246 citations · 1.6k across the 27 of their papers we have counts for
12 papers · 1 filter
Frequency-tunable Superconducting Resonators via Nonlinear Kinetic Inductance
Michael R. Vissers, Johannes Hubmayr, Martin Sandberg +3
We have designed, fabricated and tested a frequency-tunable high-Q superconducting resonator made from a niobium titanium nitride film. The frequency tunability is achieved by inje…
Ultra-Broadband Microwave Frequency-Comb Generation in Superconducting Resonators
R. P. Erickson, M. R. Vissers, M. Sandberg +2
We have generated frequency combs spanning 0.5 to 20 GHz in superconducting half wave resonators at T=3 K. Thin films of niobium-titanium nitride enabled this development due to th…
The pumpistor: a linearized model of a flux-pumped SQUID for use as a negative-resistance parametric amplifier
K. M. Sundqvist, S. Kintaş, M. Simoen +4
We describe a circuit model for a flux-driven SQUID. This is useful for developing insight into how these devices perform as active elements in parametric amplifiers. The key conce…
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…
Coherence in a transmon qubit with epitaxial tunnel junctions
Martin P. Weides, Jeffrey S. Kline, Michael R. Vissers +5
We developed transmon qubits based on epitaxial tunnel junctions and interdigitated capacitors. This multileveled qubit, patterned by use of all-optical lithography, is a step towa…
In-situ frequency tuning of photons stored in a high Q microwave cavity
M. Sandberg, C. M. Wilson, F. Persson +4
Photons are fundamental excitations of the electromagnetic field and can be captured in cavities. For a given cavity with a certain size, the fundamental mode has a fixed frequency…
Superconducting quantum interference phenomenon in BiSrCaCuO single crystals
M. Sandberg, V. M. Krasnov
The operational dc-SQUID based on intrinsic Josephson junctions in BiSrCaCu2O high- superconductor is fabricated and studied. The novel in-plane loop layout an…