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)
aDepartment of Physic and Electronic Information Engineering, Chifeng College, Chifeng 024000, China; bCollege of Physics and Electronic Information Inner Mongolia Normal University, Tongliao 028043, China
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.
Received: 11 June 2008
Revised: 14 June 2008
Accepted manuscript online:
(Quantum computation architectures and implementations)
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10747002).
Cite this article:
Yin Ji-Wen(尹辑文), Xiao Jing-Lin(肖景林), Yu Yi-Fu(于毅夫), and Wang Zi-Wu(王子武) The influence of electric field on a parabolic quantum dot qubit 2009 Chin. Phys. B 18 446
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