Qubit transformations on Rashba ring with periodic potential

Kregar, Ambrož (author), Ramšak, Anton (author)

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.

• Language: English
• Keywords: quantum mechanics, qubit transformations, quantum rings, Rashba coupling, periodic potential
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering; FMF - Faculty of Mathematics and Physics
• Publication status: Published
• Publication version: Version of Record
• Year: 2020
• Number of pages: 15 str.
• Numbering: Vol. 22, no. 8, art. 083048
• PID: 20.500.12556/RUL-128560
• UDC: 530.145
• ISSN on article: 1367-2630
• DOI: 10.1088/1367-2630/aba462
• COBISS.SI-ID: 25663491
• Publication date in RUL: 19.07.2021

Record is a part of a journal

• Title: New journal of physics
• Publisher: Institute of Physics Publishing, Deutsche Physikalische Gesellschaft
• ISSN: 1367-2630
• COBISS.SI-ID: 21135621

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 18.08.2020

Secondary language

• Language: Slovenian
• Keywords: kvantna mehanika, kubitne transformacije, kvantni obroči, Rashbova sklopitev, periodični potencial

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P1-0044
• Name: Teorija trdnih snovi in statistična fizika