Qubit coherence effects in a RbCl quantum well with asymmetric Gaussian confinement potential and applied electric field
Institute of Condensed Matter Physics, Inner Mongolia University for Nationalities, 028043, Tongliao, China
Accepted: 13 July 2020
Published online: 22 July 2020
We theoretically investigate the coherent time of a single qubit in a RbCl quantum well (QW) with asymmetric Gaussian confinement potential (AGCP) using the Pekar-type variational method. Additionally, we utilize Fermi’s golden rule to consider strong coupling between electrons and longitudinal optical phonons in the QW with an electric field applied. The results show that the coherence time changes with AGCP QW’s height, height of the QW, polaron radius and electric field. Moreover, we also show that the coherence time is minimized to in a confinement potential range . Thus we conclude that these tunable parameters of the QW are vital for adjusting the coherence time and deciding the stability of the qubit.
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