Noise scaling in SQUID arrays

Abstract

We numerically investigate the noise scaling in high-Tc commensurate 1D and 2D SQUID arrays. We show that the voltage noise spectral density in 1D arrays violates the scaling rule of ~1/Np for the number Np of Josephson junctions in parallel. In contrast, in 2D arrays with Ns 1D arrays in series, the voltage noise spectral density follows more closely the expected scaling behaviour of ~Ns/Np. Additionally, we reveal how the flux and magnetic field rms noise spectral densities deviate from their expected ~(NsNp)^(-1/2) scaling and discuss their implications for designing low noise magnetometers.

References in corpus (7)

• High-gain weakly nonlinear flux-modulated Josephson parametric amplifier using a SQUID-array
• Disorder Effects in Superconducting Multiple Loop Quantum Interferometers
• High-Tc superconducting detector for highly-sensitive microwave magnetometry
• A theoretical model for parallel SQUID arrays with fluxoid focussing
• Modelling the transfer function of two-dimensional SQUID and SQIF arrays with thermal noise
• The role of coupling radius in 1D and 2D SQUID and SQIF arrays
• Effect of junction critical current disorder in superconducting quantum interference filter arrays