High-Fidelity Measurement of a Superconducting Qubit Using an On-Chip Microwave Photon Counter

We describe an approach to the high-fidelity measurement of a superconducting qubit using an on-chip microwave photon counter. The protocol relies on the transient response of a dispersively coupled measurement resonator to map the state of the qubit to “bright” and “dark” cavity pointer states that...

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Autores principales:	A. Opremcak, C. H. Liu, C. Wilen, K. Okubo, B. G. Christensen, D. Sank, T. C. White, A. Vainsencher, M. Giustina, A. Megrant, B. Burkett, B. L. T. Plourde, R. McDermott
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/243b5350086f47a6b050355f93534096
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spelling	oai:doaj.org-article:243b5350086f47a6b050355f935340962021-12-02T14:26:04ZHigh-Fidelity Measurement of a Superconducting Qubit Using an On-Chip Microwave Photon Counter10.1103/PhysRevX.11.0110272160-3308https://doaj.org/article/243b5350086f47a6b050355f935340962021-02-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.011027http://doi.org/10.1103/PhysRevX.11.011027https://doaj.org/toc/2160-3308We describe an approach to the high-fidelity measurement of a superconducting qubit using an on-chip microwave photon counter. The protocol relies on the transient response of a dispersively coupled measurement resonator to map the state of the qubit to “bright” and “dark” cavity pointer states that are characterized by a large differential photon occupation. Following this mapping, we photodetect the resonator using the Josephson photomultiplier, which transitions between classically distinguishable flux states when cavity photon occupation exceeds a certain threshold. Our technique provides access to the binary outcome of projective quantum measurement at the millikelvin stage without the need for quantum-limited preamplification and thresholding at room temperature. We achieve raw single-shot measurement fidelity in excess of 98% across multiple samples using this approach in total measurement times under 500 ns. In addition, we show that the backaction and crosstalk associated with our measurement protocol can be mitigated by exploiting the intrinsic damping of the Josephson photomultiplier itself.A. OpremcakC. H. LiuC. WilenK. OkuboB. G. ChristensenD. SankT. C. WhiteA. VainsencherM. GiustinaA. MegrantB. BurkettB. L. T. PlourdeR. McDermottAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 1, p 011027 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 A. Opremcak C. H. Liu C. Wilen K. Okubo B. G. Christensen D. Sank T. C. White A. Vainsencher M. Giustina A. Megrant B. Burkett B. L. T. Plourde R. McDermott High-Fidelity Measurement of a Superconducting Qubit Using an On-Chip Microwave Photon Counter
description	We describe an approach to the high-fidelity measurement of a superconducting qubit using an on-chip microwave photon counter. The protocol relies on the transient response of a dispersively coupled measurement resonator to map the state of the qubit to “bright” and “dark” cavity pointer states that are characterized by a large differential photon occupation. Following this mapping, we photodetect the resonator using the Josephson photomultiplier, which transitions between classically distinguishable flux states when cavity photon occupation exceeds a certain threshold. Our technique provides access to the binary outcome of projective quantum measurement at the millikelvin stage without the need for quantum-limited preamplification and thresholding at room temperature. We achieve raw single-shot measurement fidelity in excess of 98% across multiple samples using this approach in total measurement times under 500 ns. In addition, we show that the backaction and crosstalk associated with our measurement protocol can be mitigated by exploiting the intrinsic damping of the Josephson photomultiplier itself.
format	article
author	A. Opremcak C. H. Liu C. Wilen K. Okubo B. G. Christensen D. Sank T. C. White A. Vainsencher M. Giustina A. Megrant B. Burkett B. L. T. Plourde R. McDermott
author_facet	A. Opremcak C. H. Liu C. Wilen K. Okubo B. G. Christensen D. Sank T. C. White A. Vainsencher M. Giustina A. Megrant B. Burkett B. L. T. Plourde R. McDermott
author_sort	A. Opremcak
title	High-Fidelity Measurement of a Superconducting Qubit Using an On-Chip Microwave Photon Counter
title_short	High-Fidelity Measurement of a Superconducting Qubit Using an On-Chip Microwave Photon Counter
title_full	High-Fidelity Measurement of a Superconducting Qubit Using an On-Chip Microwave Photon Counter
title_fullStr	High-Fidelity Measurement of a Superconducting Qubit Using an On-Chip Microwave Photon Counter
title_full_unstemmed	High-Fidelity Measurement of a Superconducting Qubit Using an On-Chip Microwave Photon Counter
title_sort	high-fidelity measurement of a superconducting qubit using an on-chip microwave photon counter
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/243b5350086f47a6b050355f93534096
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High-Fidelity Measurement of a Superconducting Qubit Using an On-Chip Microwave Photon Counter

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