Transparent qubit manipulations with spin-orbit coupled two-electron nanowire quantum dot

Abstract We report on the first set of exact orthonormalized states to an ac driven one-dimensional (1D) two-electron nanowire quantum dot with the Rashba–Dresselhaus coexisted spin-orbit coupling (SOC) and the controlled magnetic field orientation and trapping frequency. In the ground state case, i...

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Autores principales:	Kuo Hai, Yifan Wang, Qiong Chen, Wenhua Hai
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/78a2e47836b74c3c97039413e5e32397
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spelling	oai:doaj.org-article:78a2e47836b74c3c97039413e5e323972021-12-02T17:26:55ZTransparent qubit manipulations with spin-orbit coupled two-electron nanowire quantum dot10.1038/s41598-021-98152-z2045-2322https://doaj.org/article/78a2e47836b74c3c97039413e5e323972021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98152-zhttps://doaj.org/toc/2045-2322Abstract We report on the first set of exact orthonormalized states to an ac driven one-dimensional (1D) two-electron nanowire quantum dot with the Rashba–Dresselhaus coexisted spin-orbit coupling (SOC) and the controlled magnetic field orientation and trapping frequency. In the ground state case, it is shown that the spatiotemporal evolutions of probability densities occupying internal spin states and the transfer rates between different spin states can be adjusted by the ac electric field and the intensities of SOC and magnetic field. Effects of the system parameters and initial-state-dependent constants on the mean entanglement are revealed, where the approximately maximal entanglement associated with the stronger SOC and its insensitivity to the initial and parametric perturbations are demonstrated numerically. A novel resonance transition mechanism is found, in which the ladder-like time-evolution process of expected energy and the transition time between two arbitrary exact states are controlled by the ac field strength. Using such maximally entangled exact states to encode qubits can render the qubit control more transparent and robust. The results could be extended to 2D case and to an array of two-electron quantum dots with weak neighboring coupling for quantum information processing.Kuo HaiYifan WangQiong ChenWenhua HaiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Kuo Hai Yifan Wang Qiong Chen Wenhua Hai Transparent qubit manipulations with spin-orbit coupled two-electron nanowire quantum dot
description	Abstract We report on the first set of exact orthonormalized states to an ac driven one-dimensional (1D) two-electron nanowire quantum dot with the Rashba–Dresselhaus coexisted spin-orbit coupling (SOC) and the controlled magnetic field orientation and trapping frequency. In the ground state case, it is shown that the spatiotemporal evolutions of probability densities occupying internal spin states and the transfer rates between different spin states can be adjusted by the ac electric field and the intensities of SOC and magnetic field. Effects of the system parameters and initial-state-dependent constants on the mean entanglement are revealed, where the approximately maximal entanglement associated with the stronger SOC and its insensitivity to the initial and parametric perturbations are demonstrated numerically. A novel resonance transition mechanism is found, in which the ladder-like time-evolution process of expected energy and the transition time between two arbitrary exact states are controlled by the ac field strength. Using such maximally entangled exact states to encode qubits can render the qubit control more transparent and robust. The results could be extended to 2D case and to an array of two-electron quantum dots with weak neighboring coupling for quantum information processing.
format	article
author	Kuo Hai Yifan Wang Qiong Chen Wenhua Hai
author_facet	Kuo Hai Yifan Wang Qiong Chen Wenhua Hai
author_sort	Kuo Hai
title	Transparent qubit manipulations with spin-orbit coupled two-electron nanowire quantum dot
title_short	Transparent qubit manipulations with spin-orbit coupled two-electron nanowire quantum dot
title_full	Transparent qubit manipulations with spin-orbit coupled two-electron nanowire quantum dot
title_fullStr	Transparent qubit manipulations with spin-orbit coupled two-electron nanowire quantum dot
title_full_unstemmed	Transparent qubit manipulations with spin-orbit coupled two-electron nanowire quantum dot
title_sort	transparent qubit manipulations with spin-orbit coupled two-electron nanowire quantum dot
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/78a2e47836b74c3c97039413e5e32397
work_keys_str_mv	AT kuohai transparentqubitmanipulationswithspinorbitcoupledtwoelectronnanowirequantumdot AT yifanwang transparentqubitmanipulationswithspinorbitcoupledtwoelectronnanowirequantumdot AT qiongchen transparentqubitmanipulationswithspinorbitcoupledtwoelectronnanowirequantumdot AT wenhuahai transparentqubitmanipulationswithspinorbitcoupledtwoelectronnanowirequantumdot
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Transparent qubit manipulations with spin-orbit coupled two-electron nanowire quantum dot

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