Long-distance entanglement of soliton spin qubits in gated nanowires

Paweł Szumniak, Jarosław Pawłowski, Stanisław Bednarek, and Daniel Loss
Phys. Rev. B 92, 035403 – Published 2 July 2015

Abstract

We investigate numerically the charge, spin, and entanglement dynamics of two electrons confined in a gated semiconductor nanowire. The electrostatic coupling between electrons in the nanowire and the induced charge on the metal electrodes leads to a self-trapping of the electrons, which results in solitonlike properties. We show that the interplay of an all-electrically controlled coherent transport of the electron solitons and of the exchange interaction can be used to realize ultrafast SWAP and entangling SWAP gates for distant spin qubits. We demonstrate that the latter gate can be used to generate a maximally entangled spin state of spatially separated electrons. The results are obtained by quantum-mechanical time-dependent calculations with exact inclusion of electron-electron correlations.

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  • Received 15 January 2015
  • Revised 4 June 2015

DOI:https://doi.org/10.1103/PhysRevB.92.035403

©2015 American Physical Society

Authors & Affiliations

Paweł Szumniak1,2, Jarosław Pawłowski2, Stanisław Bednarek2, and Daniel Loss1

  • 1Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
  • 2AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, al. Mickiewicza 30, 30-059 Kraków, Poland

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Vol. 92, Iss. 3 — 15 July 2015

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