Asymmetric Gaussian confinement potential and decoherence effect on polaron in quantum disk with electromagnetic field
College of Engineering, Inner Mongolia University for Nationalities, Tongliao, 028043, China
2 Department of Physic, Hebei Normal University of Science and Technology, Qinhuangdao, 066004, China
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Accepted: 7 March 2020
Published online: 23 March 2020
Selecting the asymmetric Gaussian potential to describe the electron that is confined in a quantum dot, the ground and first excited state energy and wave function of the system are derived by using the Pekar-type variational method, and the two-level structure required for a qubit is constructed. The influence of the electron–phonon (EP) coupling constant on the probability density of the electron in the superposition state and the period of the oscillation of a qubit with electromagnetic field are investigated. By studying the effect of the dispersion coefficient, the EP coupling constant and the electromagnetic field on the spontaneous emission rate of the LO phonon, the influence of material parameters and the electromagnetic field on the decoherence of the qubit in quantum dots is revealed, and the theoretical scheme of suppressing the decoherence of qubit in quantum dots by phonon effect is enriched and perfected.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2020