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Landau-Zener-Stückelberg Interferometry for Majorana Qubit

Stimulated by a recent experiment observing successfully two superconducting states with even- and odd-number of electrons in a nanowire topological superconductor as expected from the existence of two end Majorana quasiparticles (MQs) [Albrecht et al., Nature 531, 206 (2016)], we propose a way to m...

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Autores principales: Wang, Zhi, Huang, Wen-Chao, Liang, Qi-Feng, Hu, Xiao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5962612/
https://www.ncbi.nlm.nih.gov/pubmed/29785030
http://dx.doi.org/10.1038/s41598-018-26324-5
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author Wang, Zhi
Huang, Wen-Chao
Liang, Qi-Feng
Hu, Xiao
author_facet Wang, Zhi
Huang, Wen-Chao
Liang, Qi-Feng
Hu, Xiao
author_sort Wang, Zhi
collection PubMed
description Stimulated by a recent experiment observing successfully two superconducting states with even- and odd-number of electrons in a nanowire topological superconductor as expected from the existence of two end Majorana quasiparticles (MQs) [Albrecht et al., Nature 531, 206 (2016)], we propose a way to manipulate Majorana qubit exploiting quantum tunneling effects. The prototype setup consists of two one-dimensional (1D) topological superconductors coupled by a tunneling junction which can be controlled by gate voltage. We show that the time evolution of superconducting phase difference at the junction under a voltage bias induces an oscillation in energy levels of the Majorana parity states, whereas the level-crossing is avoided by a small coupling energy of MQs in the individual 1D superconductors. This results in a Landau-Zener-Stückelberg (LZS) interference between the Majorana parity states. Adjusting pulses of bias voltage and gate voltage, one can construct a LZS interferometry which provides an arbitrary manipulation of the Majorana qubit.
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spelling pubmed-59626122018-05-24 Landau-Zener-Stückelberg Interferometry for Majorana Qubit Wang, Zhi Huang, Wen-Chao Liang, Qi-Feng Hu, Xiao Sci Rep Article Stimulated by a recent experiment observing successfully two superconducting states with even- and odd-number of electrons in a nanowire topological superconductor as expected from the existence of two end Majorana quasiparticles (MQs) [Albrecht et al., Nature 531, 206 (2016)], we propose a way to manipulate Majorana qubit exploiting quantum tunneling effects. The prototype setup consists of two one-dimensional (1D) topological superconductors coupled by a tunneling junction which can be controlled by gate voltage. We show that the time evolution of superconducting phase difference at the junction under a voltage bias induces an oscillation in energy levels of the Majorana parity states, whereas the level-crossing is avoided by a small coupling energy of MQs in the individual 1D superconductors. This results in a Landau-Zener-Stückelberg (LZS) interference between the Majorana parity states. Adjusting pulses of bias voltage and gate voltage, one can construct a LZS interferometry which provides an arbitrary manipulation of the Majorana qubit. Nature Publishing Group UK 2018-05-21 /pmc/articles/PMC5962612/ /pubmed/29785030 http://dx.doi.org/10.1038/s41598-018-26324-5 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Wang, Zhi
Huang, Wen-Chao
Liang, Qi-Feng
Hu, Xiao
Landau-Zener-Stückelberg Interferometry for Majorana Qubit
title Landau-Zener-Stückelberg Interferometry for Majorana Qubit
title_full Landau-Zener-Stückelberg Interferometry for Majorana Qubit
title_fullStr Landau-Zener-Stückelberg Interferometry for Majorana Qubit
title_full_unstemmed Landau-Zener-Stückelberg Interferometry for Majorana Qubit
title_short Landau-Zener-Stückelberg Interferometry for Majorana Qubit
title_sort landau-zener-stückelberg interferometry for majorana qubit
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5962612/
https://www.ncbi.nlm.nih.gov/pubmed/29785030
http://dx.doi.org/10.1038/s41598-018-26324-5
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