Universal Nonadiabatic Control of Small-Gap Superconducting Qubits

Resonant transverse driving of a two-level system as viewed in the rotating frame couples two degenerate states at the Rabi frequency, an equivalence that emerges in quantum mechanics. While successful at controlling natural and artificial quantum systems, certain limitations may arise (e.g., the ac...

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Autores principales:	Daniel L. Campbell, Yun-Pil Shim, Bharath Kannan, Roni Winik, David K. Kim, Alexander Melville, Bethany M. Niedzielski, Jonilyn L. Yoder, Charles Tahan, Simon Gustavsson, William D. Oliver
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2020
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/c8545d1993684bfe973fecf5d74e2f82
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spelling	oai:doaj.org-article:c8545d1993684bfe973fecf5d74e2f822021-12-02T12:17:09ZUniversal Nonadiabatic Control of Small-Gap Superconducting Qubits10.1103/PhysRevX.10.0410512160-3308https://doaj.org/article/c8545d1993684bfe973fecf5d74e2f822020-12-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.10.041051http://doi.org/10.1103/PhysRevX.10.041051https://doaj.org/toc/2160-3308Resonant transverse driving of a two-level system as viewed in the rotating frame couples two degenerate states at the Rabi frequency, an equivalence that emerges in quantum mechanics. While successful at controlling natural and artificial quantum systems, certain limitations may arise (e.g., the achievable gate speed) due to nonidealities like the counterrotating term. We introduce a superconducting composite qubit (CQB), formed from two capacitively coupled transmon qubits, which features a small avoided crossing—smaller than the environmental temperature—between two energy levels. We control this low-frequency CQB using solely baseband pulses, nonadiabatic transitions, and coherent Landau-Zener interference to achieve fast, high-fidelity, single-qubit operations with Clifford fidelities exceeding 99.7%. We also perform coupled qubit operations between two low-frequency CQBs. This work demonstrates that universal nonadiabatic control of low-frequency qubits is feasible using solely baseband pulses.Daniel L. CampbellYun-Pil ShimBharath KannanRoni WinikDavid K. KimAlexander MelvilleBethany M. NiedzielskiJonilyn L. YoderCharles TahanSimon GustavssonWilliam D. OliverAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 10, Iss 4, p 041051 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Daniel L. Campbell Yun-Pil Shim Bharath Kannan Roni Winik David K. Kim Alexander Melville Bethany M. Niedzielski Jonilyn L. Yoder Charles Tahan Simon Gustavsson William D. Oliver Universal Nonadiabatic Control of Small-Gap Superconducting Qubits
description	Resonant transverse driving of a two-level system as viewed in the rotating frame couples two degenerate states at the Rabi frequency, an equivalence that emerges in quantum mechanics. While successful at controlling natural and artificial quantum systems, certain limitations may arise (e.g., the achievable gate speed) due to nonidealities like the counterrotating term. We introduce a superconducting composite qubit (CQB), formed from two capacitively coupled transmon qubits, which features a small avoided crossing—smaller than the environmental temperature—between two energy levels. We control this low-frequency CQB using solely baseband pulses, nonadiabatic transitions, and coherent Landau-Zener interference to achieve fast, high-fidelity, single-qubit operations with Clifford fidelities exceeding 99.7%. We also perform coupled qubit operations between two low-frequency CQBs. This work demonstrates that universal nonadiabatic control of low-frequency qubits is feasible using solely baseband pulses.
format	article
author	Daniel L. Campbell Yun-Pil Shim Bharath Kannan Roni Winik David K. Kim Alexander Melville Bethany M. Niedzielski Jonilyn L. Yoder Charles Tahan Simon Gustavsson William D. Oliver
author_facet	Daniel L. Campbell Yun-Pil Shim Bharath Kannan Roni Winik David K. Kim Alexander Melville Bethany M. Niedzielski Jonilyn L. Yoder Charles Tahan Simon Gustavsson William D. Oliver
author_sort	Daniel L. Campbell
title	Universal Nonadiabatic Control of Small-Gap Superconducting Qubits
title_short	Universal Nonadiabatic Control of Small-Gap Superconducting Qubits
title_full	Universal Nonadiabatic Control of Small-Gap Superconducting Qubits
title_fullStr	Universal Nonadiabatic Control of Small-Gap Superconducting Qubits
title_full_unstemmed	Universal Nonadiabatic Control of Small-Gap Superconducting Qubits
title_sort	universal nonadiabatic control of small-gap superconducting qubits
publisher	American Physical Society
publishDate	2020
url	https://doaj.org/article/c8545d1993684bfe973fecf5d74e2f82
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Universal Nonadiabatic Control of Small-Gap Superconducting Qubits

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