Development of flux-tuneable inductive nanobridge SQUIDs for quantum technology applications

Niobium nanobridge SQUIDs have shown exceptional noise performance with potential applications in quantum information processing, weak signal detection and single spin where the geometry should enable efficient electromagnetic coupling to implanted spins. Combining such devices dispersive microwave readout circuitry allows sensitivity be further improved by overcoming standard thermal limit. Here we report on fabrication of an array niobium rf incorporated into a superconducting resonator, including optimization process electron beam lithography. We show measured flux-tuneability resonance is good agreement theory, also discuss how nonlinearity weak-link resonator structure for mediation parametric effects enhance performance.