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Fine-Tuning and Optimization of Superconducting Quantum Magnetic Sensors by Thermal Annealing

In the present article, we present the experimental results concerning the fine-tuning and optimization of superconducting quantum interference device (SQUID) parameters by thermal annealing. This treatment allows for the modification of the parameters in order to meet a specific application or to a...

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Autores principales: Vettoliere, Antonio, Ruggiero, Berardo, Valentino, Massimo, Silvestrini, Paolo, Granata, Carmine
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6749513/
https://www.ncbi.nlm.nih.gov/pubmed/31438525
http://dx.doi.org/10.3390/s19173635
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author Vettoliere, Antonio
Ruggiero, Berardo
Valentino, Massimo
Silvestrini, Paolo
Granata, Carmine
author_facet Vettoliere, Antonio
Ruggiero, Berardo
Valentino, Massimo
Silvestrini, Paolo
Granata, Carmine
author_sort Vettoliere, Antonio
collection PubMed
description In the present article, we present the experimental results concerning the fine-tuning and optimization of superconducting quantum interference device (SQUID) parameters by thermal annealing. This treatment allows for the modification of the parameters in order to meet a specific application or to adjust the device parameters to prevent the increase of magnetic field noise and work instability conditions due to a different critical current with respect to the design value. In particular, we report the sensor critical current, the voltage–flux (V–Φ) characteristics and the spectral density of the magnetic field of SQUID magnetometers for different annealing temperatures. The measurements demonstrate that it is possible to achieve a fine control of the most important device parameters. In particular, we show that thermal annealing allows for the reduction of SQUID noise by more than a factor of 5 and makes the device working operations very stable. These results are very useful in view of quantum technology applications related to superconducting quantum computing where the correct functioning of the quantum bit depends on the fine control of the superconducting quantum device parameters and selectable annealing is possible by using a suitable laser as a thermal source.
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spelling pubmed-67495132019-09-27 Fine-Tuning and Optimization of Superconducting Quantum Magnetic Sensors by Thermal Annealing Vettoliere, Antonio Ruggiero, Berardo Valentino, Massimo Silvestrini, Paolo Granata, Carmine Sensors (Basel) Article In the present article, we present the experimental results concerning the fine-tuning and optimization of superconducting quantum interference device (SQUID) parameters by thermal annealing. This treatment allows for the modification of the parameters in order to meet a specific application or to adjust the device parameters to prevent the increase of magnetic field noise and work instability conditions due to a different critical current with respect to the design value. In particular, we report the sensor critical current, the voltage–flux (V–Φ) characteristics and the spectral density of the magnetic field of SQUID magnetometers for different annealing temperatures. The measurements demonstrate that it is possible to achieve a fine control of the most important device parameters. In particular, we show that thermal annealing allows for the reduction of SQUID noise by more than a factor of 5 and makes the device working operations very stable. These results are very useful in view of quantum technology applications related to superconducting quantum computing where the correct functioning of the quantum bit depends on the fine control of the superconducting quantum device parameters and selectable annealing is possible by using a suitable laser as a thermal source. MDPI 2019-08-21 /pmc/articles/PMC6749513/ /pubmed/31438525 http://dx.doi.org/10.3390/s19173635 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Vettoliere, Antonio
Ruggiero, Berardo
Valentino, Massimo
Silvestrini, Paolo
Granata, Carmine
Fine-Tuning and Optimization of Superconducting Quantum Magnetic Sensors by Thermal Annealing
title Fine-Tuning and Optimization of Superconducting Quantum Magnetic Sensors by Thermal Annealing
title_full Fine-Tuning and Optimization of Superconducting Quantum Magnetic Sensors by Thermal Annealing
title_fullStr Fine-Tuning and Optimization of Superconducting Quantum Magnetic Sensors by Thermal Annealing
title_full_unstemmed Fine-Tuning and Optimization of Superconducting Quantum Magnetic Sensors by Thermal Annealing
title_short Fine-Tuning and Optimization of Superconducting Quantum Magnetic Sensors by Thermal Annealing
title_sort fine-tuning and optimization of superconducting quantum magnetic sensors by thermal annealing
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6749513/
https://www.ncbi.nlm.nih.gov/pubmed/31438525
http://dx.doi.org/10.3390/s19173635
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