Realization of High-Fidelity CZ and ZZ-Free iSWAP Gates with a Tunable Coupler

High-fidelity two-qubit gates at scale are a key requirement to realize the full promise of quantum computation and simulation. The advent and use of coupler elements to tunably control two-qubit interactions has improved operational fidelity in many-qubit systems by reducing parasitic coupling and...

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Autores principales:	Youngkyu Sung, Leon Ding, Jochen Braumüller, Antti Vepsäläinen, Bharath Kannan, Morten Kjaergaard, Ami Greene, Gabriel O. Samach, Chris McNally, David Kim, Alexander Melville, Bethany M. Niedzielski, Mollie E. Schwartz, Jonilyn L. Yoder, Terry P. Orlando, Simon Gustavsson, William D. Oliver
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/0c7ac0af40bc48ee8c2aeff5bc7eb781
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spelling	oai:doaj.org-article:0c7ac0af40bc48ee8c2aeff5bc7eb7812021-12-02T17:51:26ZRealization of High-Fidelity CZ and ZZ-Free iSWAP Gates with a Tunable Coupler10.1103/PhysRevX.11.0210582160-3308https://doaj.org/article/0c7ac0af40bc48ee8c2aeff5bc7eb7812021-06-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.021058http://doi.org/10.1103/PhysRevX.11.021058https://doaj.org/toc/2160-3308High-fidelity two-qubit gates at scale are a key requirement to realize the full promise of quantum computation and simulation. The advent and use of coupler elements to tunably control two-qubit interactions has improved operational fidelity in many-qubit systems by reducing parasitic coupling and frequency crowding issues. Nonetheless, two-qubit gate errors still limit the capability of near-term quantum applications. The reason, in part, is that the existing framework for tunable couplers based on the dispersive approximation does not fully incorporate three-body multilevel dynamics, which is essential for addressing coherent leakage to the coupler and parasitic longitudinal (ZZ) interactions during two-qubit gates. Here, we present a systematic approach that goes beyond the dispersive approximation to exploit the engineered level structure of the coupler and optimize its control. Using this approach, we experimentally demonstrate CZ and ZZ-free iSWAP gates with two-qubit interaction fidelities of 99.76±0.07% and 99.87±0.23%, respectively, which are close to their T_{1} limits.Youngkyu SungLeon DingJochen BraumüllerAntti VepsäläinenBharath KannanMorten KjaergaardAmi GreeneGabriel O. SamachChris McNallyDavid KimAlexander MelvilleBethany M. NiedzielskiMollie E. SchwartzJonilyn L. YoderTerry P. OrlandoSimon GustavssonWilliam D. OliverAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 2, p 021058 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Youngkyu Sung Leon Ding Jochen Braumüller Antti Vepsäläinen Bharath Kannan Morten Kjaergaard Ami Greene Gabriel O. Samach Chris McNally David Kim Alexander Melville Bethany M. Niedzielski Mollie E. Schwartz Jonilyn L. Yoder Terry P. Orlando Simon Gustavsson William D. Oliver Realization of High-Fidelity CZ and ZZ-Free iSWAP Gates with a Tunable Coupler
description	High-fidelity two-qubit gates at scale are a key requirement to realize the full promise of quantum computation and simulation. The advent and use of coupler elements to tunably control two-qubit interactions has improved operational fidelity in many-qubit systems by reducing parasitic coupling and frequency crowding issues. Nonetheless, two-qubit gate errors still limit the capability of near-term quantum applications. The reason, in part, is that the existing framework for tunable couplers based on the dispersive approximation does not fully incorporate three-body multilevel dynamics, which is essential for addressing coherent leakage to the coupler and parasitic longitudinal (ZZ) interactions during two-qubit gates. Here, we present a systematic approach that goes beyond the dispersive approximation to exploit the engineered level structure of the coupler and optimize its control. Using this approach, we experimentally demonstrate CZ and ZZ-free iSWAP gates with two-qubit interaction fidelities of 99.76±0.07% and 99.87±0.23%, respectively, which are close to their T_{1} limits.
format	article
author	Youngkyu Sung Leon Ding Jochen Braumüller Antti Vepsäläinen Bharath Kannan Morten Kjaergaard Ami Greene Gabriel O. Samach Chris McNally David Kim Alexander Melville Bethany M. Niedzielski Mollie E. Schwartz Jonilyn L. Yoder Terry P. Orlando Simon Gustavsson William D. Oliver
author_facet	Youngkyu Sung Leon Ding Jochen Braumüller Antti Vepsäläinen Bharath Kannan Morten Kjaergaard Ami Greene Gabriel O. Samach Chris McNally David Kim Alexander Melville Bethany M. Niedzielski Mollie E. Schwartz Jonilyn L. Yoder Terry P. Orlando Simon Gustavsson William D. Oliver
author_sort	Youngkyu Sung
title	Realization of High-Fidelity CZ and ZZ-Free iSWAP Gates with a Tunable Coupler
title_short	Realization of High-Fidelity CZ and ZZ-Free iSWAP Gates with a Tunable Coupler
title_full	Realization of High-Fidelity CZ and ZZ-Free iSWAP Gates with a Tunable Coupler
title_fullStr	Realization of High-Fidelity CZ and ZZ-Free iSWAP Gates with a Tunable Coupler
title_full_unstemmed	Realization of High-Fidelity CZ and ZZ-Free iSWAP Gates with a Tunable Coupler
title_sort	realization of high-fidelity cz and zz-free iswap gates with a tunable coupler
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/0c7ac0af40bc48ee8c2aeff5bc7eb781
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Realization of High-Fidelity CZ and ZZ-Free iSWAP Gates with a Tunable Coupler

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