This paper presents a SQUID-based quantum sensor for ultra-sensitive magnetic field detection, comprising a two-stage architecture utilizing the DC SQUID as a front-end sensor as well as for the Josephson Parametric Amplifier (JPA) in the second stage. The work details the circuit design and characteristics of the DC SQUID, introduces the challenges associated with high-frequency sensing, and analyzes the nonlinear behavior in the superconducting region crucial for ultra-sensitive detection. Furthermore, it demonstrates the gain enhancements achieved through the parametric amplifier and establishes a good match between device measurement results and the behavioral model.This paper presents a SQUID-based quantum sensor for ultra-sensitive magnetic field detection, comprising a two-stage architecture utilizing the DC SQUID as a front-end sensor as well as for the Josephson Parametric Amplifier (JPA) in the second stage. The work details the circuit design and characteristics of the DC SQUID, introduces the challenges associated with high-frequency sensing, and analyzes the nonlinear behavior in the superconducting region crucial for ultra-sensitive detection. Furthermore, it demonstrates the gain enhancements achieved through the parametric amplifier and establishes a good match between device measurement results and the behavioral model.

IEEE International Conference on Quantum Computing and Engineering (QCE)Sep 15, 20242 citations

DC SQUID AND ITS LOW-FREQUENCY APPLICATIONS

Heikki Seppä, Tapani Ryhänen, Risto Juhani Ilmoniemi +1 more

WORLD SCIENTIFIC eBooksJul 1, 19910 citations

Amplification by Frequency Transposition with a Low Critical Temperature DC SQUID

Olivier Hubert, Yves Monfort, Jacques Lepaisant +2 more

The performances of a heterodyne amplifier involving a DC SQUID have been modelised and measured. This type of amplification is derived from frequency translation methods using flux modulation. The pump frequency used depends on the signal to be analysed and the translation to a fixed frequency f0 is carried out by the SQUID which is a nonlinear device. Such a system simplifies the impedance matching between the SQUID and the semiconductor preamplifier and can be operated as a spectrum analyser for signals of relatively high and variable frequency. Flux sensitivities of 5 to 10 $\mu\Phi_{0}/\sqrt{\rm Hz}$ have been measured in this configuration for frequencies ranging from 200 kHz to 2 MHz. In order to validate our model, the flux sensitivity of the SQUID in the heterodyne configuration has been compared to that given by direct measurements at the intermediate frequency f0. Our measurements are in good agreement with a theoretical model based on a simplified voltage to flux characteristic of the DC SQUID.The performances of a heterodyne amplifier involving a DC SQUID have been modelised and measured. This type of amplification is derived from frequency translation methods using flux modulation. The pump frequency used depends on the signal to be analysed and the translation to a fixed frequency f0 is carried out by the SQUID which is a nonlinear device. Such a system simplifies the impedance matching between the SQUID and the semiconductor preamplifier and can be operated as a spectrum analyser for signals of relatively high and variable frequency. Flux sensitivities of 5 to 10 $\mu\Phi_{0}/\sqrt{\rm Hz}$ have been measured in this configuration for frequencies ranging from 200 kHz to 2 MHz. In order to validate our model, the flux sensitivity of the SQUID in the heterodyne configuration has been compared to that given by direct measurements at the intermediate frequency f0. Our measurements are in good agreement with a theoretical model based on a simplified voltage to flux characteristic of the DC SQUID.

Journal de Physique IIIJan 1, 19960 citations

\mu\Phi_{0}/\sqrt{\rm Hz}

have been measured in this configuration for frequencies ranging from 200 kHz to 2 MHz. In order to validate our model, the flux sensitivity of the SQUID in the heterodyne configuration has been compared to that given by direct measurements at the intermediate frequency f0. Our measurements are in good agreement with a theoretical model based on a simplified voltage to flux characteristic of the DC SQUID.