Optimal operation points for ultrafast, highly coherent Ge hole spin-orbit qubits

Abstract Strong spin-orbit interactions make hole quantum dots central to the quest for electrical spin qubit manipulation enabling fast, low-power, scalable quantum computation. Yet it is important to establish to what extent spin-orbit coupling exposes qubits to electrical noise, facilitating deco...

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Autores principales:	Zhanning Wang, Elizabeth Marcellina, Alex. R. Hamilton, James H. Cullen, Sven Rogge, Joe Salfi, Dimitrie Culcer
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/ee879c97ea1e4ca1acc0c997a79b3a9b
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spelling	oai:doaj.org-article:ee879c97ea1e4ca1acc0c997a79b3a9b2021-12-02T18:17:56ZOptimal operation points for ultrafast, highly coherent Ge hole spin-orbit qubits10.1038/s41534-021-00386-22056-6387https://doaj.org/article/ee879c97ea1e4ca1acc0c997a79b3a9b2021-04-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00386-2https://doaj.org/toc/2056-6387Abstract Strong spin-orbit interactions make hole quantum dots central to the quest for electrical spin qubit manipulation enabling fast, low-power, scalable quantum computation. Yet it is important to establish to what extent spin-orbit coupling exposes qubits to electrical noise, facilitating decoherence. Here, taking Ge as an example, we show that group IV gate-defined hole spin qubits generically exhibit optimal operation points, defined by the top gate electric field, at which they are both fast and long-lived: the dephasing rate vanishes to first order in the electric field noise along with all directions in space, the electron dipole spin resonance strength is maximized, while relaxation is drastically reduced at small magnetic fields. The existence of optimal operation points is traced to group IV crystal symmetry and properties of the Rashba spin-orbit interaction unique to spin-3/2 systems. Our results overturn the conventional wisdom that fast operation implies reduced lifetimes and suggest group IV hole spin qubits as ideal platforms for ultra-fast, highly coherent scalable quantum computing.Zhanning WangElizabeth MarcellinaAlex. R. HamiltonJames H. CullenSven RoggeJoe SalfiDimitrie CulcerNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
spellingShingle	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95 Zhanning Wang Elizabeth Marcellina Alex. R. Hamilton James H. Cullen Sven Rogge Joe Salfi Dimitrie Culcer Optimal operation points for ultrafast, highly coherent Ge hole spin-orbit qubits
description	Abstract Strong spin-orbit interactions make hole quantum dots central to the quest for electrical spin qubit manipulation enabling fast, low-power, scalable quantum computation. Yet it is important to establish to what extent spin-orbit coupling exposes qubits to electrical noise, facilitating decoherence. Here, taking Ge as an example, we show that group IV gate-defined hole spin qubits generically exhibit optimal operation points, defined by the top gate electric field, at which they are both fast and long-lived: the dephasing rate vanishes to first order in the electric field noise along with all directions in space, the electron dipole spin resonance strength is maximized, while relaxation is drastically reduced at small magnetic fields. The existence of optimal operation points is traced to group IV crystal symmetry and properties of the Rashba spin-orbit interaction unique to spin-3/2 systems. Our results overturn the conventional wisdom that fast operation implies reduced lifetimes and suggest group IV hole spin qubits as ideal platforms for ultra-fast, highly coherent scalable quantum computing.
format	article
author	Zhanning Wang Elizabeth Marcellina Alex. R. Hamilton James H. Cullen Sven Rogge Joe Salfi Dimitrie Culcer
author_facet	Zhanning Wang Elizabeth Marcellina Alex. R. Hamilton James H. Cullen Sven Rogge Joe Salfi Dimitrie Culcer
author_sort	Zhanning Wang
title	Optimal operation points for ultrafast, highly coherent Ge hole spin-orbit qubits
title_short	Optimal operation points for ultrafast, highly coherent Ge hole spin-orbit qubits
title_full	Optimal operation points for ultrafast, highly coherent Ge hole spin-orbit qubits
title_fullStr	Optimal operation points for ultrafast, highly coherent Ge hole spin-orbit qubits
title_full_unstemmed	Optimal operation points for ultrafast, highly coherent Ge hole spin-orbit qubits
title_sort	optimal operation points for ultrafast, highly coherent ge hole spin-orbit qubits
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/ee879c97ea1e4ca1acc0c997a79b3a9b
work_keys_str_mv	AT zhanningwang optimaloperationpointsforultrafasthighlycoherentgeholespinorbitqubits AT elizabethmarcellina optimaloperationpointsforultrafasthighlycoherentgeholespinorbitqubits AT alexrhamilton optimaloperationpointsforultrafasthighlycoherentgeholespinorbitqubits AT jameshcullen optimaloperationpointsforultrafasthighlycoherentgeholespinorbitqubits AT svenrogge optimaloperationpointsforultrafasthighlycoherentgeholespinorbitqubits AT joesalfi optimaloperationpointsforultrafasthighlycoherentgeholespinorbitqubits AT dimitrieculcer optimaloperationpointsforultrafasthighlycoherentgeholespinorbitqubits
_version_	1718378307421995008

Optimal operation points for ultrafast, highly coherent Ge hole spin-orbit qubits

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