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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doaj-2dacb4e9604b42e48af853cecd5427e42020-11-25T01:12:22ZengMDPI AGSensors1424-82202019-08-011917363510.3390/s19173635s19173635Fine-Tuning and Optimization of Superconducting Quantum Magnetic Sensors by Thermal AnnealingAntonio Vettoliere0Berardo Ruggiero1Massimo Valentino2Paolo Silvestrini3Carmine Granata4Institute of Applied Sciences and Intelligent Systems of National Research Council (CNR), 80078 Pozzuoli, ItalyInstitute of Applied Sciences and Intelligent Systems of National Research Council (CNR), 80078 Pozzuoli, ItalyInstitute of Applied Sciences and Intelligent Systems of National Research Council (CNR), 80078 Pozzuoli, ItalyDepartment of Mathematics and Physics, University of Campania “L. Vanvitelli”, 81100 Caserta, ItalyInstitute of Applied Sciences and Intelligent Systems of National Research Council (CNR), 80078 Pozzuoli, ItalyIn 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.https://www.mdpi.com/1424-8220/19/17/3635magnetic sensorsSQUIDsmagnetic field noiseannealing |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Antonio Vettoliere Berardo Ruggiero Massimo Valentino Paolo Silvestrini Carmine Granata |
spellingShingle |
Antonio Vettoliere Berardo Ruggiero Massimo Valentino Paolo Silvestrini Carmine Granata Fine-Tuning and Optimization of Superconducting Quantum Magnetic Sensors by Thermal Annealing Sensors magnetic sensors SQUIDs magnetic field noise annealing |
author_facet |
Antonio Vettoliere Berardo Ruggiero Massimo Valentino Paolo Silvestrini Carmine Granata |
author_sort |
Antonio Vettoliere |
title |
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_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_sort |
fine-tuning and optimization of superconducting quantum magnetic sensors by thermal annealing |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2019-08-01 |
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. |
topic |
magnetic sensors SQUIDs magnetic field noise annealing |
url |
https://www.mdpi.com/1424-8220/19/17/3635 |
work_keys_str_mv |
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