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Signatures of atomic-scale structure in the energy dispersion and coherence of a Si quantum-dot qubit

J. C. Abadillo-Uriel, Brandur Thorgrimsson, Dohun Kim, L. W. Smith, C. B. Simmons, Daniel R. Ward, Ryan H. Foote, J. Corrigan, D. E. Savage, M. G. Lagally, M. J. Calderón, S. N. Coppersmith, M. A. Eriksson, and Mark Friesen
Phys. Rev. B 98, 165438 – Published 29 October 2018

Abstract

We report anomalous behavior in the energy dispersion of a three-electron double-quantum-dot hybrid qubit and argue that it is caused by atomic-scale disorder at the quantum-well interface. By employing tight-binding simulations, we identify potential disorder profiles that induce behavior consistent with the experiments. The results indicate that disorder can give rise to “sweet spots” where the decoherence caused by charge noise is suppressed, even in a parameter regime where true sweet spots are unexpected. Conversely, “hot spots” where the decoherence is enhanced can also occur. Our results suggest that interfacial atomic structure can be used in particular cases as a tool to enhance the fidelity of Si double-dot qubits.

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  • Received 26 June 2018
  • Revised 9 October 2018

DOI:https://doi.org/10.1103/PhysRevB.98.165438

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsQuantum Information, Science & Technology

Authors & Affiliations

J. C. Abadillo-Uriel1,2, Brandur Thorgrimsson2, Dohun Kim3, L. W. Smith2,*, C. B. Simmons2, Daniel R. Ward2, Ryan H. Foote2, J. Corrigan2, D. E. Savage4, M. G. Lagally4, M. J. Calderón1, S. N. Coppersmith2, M. A. Eriksson2, and Mark Friesen2

  • 1Materials Science Factory, Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC), Sor Juana Ines de la Cruz 3, 28049 Madrid, Spain
  • 2Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
  • 3Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 08826, South Korea
  • 4Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA

  • *Present address: Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom.

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Issue

Vol. 98, Iss. 16 — 15 October 2018

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