Characterizing decoherence rates of a superconducting qubit by direct microwave scattering

Abstract We experimentally investigate a superconducting qubit coupled to the end of an open transmission line, in a regime where the qubit decay rates to the transmission line and to its own environment are comparable. We perform measurements of coherent and incoherent scattering, on- and off-reson...

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Autores principales:	Yong Lu, Andreas Bengtsson, Jonathan J. Burnett, Emely Wiegand, Baladitya Suri, Philip Krantz, Anita Fadavi Roudsari, Anton Frisk Kockum, Simone Gasparinetti, Göran Johansson, Per Delsing
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/e1515629cfdc4b57ae3ac2644563f262
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spelling	oai:doaj.org-article:e1515629cfdc4b57ae3ac2644563f2622021-12-02T14:04:43ZCharacterizing decoherence rates of a superconducting qubit by direct microwave scattering10.1038/s41534-021-00367-52056-6387https://doaj.org/article/e1515629cfdc4b57ae3ac2644563f2622021-02-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00367-5https://doaj.org/toc/2056-6387Abstract We experimentally investigate a superconducting qubit coupled to the end of an open transmission line, in a regime where the qubit decay rates to the transmission line and to its own environment are comparable. We perform measurements of coherent and incoherent scattering, on- and off-resonant fluorescence, and time-resolved dynamics to determine the decay and decoherence rates of the qubit. In particular, these measurements let us discriminate between non-radiative decay and pure dephasing. We combine and contrast results across all methods and find consistent values for the extracted rates. The results show that the pure dephasing rate is one order of magnitude smaller than the non-radiative decay rate for our qubit. Our results indicate a pathway to benchmark decoherence rates of superconducting qubits in a resonator-free setting.Yong LuAndreas BengtssonJonathan J. BurnettEmely WiegandBaladitya SuriPhilip KrantzAnita Fadavi RoudsariAnton Frisk KockumSimone GasparinettiGöran JohanssonPer DelsingNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95
spellingShingle	Physics QC1-999 Electronic computers. Computer science QA75.5-76.95 Yong Lu Andreas Bengtsson Jonathan J. Burnett Emely Wiegand Baladitya Suri Philip Krantz Anita Fadavi Roudsari Anton Frisk Kockum Simone Gasparinetti Göran Johansson Per Delsing Characterizing decoherence rates of a superconducting qubit by direct microwave scattering
description	Abstract We experimentally investigate a superconducting qubit coupled to the end of an open transmission line, in a regime where the qubit decay rates to the transmission line and to its own environment are comparable. We perform measurements of coherent and incoherent scattering, on- and off-resonant fluorescence, and time-resolved dynamics to determine the decay and decoherence rates of the qubit. In particular, these measurements let us discriminate between non-radiative decay and pure dephasing. We combine and contrast results across all methods and find consistent values for the extracted rates. The results show that the pure dephasing rate is one order of magnitude smaller than the non-radiative decay rate for our qubit. Our results indicate a pathway to benchmark decoherence rates of superconducting qubits in a resonator-free setting.
format	article
author	Yong Lu Andreas Bengtsson Jonathan J. Burnett Emely Wiegand Baladitya Suri Philip Krantz Anita Fadavi Roudsari Anton Frisk Kockum Simone Gasparinetti Göran Johansson Per Delsing
author_facet	Yong Lu Andreas Bengtsson Jonathan J. Burnett Emely Wiegand Baladitya Suri Philip Krantz Anita Fadavi Roudsari Anton Frisk Kockum Simone Gasparinetti Göran Johansson Per Delsing
author_sort	Yong Lu
title	Characterizing decoherence rates of a superconducting qubit by direct microwave scattering
title_short	Characterizing decoherence rates of a superconducting qubit by direct microwave scattering
title_full	Characterizing decoherence rates of a superconducting qubit by direct microwave scattering
title_fullStr	Characterizing decoherence rates of a superconducting qubit by direct microwave scattering
title_full_unstemmed	Characterizing decoherence rates of a superconducting qubit by direct microwave scattering
title_sort	characterizing decoherence rates of a superconducting qubit by direct microwave scattering
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/e1515629cfdc4b57ae3ac2644563f262
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Characterizing decoherence rates of a superconducting qubit by direct microwave scattering

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