The influence of electric field on a parabolic quantum dot qubit |
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Authors: | Yin Ji-Wen Xiao Jing-Lin Yu Yi-Fu and Wang Zi-Wu |
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Institution: | Department of Physic and Electronic Information Engineering, Chifeng College, Chifeng 024000, China; College of Physics and Electronic Information Inner Mongolia Normal University, Tongliao 028043, China |
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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. |
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Keywords: | quantum dot quantum
information qubit |
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