246 citations · 1.6k across the 27 of their papers we have counts for
7 papers · 1 filter
Long-lived, radiation-suppressed superconducting quantum bit in a planar geometry
Martin Sandberg, Michael R. Vissers, Tom Ohki +4
We present a superconducting qubit design that is fabricated in a 2D geometry over a superconducting ground plane to enhance the lifetime. The qubit is coupled to a microstrip reso…
Proximity-Coupled Ti/TiN Multilayers for use in Kinetic Inductance Detectors
Michael R. Vissers, Jiansong Gao, Martin Sandberg +4
We apply the superconducting proximity effect in TiN/Ti multi-layer films to tune the critical temperature, Tc, to within 10 mK with high uniformity (less than 15 mK spread) across…
Characterization and In-situ Monitoring of Sub-stoichiometric Adjustable Tc Titanium Nitride Growth
Michael R. Vissers, Jiansong Gao, Jeffrey S. Kline +4
The structural and electrical properties of Ti-N films deposited by reactive sputtering depend on their growth parameters, in particular the Ar:N2 gas ratio. We show that the nitro…
A titanium-nitride near-infrared kinetic inductance photon-counting detector and its anomalous electrodynamics
J. Gao, M. R. Visser, M. O. Sandberg +10
We demonstrate single-photon counting at 1550 nm with titanium-nitride (TiN) microwave kinetic inductance detectors. Energy resolution of 0.4 eV and arrival-time resolution of 1.2…
Etch Induced Microwave Losses in Titanium Nitride Superconducting Resonators
Martin Sandberg, Michael R. Vissers, Jeffrey S. Kline +4
We have investigated the correlation between the microwave loss and patterning method for coplanar waveguide titanium nitride resonators fabricated on Si wafers. Three different me…
Identifying capacitive and inductive loss in lumped element superconducting hybrid titanium nitride/aluminum resonators
Michael R. Vissers, Martin P. Weides, Jeffrey S. Kline +2
We present a method to systematically locate and extract capacitive and inductive losses in superconducting resonators at microwave frequencies by use of mixed-material, lumped ele…