Sensors, Vol. 19, Pages 3635: Fine-Tuning and Optimization of Superconducting Quantum Magnetic Sensors by Thermal Annealing

Sensors, Vol. 19, Pages 3635: Fine-Tuning and Optimization of Superconducting Quantum Magnetic Sensors by Thermal Annealing
Sensors doi: 10.3390/s19173635
Authors:
Antonio Vettoliere
Berardo Ruggiero
Massimo Valentino
Paolo Silvestrini
Carmine Granata

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 devic...

Source: Sensors - August 20, 2019 Category: Biotechnology Authors: Antonio Vettoliere Berardo Ruggiero Massimo Valentino Paolo Silvestrini Carmine Granata Tags: Article Source Type: research