Qubit transformations on Rashba ring with periodic potential

Ambroz Kregar*, Anton Ramsak

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A spin-qubit transformation protocol is proposed for an electron in a mesoscopic quantum ring with tunable Rashba interaction controlled by the external electric field. The dynamics of an electron driven around the ring by a series of Landau-Zenner-like transitions between a finite number of local voltage gates is determined analytically. General single-qubit transformations are demonstrated to be feasible in a dynamical basis of localized pseudo-spin states. It is also demonstrated that by the use of suitable protocols based on changes of the Rashba interaction full Bloch sphere can be covered. The challenges of a possible realization of the proposed system in semiconductor heterostructures are discussed.

Original languageEnglish
Article number083048
JournalNew Journal of Physics
Issue number8
Publication statusPublished - Aug 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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