Quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source

Abstract We demonstrate an on-demand source of microwave single photons with 71–99% intrinsic quantum efficiency. The source is narrowband (300 kHz) and tuneable over a 600 MHz range around 5.2 GHz. Such a device is an important element in numerous quantum technologies and applications. The device c...

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Autores principales:	Yong Lu, Andreas Bengtsson, Jonathan J. Burnett, Baladitya Suri, Sankar Raman Sathyamoorthy, Hampus Renberg Nilsson, Marco Scigliuzzo, Jonas Bylander, 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/85636cd1841d4f309cc74b85fd00d94c
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spelling	oai:doaj.org-article:85636cd1841d4f309cc74b85fd00d94c2021-12-02T15:14:36ZQuantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source10.1038/s41534-021-00480-52056-6387https://doaj.org/article/85636cd1841d4f309cc74b85fd00d94c2021-09-01T00:00:00Zhttps://doi.org/10.1038/s41534-021-00480-5https://doaj.org/toc/2056-6387Abstract We demonstrate an on-demand source of microwave single photons with 71–99% intrinsic quantum efficiency. The source is narrowband (300 kHz) and tuneable over a 600 MHz range around 5.2 GHz. Such a device is an important element in numerous quantum technologies and applications. The device consists of a superconducting transmon qubit coupled to the open end of a transmission line. A π-pulse excites the qubit, which subsequently rapidly emits a single photon into the transmission line. A cancellation pulse then suppresses the reflected π-pulse by 33.5 dB, resulting in 0.005 photons leaking into the photon emission channel. We verify strong antibunching of the emitted photon field and determine its Wigner function. Non-radiative decay and 1/f flux noise both affect the quantum efficiency. We also study the device stability over time and identify uncorrelated discrete jumps of the pure dephasing rate at different qubit frequencies on a time scale of hours, which we attribute to independent two-level system defects in the device dielectrics, dispersively coupled to the qubit. Our single-photon source with only one input port is more compact and scalable compared to standard implementations.Yong LuAndreas BengtssonJonathan J. BurnettBaladitya SuriSankar Raman SathyamoorthyHampus Renberg NilssonMarco ScigliuzzoJonas BylanderGöran JohanssonPer DelsingNature PortfolioarticlePhysicsQC1-999Electronic computers. Computer scienceQA75.5-76.95ENnpj Quantum Information, Vol 7, Iss 1, Pp 1-8 (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 Baladitya Suri Sankar Raman Sathyamoorthy Hampus Renberg Nilsson Marco Scigliuzzo Jonas Bylander Göran Johansson Per Delsing Quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source
description	Abstract We demonstrate an on-demand source of microwave single photons with 71–99% intrinsic quantum efficiency. The source is narrowband (300 kHz) and tuneable over a 600 MHz range around 5.2 GHz. Such a device is an important element in numerous quantum technologies and applications. The device consists of a superconducting transmon qubit coupled to the open end of a transmission line. A π-pulse excites the qubit, which subsequently rapidly emits a single photon into the transmission line. A cancellation pulse then suppresses the reflected π-pulse by 33.5 dB, resulting in 0.005 photons leaking into the photon emission channel. We verify strong antibunching of the emitted photon field and determine its Wigner function. Non-radiative decay and 1/f flux noise both affect the quantum efficiency. We also study the device stability over time and identify uncorrelated discrete jumps of the pure dephasing rate at different qubit frequencies on a time scale of hours, which we attribute to independent two-level system defects in the device dielectrics, dispersively coupled to the qubit. Our single-photon source with only one input port is more compact and scalable compared to standard implementations.
format	article
author	Yong Lu Andreas Bengtsson Jonathan J. Burnett Baladitya Suri Sankar Raman Sathyamoorthy Hampus Renberg Nilsson Marco Scigliuzzo Jonas Bylander Göran Johansson Per Delsing
author_facet	Yong Lu Andreas Bengtsson Jonathan J. Burnett Baladitya Suri Sankar Raman Sathyamoorthy Hampus Renberg Nilsson Marco Scigliuzzo Jonas Bylander Göran Johansson Per Delsing
author_sort	Yong Lu
title	Quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source
title_short	Quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source
title_full	Quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source
title_fullStr	Quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source
title_full_unstemmed	Quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source
title_sort	quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/85636cd1841d4f309cc74b85fd00d94c
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Quantum efficiency, purity and stability of a tunable, narrowband microwave single-photon source

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