|We present experimental results on microwave intermodulation measurements on a High Tc Superconducting band-reject microstrip resonator which exhibits unconventional 2:1 intermodulation products. We discuss unusual features of this 2:1 behavior that are uncovered by detailed frequency swept and unbalanced power measurements. We also introduce a phenomenological theory which arises from a nonli...

Single-photon detection is a requisite technique in quantum-optics experiments in both the optical and the microwave domains. However, the energy of microwave quanta are four to five orders of magnitude less than their optical counterpart, making the efficient detection of single microwave photons extremely challenging. Here we demonstrate the detection of a single microwave photon propagating ...

Abstract The Summertime Line Intensity Mapper (SLIM) is a mm-wave line-intensity mapping (mm-LIM) experiment for the South Pole Telescope (SPT). goal of SPT-SLIM to serve as technical and scientific pathfinder demonstration suitability in-field performance multi-pixel superconducting filterbank spectrometers future mm-LIM experiments. Scheduled deploy in 2023-24 austral summer, focal plane will...

The necessity to increase exposure in rare event search experiments by maintaining a low energy threshold and good resolution leads segmented detectors as EDELWEISS (Dark Matter), CUORE (0 $$\nu \beta \beta$$ ) or Ricochet (CENNS) for example. However, the large number of sub-elements can dramatically complexity such detector arrays. In this work we report on our progress towards designing flex...

We have succeeded in the first demonstration of a simple and accurate resonator-superconducting quantum interference device (SQUID) coupling for microwave SQUID multiplexers. A simple theory shows our direct coupling with adjustable fractional inductance in the SQUID loop can decrease the deviation of resonance frequencies from designed values in contrast to a conventional inductive coupling. O...

Developing compact, low-dissipation, cryogenic-compatible microwave electronics is essential for scaling up low-temperature quantum computing systems. In this paper, we demonstrate an ultracompact directional forward coupler based on high-impedance slow-wave superconducting-nanowire transmission lines. The coupling section of the fabricated device has a footprint $416\phantom{\rule{0.2em}{0ex}}...