Kinetic inductance detectors (KIDs) show promise as a competitive technology for astronomical observations over a wide range of wavelengths. We are interested in comparing the fundamental limitations to the sensitivity of KIDs with that of transition edge sensors (TESs) at millimeter wavelengths, specifically over the wavelengths required for studies of the Cosmic Microwave Background (CMB). We...

We use the principles of cavity optomechanics to design a resonant mechanical force sensor for atomic microscopy. The is based on type electromechanical coupling, dual traditional capacitive whereby motion cantilever induces surface strain that causes change in kinetic inductance superconducting nanowire. realized by compact microwave-plasma mode with an equivalent $LC$ circuit involving device...

The applicabilty of superconductors to antennas is examined. Potential implementations that are examined are superdirective arrays; electrically small antennas; tuning and matching of these two; high-gain millimeter-wavelength arrays; and kinetic inductance slow wave structures for array phasers and traveling wave array feeds. Superdirective arrays and small antennas will not benefit directly, ...

* D Abstract --Lossless broad-band microwave active inductors for generalpurpose use in microwave circuits are proposed and their characteristics are discussed. These active inductors are composed of a common-source cascode FET and a feedback FET, and operate in a wide frequency range with very low series resistance. A maximum Q factor of 65 is obtained. Theoretically, it can reach infinity. Fu...

We propose a qubit-qubit coupling scheme for superconducting flux quantum bits (qubits), where a quantized Josephson junction resonator and microwave irradiation are utilized. The junction is used as a tunable inductance controlled by changing the bias current flowing through the junction, and thus the circuit works as a tunable resonator. This enables us to make any qubits interact with the re...

Superconducting parametric amplifiers are crucial components in microwave quantum circuits for enabling quantum-limited signal readout. The best-performing such often based on Josephson junctions, which however sensitive to magnetic fields. Therefore, they require shields and not easily integratable with other systems that operate within fields, as spin-ensemble memories. To tackle this challen...

We propose a novel experiment, the Canfranc Axion Detection Experiment (CADEx), to probe dark matter axions with masses in range 330-460 $\mu$eV, within W-band (80-110 GHz), an unexplored parameter space well-motivated window of Quantum ChromoDynamics (QCD) axions. The experimental design consists microwave resonant cavity haloscope high static magnetic field coupled highly sensitive detecting ...

Superconducting resonators used in millimeter-submillimeter astronomy would greatly benefit from deposited dielectrics with a small dielectric loss. We hydrogenated amorphous silicon films using plasma-enhanced chemical vapor deposition, at substrate temperatures of 100\deg C, 250\deg C and 350\deg C. The measured void volume fraction, hydrogen content, microstructure parameter, bond-angle diso...