We carry out a quantum analysis of a dc superconducting quantum interference device SQUID mechanical displacement detector, comprising a SQUID with mechanically compliant loop segment, which is embedded in a microwave transmission line resonator. The SQUID is approximated as a nonlinear current-dependent inductance, inducing an external flux tunable nonlinear Duffing self-interaction term in th...

We report on the realization of a superinductor, a dissipationless element whose microwave impedance greatly exceeds the resistance quantum R(Q). The design of the superinductor, implemented as a ladder of nanoscale Josephson junctions, enables tuning of the inductance and its nonlinearity by a weak magnetic field. The Rabi decay time of the superinductor-based qubit exceeds 1 μs. The high kine...

We present the design, manufacturing, and testing of a 37-element array corrugated feedhorns for Cosmic Microwave Background (CMB) measurements between $140$ $170$ GHz. The was designed to be coupled Kinetic Inductance Detector arrays, either directly (for total power measurements) or through an orthomode transducer polarization measurements). manufactured in platelets by chemically etching alu...

We are starting to investigate a novel multiplexable readout method that can be applied to a large class of superconducting pair-breaking detectors. This readout method is completely different from those currently used with STJ and TES detectors, and in principle could deliver large pixel counts, high sensitivity, and Fano-limited spectral resolution. The readout is based on the fact that the k...

Microwave photonics is a remarkably powerful system for quantum simulation and technologies, but its integration in superconducting circuits, superior many aspects, constrained by the long wavelengths impedance mismatches this platform. We introduce solution to these difficulties via compact networks of high-kinetic inductance microstrip waveguides coupling wires with strongly reduced phase vel...