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Article: Research from K. Cicak and colleagues has provided new data on applied superconductivity.
- Article from:
- Electronics Newsweekly
- Article date:
- August 26, 2009
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According to a study from the United States, "Low-loss microwave components are used in many superconducting resonant circuits from multiplexed readouts of low-temperature detector arrays to quantum bits. Two-level system defects in amorphous dielectric materials cause excess energy loss."
"In an effort to improve capacitor components, we have used optical lithography and micromachining techniques to develop superconducting parallel-plate capacitors in which lossy dielectrics are replaced by vacuum gaps. Resonance measurements at 50 mK on lumped LC circuits that incorporate these vacuum-gap capacitors (VGCs) reveal loss tangents at low powers as low as 4 x 10(-5) ...