Leakage reduction in fast superconducting qubit gates via optimal control

Abstract Reaching high-speed, high-fidelity qubit operations requires precise control over the shape of the underlying pulses. For weakly anharmonic systems, such as superconducting transmon qubits, short gates lead to leakage to states outside of the computational subspace. Control pulses designed...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	M. Werninghaus, D. J. Egger, F. Roy, S. Machnes, F. K. Wilhelm, S. Filipp
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/86824cae1f9a4fc8ad75a27d7ebf2750
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:86824cae1f9a4fc8ad75a27d7ebf2750
record_format	dspace
spelling	oai:doaj.org-article:86824cae1f9a4fc8ad75a27d7ebf27502021-12-02T13:24:27ZLeakage reduction in fast superconducting qubit gates via optimal control10.1038/s41534-020-00346-22056-6387https://doaj.org/article/86824cae1f9a4fc8ad75a27d7ebf27502021-01-01T00:00:00Zhttps://doi.org/10.1038/s41534-020-00346-2https://doaj.org/toc/2056-6387Abstract Reaching high-speed, high-fidelity qubit operations requires precise control over the shape of the underlying pulses. For weakly anharmonic systems, such as superconducting transmon qubits, short gates lead to leakage to states outside of the computational subspace. Control pulses designed with open-loop optimal control may reduce such leakage. However, model inaccuracies can severely limit the usability of such pulses. We implemented a closed-loop optimization that simultaneously adapts all control parameters based on measurements of a cost function built from Clifford gates. We directly optimize the amplitude and phase of each sample point of the digitized control pulse. We thereby fully exploit the capabilities of the pulse generation electronics and create a 4.16 ns single-qubit pulse with 99.76 % fidelity and 0.044 % leakage. This is a sevenfold reduction of the leakage rate and a threefold reduction in standard errors of the best DRAG pulse we have calibrated at such short durations on the same system.M. WerninghausD. J. EggerF. RoyS. MachnesF. K. WilhelmS. FilippNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-6 (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 M. Werninghaus D. J. Egger F. Roy S. Machnes F. K. Wilhelm S. Filipp Leakage reduction in fast superconducting qubit gates via optimal control
description	Abstract Reaching high-speed, high-fidelity qubit operations requires precise control over the shape of the underlying pulses. For weakly anharmonic systems, such as superconducting transmon qubits, short gates lead to leakage to states outside of the computational subspace. Control pulses designed with open-loop optimal control may reduce such leakage. However, model inaccuracies can severely limit the usability of such pulses. We implemented a closed-loop optimization that simultaneously adapts all control parameters based on measurements of a cost function built from Clifford gates. We directly optimize the amplitude and phase of each sample point of the digitized control pulse. We thereby fully exploit the capabilities of the pulse generation electronics and create a 4.16 ns single-qubit pulse with 99.76 % fidelity and 0.044 % leakage. This is a sevenfold reduction of the leakage rate and a threefold reduction in standard errors of the best DRAG pulse we have calibrated at such short durations on the same system.
format	article
author	M. Werninghaus D. J. Egger F. Roy S. Machnes F. K. Wilhelm S. Filipp
author_facet	M. Werninghaus D. J. Egger F. Roy S. Machnes F. K. Wilhelm S. Filipp
author_sort	M. Werninghaus
title	Leakage reduction in fast superconducting qubit gates via optimal control
title_short	Leakage reduction in fast superconducting qubit gates via optimal control
title_full	Leakage reduction in fast superconducting qubit gates via optimal control
title_fullStr	Leakage reduction in fast superconducting qubit gates via optimal control
title_full_unstemmed	Leakage reduction in fast superconducting qubit gates via optimal control
title_sort	leakage reduction in fast superconducting qubit gates via optimal control
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/86824cae1f9a4fc8ad75a27d7ebf2750
work_keys_str_mv	AT mwerninghaus leakagereductioninfastsuperconductingqubitgatesviaoptimalcontrol AT djegger leakagereductioninfastsuperconductingqubitgatesviaoptimalcontrol AT froy leakagereductioninfastsuperconductingqubitgatesviaoptimalcontrol AT smachnes leakagereductioninfastsuperconductingqubitgatesviaoptimalcontrol AT fkwilhelm leakagereductioninfastsuperconductingqubitgatesviaoptimalcontrol AT sfilipp leakagereductioninfastsuperconductingqubitgatesviaoptimalcontrol
_version_	1718393105905876992

Leakage reduction in fast superconducting qubit gates via optimal control

Ejemplares similares