Primary Thermometry of Propagating Microwaves in the Quantum Regime

The ability to control and measure the temperature of propagating microwave modes down to very low temperatures is indispensable for quantum information processing and may open opportunities for studies of heat transport at the nanoscale, also in the quantum regime. Here, we propose and experimental...

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Autores principales:	Marco Scigliuzzo, Andreas Bengtsson, Jean-Claude Besse, Andreas Wallraff, Per Delsing, Simone Gasparinetti
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2020
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/4e44a3f21fbe4ca0bd27746141363369
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spelling	oai:doaj.org-article:4e44a3f21fbe4ca0bd277461413633692021-12-02T14:23:38ZPrimary Thermometry of Propagating Microwaves in the Quantum Regime10.1103/PhysRevX.10.0410542160-3308https://doaj.org/article/4e44a3f21fbe4ca0bd277461413633692020-12-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.10.041054http://doi.org/10.1103/PhysRevX.10.041054https://doaj.org/toc/2160-3308The ability to control and measure the temperature of propagating microwave modes down to very low temperatures is indispensable for quantum information processing and may open opportunities for studies of heat transport at the nanoscale, also in the quantum regime. Here, we propose and experimentally demonstrate primary thermometry of propagating microwaves using a transmon-type superconducting circuit. Our device operates continuously, with a sensitivity down to 4×10^{-4} photons/sqrt[Hz] and a bandwidth of 40 MHz. We measure the thermal occupation of the modes of a highly attenuated coaxial cable in a range of 0.001 to 0.4 thermal photons, corresponding to a temperature range from 35 mK to 210 mK at a frequency around 5 GHz. To increase the radiation temperature in a controlled fashion, we either inject calibrated, wideband digital noise, or heat the device and its environment. This thermometry scheme can find applications in benchmarking and characterization of cryogenic microwave setups, temperature measurements in hybrid quantum systems, and quantum thermodynamics.Marco ScigliuzzoAndreas BengtssonJean-Claude BesseAndreas WallraffPer DelsingSimone GasparinettiAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 10, Iss 4, p 041054 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Marco Scigliuzzo Andreas Bengtsson Jean-Claude Besse Andreas Wallraff Per Delsing Simone Gasparinetti Primary Thermometry of Propagating Microwaves in the Quantum Regime
description	The ability to control and measure the temperature of propagating microwave modes down to very low temperatures is indispensable for quantum information processing and may open opportunities for studies of heat transport at the nanoscale, also in the quantum regime. Here, we propose and experimentally demonstrate primary thermometry of propagating microwaves using a transmon-type superconducting circuit. Our device operates continuously, with a sensitivity down to 4×10^{-4} photons/sqrt[Hz] and a bandwidth of 40 MHz. We measure the thermal occupation of the modes of a highly attenuated coaxial cable in a range of 0.001 to 0.4 thermal photons, corresponding to a temperature range from 35 mK to 210 mK at a frequency around 5 GHz. To increase the radiation temperature in a controlled fashion, we either inject calibrated, wideband digital noise, or heat the device and its environment. This thermometry scheme can find applications in benchmarking and characterization of cryogenic microwave setups, temperature measurements in hybrid quantum systems, and quantum thermodynamics.
format	article
author	Marco Scigliuzzo Andreas Bengtsson Jean-Claude Besse Andreas Wallraff Per Delsing Simone Gasparinetti
author_facet	Marco Scigliuzzo Andreas Bengtsson Jean-Claude Besse Andreas Wallraff Per Delsing Simone Gasparinetti
author_sort	Marco Scigliuzzo
title	Primary Thermometry of Propagating Microwaves in the Quantum Regime
title_short	Primary Thermometry of Propagating Microwaves in the Quantum Regime
title_full	Primary Thermometry of Propagating Microwaves in the Quantum Regime
title_fullStr	Primary Thermometry of Propagating Microwaves in the Quantum Regime
title_full_unstemmed	Primary Thermometry of Propagating Microwaves in the Quantum Regime
title_sort	primary thermometry of propagating microwaves in the quantum regime
publisher	American Physical Society
publishDate	2020
url	https://doaj.org/article/4e44a3f21fbe4ca0bd27746141363369
work_keys_str_mv	AT marcoscigliuzzo primarythermometryofpropagatingmicrowavesinthequantumregime AT andreasbengtsson primarythermometryofpropagatingmicrowavesinthequantumregime AT jeanclaudebesse primarythermometryofpropagatingmicrowavesinthequantumregime AT andreaswallraff primarythermometryofpropagatingmicrowavesinthequantumregime AT perdelsing primarythermometryofpropagatingmicrowavesinthequantumregime AT simonegasparinetti primarythermometryofpropagatingmicrowavesinthequantumregime
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Primary Thermometry of Propagating Microwaves in the Quantum Regime

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