Coherent Single Electron Spin Control in a Slanting Zeeman Field

Yasuhiro Tokura, Wilfred G. van der Wiel, Toshiaki Obata, and Seigo Tarucha
Phys. Rev. Lett. 96, 047202 – Published 30 January 2006

Abstract

We consider a single electron in a 1D quantum dot with a static slanting Zeeman field. By combining the spin and orbital degrees of freedom of the electron, an effective quantum two-level (qubit) system is defined. This pseudospin can be coherently manipulated by the voltage applied to the gate electrodes, without the need for an external time-dependent magnetic field or spin-orbit coupling. Single-qubit rotations and the controlled-NOT operation can be realized. We estimated the relaxation (T1) and coherence (T2) times and the (tunable) quality factor. This scheme implies important experimental advantages for single electron spin control.

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  • Received 14 October 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.047202

©2006 American Physical Society

Authors & Affiliations

Yasuhiro Tokura1,2, Wilfred G. van der Wiel3, Toshiaki Obata2, and Seigo Tarucha2,4

  • 1NTT Basic Research Laboratories, NTT Corporation, Atsugi-shi, Kanagawa 243-0198, Japan
  • 2Quantum Spin Information Project, ICORP, JST, Atsugi-shi, Kanagawa 243-0198, Japan
  • 3SRO NanoElectronics, MESA+ Institute for NanoTechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands, and PRESTO-JST, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • 4Department of Applied Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

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Issue

Vol. 96, Iss. 4 — 3 February 2006

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