Fast long-distance control of spin qubits by photon-assisted cotunneling

Peter Stano, Jelena Klinovaja, Floris R. Braakman, Lieven M. K. Vandersypen, and Daniel Loss
Phys. Rev. B 92, 075302 – Published 4 August 2015

Abstract

We investigate theoretically the long-distance coupling and spin exchange in an array of quantum dot spin qubits in the presence of microwaves. We find that photon-assisted cotunneling is boosted at resonances between photon and energies of virtually occupied excited states and show how to make it spin selective. We identify configurations that enable fast switching and spin echo sequences for efficient and nonlocal manipulation of spin qubits. We devise configurations in which the near-resonantly boosted cotunneling provides nonlocal coupling which, up to certain limit, does not diminish with distance between the manipulated dots before it decays weakly with inverse distance.

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  • Received 16 September 2014
  • Revised 15 July 2015

DOI:https://doi.org/10.1103/PhysRevB.92.075302

©2015 American Physical Society

Authors & Affiliations

Peter Stano1,2, Jelena Klinovaja3, Floris R. Braakman3,4, Lieven M. K. Vandersypen4, and Daniel Loss1,3

  • 1RIKEN Center for Emergent Matter Science, Wako, Saitama, Japan
  • 2Institute of Physics, Slovak Academy of Sciences, 845 11 Bratislava, Slovakia
  • 3Department of Physics, Klingelbergstrasse 82, University of Basel, Switzerland
  • 4Kavli Institute of Nanoscience, TU Delft, 2600 GA Delft, The Netherlands

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Issue

Vol. 92, Iss. 7 — 15 August 2015

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