Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction

Abstract We demonstrate simultaneous measurements of DC transport properties and flux noise of a hybrid superconducting magnetometer based on the proximity effect (superconducting quantum interference proximity transistor, SQUIPT). The noise is probed by a cryogenic amplifier operating in the freque...

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Autores principales:	R. N. Jabdaraghi, D. S. Golubev, J. P. Pekola, J. T. Peltonen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/4690751532e04c0fb6e343efce4c85ad
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spelling	oai:doaj.org-article:4690751532e04c0fb6e343efce4c85ad2021-12-02T15:05:08ZNoise of a superconducting magnetic flux sensor based on a proximity Josephson junction10.1038/s41598-017-08710-72045-2322https://doaj.org/article/4690751532e04c0fb6e343efce4c85ad2017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08710-7https://doaj.org/toc/2045-2322Abstract We demonstrate simultaneous measurements of DC transport properties and flux noise of a hybrid superconducting magnetometer based on the proximity effect (superconducting quantum interference proximity transistor, SQUIPT). The noise is probed by a cryogenic amplifier operating in the frequency range of a few MHz. In our non-optimized device, we achieve minimum flux noise ~4 μΦ0/Hz1/2, set by the shot noise of the probe tunnel junction. The flux noise performance can be improved by further optimization of the SQUIPT parameters, primarily minimization of the proximity junction length and cross section. Furthermore, the experiment demonstrates that the setup can be used to investigate shot noise in other nonlinear devices with high impedance. This technique opens the opportunity to measure sensitive magnetometers including SQUIPT devices with very low dissipation.R. N. JabdaraghiD. S. GolubevJ. P. PekolaJ. T. PeltonenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q R. N. Jabdaraghi D. S. Golubev J. P. Pekola J. T. Peltonen Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction
description	Abstract We demonstrate simultaneous measurements of DC transport properties and flux noise of a hybrid superconducting magnetometer based on the proximity effect (superconducting quantum interference proximity transistor, SQUIPT). The noise is probed by a cryogenic amplifier operating in the frequency range of a few MHz. In our non-optimized device, we achieve minimum flux noise ~4 μΦ0/Hz1/2, set by the shot noise of the probe tunnel junction. The flux noise performance can be improved by further optimization of the SQUIPT parameters, primarily minimization of the proximity junction length and cross section. Furthermore, the experiment demonstrates that the setup can be used to investigate shot noise in other nonlinear devices with high impedance. This technique opens the opportunity to measure sensitive magnetometers including SQUIPT devices with very low dissipation.
format	article
author	R. N. Jabdaraghi D. S. Golubev J. P. Pekola J. T. Peltonen
author_facet	R. N. Jabdaraghi D. S. Golubev J. P. Pekola J. T. Peltonen
author_sort	R. N. Jabdaraghi
title	Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction
title_short	Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction
title_full	Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction
title_fullStr	Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction
title_full_unstemmed	Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction
title_sort	noise of a superconducting magnetic flux sensor based on a proximity josephson junction
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/4690751532e04c0fb6e343efce4c85ad
work_keys_str_mv	AT rnjabdaraghi noiseofasuperconductingmagneticfluxsensorbasedonaproximityjosephsonjunction AT dsgolubev noiseofasuperconductingmagneticfluxsensorbasedonaproximityjosephsonjunction AT jppekola noiseofasuperconductingmagneticfluxsensorbasedonaproximityjosephsonjunction AT jtpeltonen noiseofasuperconductingmagneticfluxsensorbasedonaproximityjosephsonjunction
_version_	1718388887532863488

Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction

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