Fast Logic with Slow Qubits: Microwave-Activated Controlled-Z Gate on Low-Frequency Fluxoniums

We demonstrate a controlled-Z gate between capacitively coupled fluxonium qubits with transition frequencies 72.3 and 136.3 MHz. The gate is activated by a 61.6-ns-long pulse at a frequency between noncomputational transitions |10⟩-|20⟩ and |11⟩-|21⟩, during which the qubits complete only four and e...

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Autores principales:	Quentin Ficheux, Long B. Nguyen, Aaron Somoroff, Haonan Xiong, Konstantin N. Nesterov, Maxim G. Vavilov, Vladimir E. Manucharyan
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/25e56d548f74432b9b79eb9e361e537e
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spelling	oai:doaj.org-article:25e56d548f74432b9b79eb9e361e537e2021-12-02T16:48:16ZFast Logic with Slow Qubits: Microwave-Activated Controlled-Z Gate on Low-Frequency Fluxoniums10.1103/PhysRevX.11.0210262160-3308https://doaj.org/article/25e56d548f74432b9b79eb9e361e537e2021-05-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.021026http://doi.org/10.1103/PhysRevX.11.021026https://doaj.org/toc/2160-3308We demonstrate a controlled-Z gate between capacitively coupled fluxonium qubits with transition frequencies 72.3 and 136.3 MHz. The gate is activated by a 61.6-ns-long pulse at a frequency between noncomputational transitions \|10⟩-\|20⟩ and \|11⟩-\|21⟩, during which the qubits complete only four and eight Larmor periods, respectively. The measured gate error of (8±1)×10^{-3} is limited by decoherence in the noncomputational subspace, which will likely improve in the next-generation devices. Although our qubits are about 50 times slower than transmons, the two-qubit gate is faster than microwave-activated gates on transmons, and the gate error is on par with the lowest reported. Architectural advantages of low-frequency fluxoniums include long qubit coherence time, weak hybridization in the computational subspace, suppressed residual ZZ-coupling rate (here 46 kHz), and the absence of either excessive parameter-matching or complex pulse-shaping requirements.Quentin FicheuxLong B. NguyenAaron SomoroffHaonan XiongKonstantin N. NesterovMaxim G. VavilovVladimir E. ManucharyanAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 2, p 021026 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Quentin Ficheux Long B. Nguyen Aaron Somoroff Haonan Xiong Konstantin N. Nesterov Maxim G. Vavilov Vladimir E. Manucharyan Fast Logic with Slow Qubits: Microwave-Activated Controlled-Z Gate on Low-Frequency Fluxoniums
description	We demonstrate a controlled-Z gate between capacitively coupled fluxonium qubits with transition frequencies 72.3 and 136.3 MHz. The gate is activated by a 61.6-ns-long pulse at a frequency between noncomputational transitions \|10⟩-\|20⟩ and \|11⟩-\|21⟩, during which the qubits complete only four and eight Larmor periods, respectively. The measured gate error of (8±1)×10^{-3} is limited by decoherence in the noncomputational subspace, which will likely improve in the next-generation devices. Although our qubits are about 50 times slower than transmons, the two-qubit gate is faster than microwave-activated gates on transmons, and the gate error is on par with the lowest reported. Architectural advantages of low-frequency fluxoniums include long qubit coherence time, weak hybridization in the computational subspace, suppressed residual ZZ-coupling rate (here 46 kHz), and the absence of either excessive parameter-matching or complex pulse-shaping requirements.
format	article
author	Quentin Ficheux Long B. Nguyen Aaron Somoroff Haonan Xiong Konstantin N. Nesterov Maxim G. Vavilov Vladimir E. Manucharyan
author_facet	Quentin Ficheux Long B. Nguyen Aaron Somoroff Haonan Xiong Konstantin N. Nesterov Maxim G. Vavilov Vladimir E. Manucharyan
author_sort	Quentin Ficheux
title	Fast Logic with Slow Qubits: Microwave-Activated Controlled-Z Gate on Low-Frequency Fluxoniums
title_short	Fast Logic with Slow Qubits: Microwave-Activated Controlled-Z Gate on Low-Frequency Fluxoniums
title_full	Fast Logic with Slow Qubits: Microwave-Activated Controlled-Z Gate on Low-Frequency Fluxoniums
title_fullStr	Fast Logic with Slow Qubits: Microwave-Activated Controlled-Z Gate on Low-Frequency Fluxoniums
title_full_unstemmed	Fast Logic with Slow Qubits: Microwave-Activated Controlled-Z Gate on Low-Frequency Fluxoniums
title_sort	fast logic with slow qubits: microwave-activated controlled-z gate on low-frequency fluxoniums
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/25e56d548f74432b9b79eb9e361e537e
work_keys_str_mv	AT quentinficheux fastlogicwithslowqubitsmicrowaveactivatedcontrolledzgateonlowfrequencyfluxoniums AT longbnguyen fastlogicwithslowqubitsmicrowaveactivatedcontrolledzgateonlowfrequencyfluxoniums AT aaronsomoroff fastlogicwithslowqubitsmicrowaveactivatedcontrolledzgateonlowfrequencyfluxoniums AT haonanxiong fastlogicwithslowqubitsmicrowaveactivatedcontrolledzgateonlowfrequencyfluxoniums AT konstantinnnesterov fastlogicwithslowqubitsmicrowaveactivatedcontrolledzgateonlowfrequencyfluxoniums AT maximgvavilov fastlogicwithslowqubitsmicrowaveactivatedcontrolledzgateonlowfrequencyfluxoniums AT vladimiremanucharyan fastlogicwithslowqubitsmicrowaveactivatedcontrolledzgateonlowfrequencyfluxoniums
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Fast Logic with Slow Qubits: Microwave-Activated Controlled-Z Gate on Low-Frequency Fluxoniums

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