Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot

Jan Fischer, W. A. Coish, D. V. Bulaev, and Daniel Loss
Phys. Rev. B 78, 155329 – Published 31 October 2008

Abstract

We theoretically study the interaction of a heavy hole with nuclear spins in a quasi-two-dimensional III–V semiconductor quantum dot and the resulting dephasing of heavy-hole spin states. It has frequently been stated in the literature that heavy holes have a negligible interaction with nuclear spins. We show that this is not the case. In contrast, the interaction can be rather strong and will be the dominant source of decoherence in some cases. We also show that for unstrained quantum dots the form of the interaction is Ising, resulting in unique and interesting decoherence properties, which might provide a crucial advantage to using dot-confined hole spins for quantum information processing, as compared to electron spins.

  • Figure
  • Received 30 September 2008

DOI:https://doi.org/10.1103/PhysRevB.78.155329

©2008 American Physical Society

Authors & Affiliations

Jan Fischer1, W. A. Coish1,2, D. V. Bulaev1,3, and Daniel Loss1

  • 1Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
  • 2Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, 200 University Avenue W., Waterloo, Ontario, Canada N2L 3G1
  • 3Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow District, Russia

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Issue

Vol. 78, Iss. 15 — 15 October 2008

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