received 11 February 2004

DOI:https://doi.org/10.1103/PhysRevB.70.205320

©2004 American Physical Society

Authors & Affiliations

S. Furuta*, C. H. W. Barnes, and C. J. L. Doran

  • Cavendish Laboratory, Department of Physics, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom

  • *Also affiliated with Centre for Quantum Computation, Department of Applied Mathematics and Theoretical Physics, Wilberforce Road, Cambridge CB3 0WA, UK. Electronic address: suguru.furuta@qubit.org

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Vol. 70, Iss. 20 — 15 November 2004

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