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Decoherence of Magneto-Bipolaron with Strong Coupling in a Quantum Dot Qubit Under Applied Electric Field

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Abstract

In this paper, we study the physical properties and decoherence of strong coupling magneto-bipolaron qubit in a quantum dot under the effect of an external electric field. The magneto-bipolaron energies of ground and first excited states are evaluated using the Pekar variational method. The decoherence time and entropy are also evaluated. All these calculations are intended to show firstly the effect of both the magnetic and the electric fields on the quasi-particles’ properties in the quantum dot. Our results show that all studied quasi-particles properties in the quantum dot are closely influenced by magnetic and electric fields. The decoherence time increases with increasing of the electric field strength, and decreases with increasing of the magnetic field strength and the electron–phonon coupling constant. From our analysis, it is obvious to see that the application of electric field and magnetic field have opposite effects on the qubit. Comparing both fields, the electric field is advantageous for qubit survival and information storage, while the magnetic field is detrimental to qubit survival and information storage, respectively. The entropy increases with increasing of the electric field strength, and decreases with increasing of the magnetic field strength. We also observe that in the absence of magnetic and electric fields, the entropy varies very slightly with the increase of the confinement strength. We can deduce that, these external fields can help us to modulate the period of information transfer in the system, and hence can be used to control its coherence.

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Acknowledgements

The authors thank the Intra-African Program for funding under ACADEMY project No 2017-3052/001-001, and the Theoretical Physics Laboratory of the University Abou Bekr Belkaid of Tlemcen (Algeria) for all the support. M. S. M is grateful to the Abdus Salam International Centre for theoretical Physics (ICTP) for its support through the OEA-AF-12 project. A.E.M. is grateful to DGRSDT and MHESR of Algeria for financial support under the PRFU research project N° B00L02UN130120180011.

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Authors and Affiliations

  1. Mesoscopic and Multilayers Structures Laboratory, Department of Physics, Faculty of Science, University of Dschang, P.O. Box 479, Dschang, Cameroon

    D. C. Ngoufack Guimapi & A. J. Fotue

  2. Center for Atomic, Molecular Physics and Quantum Optic, Faculty of Science, University of Douala, P.O. 8580, Douala, Cameroon

    M. Silenou Mengoue

  3. Solid State Physics Team, Theoretical Physics Laboratory, Faculty of Sciences, A Belkaid University, Box 119, 13000, Tlemcen, Algeria

    D. C. Ngoufack Guimapi & A. E. Merad

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  1. D. C. Ngoufack Guimapi
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  2. M. Silenou Mengoue
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  3. A. E. Merad
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  4. A. J. Fotue
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Correspondence to A. J. Fotue.

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Ngoufack Guimapi, D.C., Silenou Mengoue, M., Merad, A.E. et al. Decoherence of Magneto-Bipolaron with Strong Coupling in a Quantum Dot Qubit Under Applied Electric Field. J Low Temp Phys 205, 11–28 (2021). https://doi.org/10.1007/s10909-021-02612-9

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  • DOI: https://doi.org/10.1007/s10909-021-02612-9

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