The effect of electric field on an asymmetric quantum dot qubit

The effect of electric field on an asymmetric quantum dot qubit On the condition of strong electron–LO phonon coupling in an asymmetric quantum dot (QD), we study the eigenenergies and eigenfunctions of the ground and the first excited states under an applied electric field by using variational method of Pekar type. This QD system may be used as a two-level qubit. When the electron is in the superposition state of the ground and the first excited states, we obtain the time evolution of the electron probability density, which oscillates in the QD. It is found that due to the presence of the 3-D anisotropic harmonic potentials in the transverse and longitudinal directions of the QD, the electron probability density shows double-peak configuration, whereas there is only one peak if the confinement is 2-D symmetric in the x- and y-directions. The oscillation period is an increasing function of the transverse and longitudinal effective confinement lengths of the QD, and decreases with respect to the electron–phonon coupling strength and the electric field. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

The effect of electric field on an asymmetric quantum dot qubit

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Publisher
Springer US
Copyright
Copyright © 2013 by Springer Science+Business Media New York
Subject
Physics; Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics
ISSN
1570-0755
eISSN
1573-1332
D.O.I.
10.1007/s11128-013-0631-8
Publisher site
See Article on Publisher Site

Abstract

On the condition of strong electron–LO phonon coupling in an asymmetric quantum dot (QD), we study the eigenenergies and eigenfunctions of the ground and the first excited states under an applied electric field by using variational method of Pekar type. This QD system may be used as a two-level qubit. When the electron is in the superposition state of the ground and the first excited states, we obtain the time evolution of the electron probability density, which oscillates in the QD. It is found that due to the presence of the 3-D anisotropic harmonic potentials in the transverse and longitudinal directions of the QD, the electron probability density shows double-peak configuration, whereas there is only one peak if the confinement is 2-D symmetric in the x- and y-directions. The oscillation period is an increasing function of the transverse and longitudinal effective confinement lengths of the QD, and decreases with respect to the electron–phonon coupling strength and the electric field.

Journal

Quantum Information ProcessingSpringer Journals

Published: Aug 25, 2013

References

  • Spin-polarized transport through an Aharonov–Bohm interferometer with Rashba spin-orbit interaction
    Chi, F; Li, SS
  • InAs/GaAs single-electron quantum dot qubit
    Lis, SS; Xia, JB; Liu, JL; Yang, FH; Niu, ZC; Feng, SL; Zheng, HZ
  • Quantum computation with quantum dots
    Loss, D; DiVincenzo, DP

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