Fast High-Fidelity Quantum Nondemolition Qubit Readout via a Nonperturbative Cross-Kerr Coupling

Qubit readout is an indispensable element of any quantum information processor. In this work, we experimentally demonstrate a nonperturbative cross-Kerr couplingbetween a transmon and polariton mode which enables an improved quantum nondemolition (QND) readout for superconducting qubits. The new mec...

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Autores principales:	R. Dassonneville, T. Ramos, V. Milchakov, L. Planat, É. Dumur, F. Foroughi, J. Puertas, S. Leger, K. Bharadwaj, J. Delaforce, C. Naud, W. Hasch-Guichard, J. J. García-Ripoll, N. Roch, O. Buisson
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2020
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/73520c36d96545bbabe358a88cf6cf31
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id	oai:doaj.org-article:73520c36d96545bbabe358a88cf6cf31
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spelling	oai:doaj.org-article:73520c36d96545bbabe358a88cf6cf312021-12-02T14:28:49ZFast High-Fidelity Quantum Nondemolition Qubit Readout via a Nonperturbative Cross-Kerr Coupling10.1103/PhysRevX.10.0110452160-3308https://doaj.org/article/73520c36d96545bbabe358a88cf6cf312020-02-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.10.011045http://doi.org/10.1103/PhysRevX.10.011045https://doaj.org/toc/2160-3308Qubit readout is an indispensable element of any quantum information processor. In this work, we experimentally demonstrate a nonperturbative cross-Kerr couplingbetween a transmon and polariton mode which enables an improved quantum nondemolition (QND) readout for superconducting qubits. The new mechanism uses the same experimental techniques as the standard QND qubit readout in the dispersive approximation, but due to its nonperturbative nature, it maximizes the speed, the single-shot fidelity, and the QND properties of the readout. In addition, it minimizes the effect of unwanted decay channels such as the Purcell effect. We observe a single-shot readout fidelity of 97.4% for short 50-ns pulses and we quantify a QND-ness of 99% for long measurement pulses with repeated single-shot readouts.R. DassonnevilleT. RamosV. MilchakovL. PlanatÉ. DumurF. ForoughiJ. PuertasS. LegerK. BharadwajJ. DelaforceC. NaudW. Hasch-GuichardJ. J. García-RipollN. RochO. BuissonAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 10, Iss 1, p 011045 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 R. Dassonneville T. Ramos V. Milchakov L. Planat É. Dumur F. Foroughi J. Puertas S. Leger K. Bharadwaj J. Delaforce C. Naud W. Hasch-Guichard J. J. García-Ripoll N. Roch O. Buisson Fast High-Fidelity Quantum Nondemolition Qubit Readout via a Nonperturbative Cross-Kerr Coupling
description	Qubit readout is an indispensable element of any quantum information processor. In this work, we experimentally demonstrate a nonperturbative cross-Kerr couplingbetween a transmon and polariton mode which enables an improved quantum nondemolition (QND) readout for superconducting qubits. The new mechanism uses the same experimental techniques as the standard QND qubit readout in the dispersive approximation, but due to its nonperturbative nature, it maximizes the speed, the single-shot fidelity, and the QND properties of the readout. In addition, it minimizes the effect of unwanted decay channels such as the Purcell effect. We observe a single-shot readout fidelity of 97.4% for short 50-ns pulses and we quantify a QND-ness of 99% for long measurement pulses with repeated single-shot readouts.
format	article
author	R. Dassonneville T. Ramos V. Milchakov L. Planat É. Dumur F. Foroughi J. Puertas S. Leger K. Bharadwaj J. Delaforce C. Naud W. Hasch-Guichard J. J. García-Ripoll N. Roch O. Buisson
author_facet	R. Dassonneville T. Ramos V. Milchakov L. Planat É. Dumur F. Foroughi J. Puertas S. Leger K. Bharadwaj J. Delaforce C. Naud W. Hasch-Guichard J. J. García-Ripoll N. Roch O. Buisson
author_sort	R. Dassonneville
title	Fast High-Fidelity Quantum Nondemolition Qubit Readout via a Nonperturbative Cross-Kerr Coupling
title_short	Fast High-Fidelity Quantum Nondemolition Qubit Readout via a Nonperturbative Cross-Kerr Coupling
title_full	Fast High-Fidelity Quantum Nondemolition Qubit Readout via a Nonperturbative Cross-Kerr Coupling
title_fullStr	Fast High-Fidelity Quantum Nondemolition Qubit Readout via a Nonperturbative Cross-Kerr Coupling
title_full_unstemmed	Fast High-Fidelity Quantum Nondemolition Qubit Readout via a Nonperturbative Cross-Kerr Coupling
title_sort	fast high-fidelity quantum nondemolition qubit readout via a nonperturbative cross-kerr coupling
publisher	American Physical Society
publishDate	2020
url	https://doaj.org/article/73520c36d96545bbabe358a88cf6cf31
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Fast High-Fidelity Quantum Nondemolition Qubit Readout via a Nonperturbative Cross-Kerr Coupling

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