60 citations · 268 across the 15 of their papers we have counts for
15 papers
Film-thickness dependence of 10 GHz Nb coplanar-waveguide resonators
Kunihiro Inomata, Tsuyoshi Yamamoto, Michio Watanabe +2
We have studied Nb lambda/2 coplanar-waveguide (CPW) resonators whose resonant frequencies are 10-11 GHz. The resonators have different film thicknesses, t=0.05, 0.1, 0.2, and 0.3…
Power-dependent internal loss in Josephson bifurcation amplifiers
Michio Watanabe, Kunihiro Inomata, Tsuyoshi Yamamoto +1
We have studied nonlinear superconducting resonators: lambda/2 coplanar-waveguide (CPW) resonators with Josephson junctions (JJs) placed in the middle and lambda/4 CPW resonators t…
Flux-driven Josephson parametric amplifier
T. Yamamoto, K. Inomata, M. Watanabe +5
We have developed a Josephson parametric amplifier, comprising a superconducting coplanar waveguide resonator terminated by a dc SQUID (superconducting quantum interference device)…
Single-electron transistors in electromagnetic environments
Michio Watanabe
The current-voltage (I-V) characteristics of single-electron transistors (SETs) have been measured in various electromagnetic environments. Some SETs were biased with one-dimension…
Circuit with small-capacitance high-quality Nb Josephson junctions
Michio Watanabe, Yasunobu Nakamura, Jaw-Shen Tsai
We have developed a fabrication process for nanoscale tunnel junctions which includes focused-ion-beam etching from different directions. By applying the process to a Nb/(Al-)Al_2O…
Small-Capacitance Josephson Junctions: One-Dimensional Arrays and Single Junctions
Michio Watanabe, David B. Haviland
We review experiments on small-capacitance Josephson junctions. When the Josephson junction is fabricated in the configuration of dc superconducting quantum interference device (SQ…