中国物理B ›› 2009, Vol. 18 ›› Issue (2): 446-450.doi: 10.1088/1674-1056/18/2/012

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The influence of electric field on a parabolic quantum dot qubit

肖景林1, 尹辑文2, 于毅夫2, 王子武2   

  1. (1)College of Physics and Electronic Information Inner Mongolia Normal University, Tongliao 028043, China; (2)Department of Physic and Electronic Information Engineering, Chifeng College, Chifeng 024000, China
  • 收稿日期:2008-06-11 修回日期:2008-06-14 出版日期:2009-02-20 发布日期:2009-02-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10747002).

The influence of electric field on a parabolic quantum dot qubit

Yin Ji-Wen(尹辑文)a)†, Xiao Jing-Lin(肖景林)b), Yu Yi-Fu(于毅夫)a), and Wang Zi-Wu(王子武)a)   

  1. a Department of Physic and Electronic Information Engineering, Chifeng College, Chifeng 024000, China; b College of Physics and Electronic Information Inner Mongolia Normal University, Tongliao 028043, China
  • Received:2008-06-11 Revised:2008-06-14 Online:2009-02-20 Published:2009-02-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10747002).

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摘要： This paper calculates the time evolution of the quantum mechanical state of an electron by using variational method of Pekar type on the condition of electric--LO-phonon strong coupling in a parabolic quantum dot. It obtains the eigenenergies of the ground state and the first-excited state, the eigenfunctions of the ground state and the first-excited state This system in a quantum dot may be employed as a two-level quantum system qubit. The superposition state electron density oscillates in the quantum dot with a period when the electron is in the superposition state of the ground and the first-excited state. It studies the influence of the electric field on the eigenenergies of the ground state, the first-excited state and the period of oscillation at the different electron--LO-phonon coupling constant and the different confinement length.

关键词: quantum dot, quantum information, qubit

Abstract: This paper calculates the time evolution of the quantum mechanical state of an electron by using variational method of Pekar type on the condition of electric--LO-phonon strong coupling in a parabolic quantum dot. It obtains the eigenenergies of the ground state and the first-excited state, the eigenfunctions of the ground state and the first-excited state This system in a quantum dot may be employed as a two-level quantum system qubit. The superposition state electron density oscillates in the quantum dot with a period when the electron is in the superposition state of the ground and the first-excited state. It studies the influence of the electric field on the eigenenergies of the ground state, the first-excited state and the period of oscillation at the different electron--LO-phonon coupling constant and the different confinement length.

Key words: quantum dot, quantum information, qubit

中图分类号:  (Quantum dots)

  • 73.21.La
63.22.-m (Phonons or vibrational states in low-dimensional structures and nanoscale materials) 71.38.-k (Polarons and electron-phonon interactions) 03.67.Lx (Quantum computation architectures and implementations)