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Influence of the dispersion coefficient and dielectric constant ratio on the asymmetric Gaussian potential quantum dot qubit with electromagnetic field

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Abstract

Selecting the asymmetric Gaussian (AG) potential to describe the confinement of electron in a disk-shaped quantum dot (QD), the ground state and the first excited state energy and wave function of the system are derived by using the Lee\(\hbox {--}\)Low\(\hbox {--}\)Pines (LLP) Pekar transformation variational method, and the two-level structure required for a qubit is constructed. The influence of material parameters such as the dispersion coefficient, dielectric constant ratio and electron\(\hbox {--}\)phonon coupling constant on the qubit properties of AG potential QD with the electromagnetic field are investigated. The results show that the electric field and magnetic field have opposite adjustment functions for the formation of qubit. The electric field is advantageous for the qubit survival and information storage, while magnetic field and electron\(\hbox {--}\)phonon coupling are detrimental to the qubit survival and information storage, respectively. The decoherence time of the qubit increases with increasing magnetic field cyclotron frequency ‘from the turning point’. Applying an electric field, increasing the dielectric constant ratio, the dispersion coefficient and the electron\(\hbox {--}\)phonon coupling constant of the materials are all beneficial to improve the coherence of the qubit.

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Acknowledgements

This work was supported by National Natural Science Foundation of China under Grand No. 51902085 and the Natural Science Foundation of Inner Mongolia Autonomous Region, China under Grant No. 2019MS01011 and Grant No. 2019MS06017.

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Authors and Affiliations

  1. College of Mathematics and Physics, Inner Mongolia University for Nationalities, Tongliao, 028043, China

    Wuyunqimuge

  2. Department of Physic, Hebei Normal University of Science and Technology, Qinhuangdao, 066004, China

    Wei Xin, Xiao-Xu Liu &  Eerdunchaolu

Authors
  1. Wuyunqimuge
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  2. Wei Xin
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  3. Xiao-Xu Liu
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  4. Eerdunchaolu
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Correspondence to Wei Xin.

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Wuyunqimuge, Xin, W., Liu, XX. et al. Influence of the dispersion coefficient and dielectric constant ratio on the asymmetric Gaussian potential quantum dot qubit with electromagnetic field. Pramana - J Phys 94, 98 (2020). https://doi.org/10.1007/s12043-020-01963-4

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  • DOI: https://doi.org/10.1007/s12043-020-01963-4

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