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Title: Frequency-tunable superconducting resonators via nonlinear kinetic inductance

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 injecting a DC through a current-directing circuit into the nonlinear inductor whose kinetic inductance is current-dependent. We have demonstrated continuous tuning of the resonance frequency in a 180 MHz frequency range around 4.5 GHz while maintaining the high internal quality factor Q{sub i} > 180 000. This device may serve as a tunable filter and find applications in superconducting quantum computing and measurement. It also provides a useful tool to study the nonlinear response of a superconductor. In addition, it may be developed into techniques for measurement of the complex impedance of a superconductor at its transition temperature and for readout of transition-edge sensors.
Authors:
; ; ;  [1] ;  [2] ;  [3]
  1. National Institute of Standards and Technology, Boulder, Colorado 80305 (United States)
  2. Department of Physics, Stanford University, Stanford, California 94305 (United States)
  3. Department of Physics, University of California, Santa Barbara, California 93106 (United States)
Publication Date:
OSTI Identifier:
22489091
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DESIGN; DIRECT CURRENT; FILMS; FILTERS; GHZ RANGE 01-100; INDUCTANCE; MHZ RANGE 100-1000; NIOBIUM; NONLINEAR PROBLEMS; QUALITY FACTOR; QUANTUM COMPUTERS; READOUT SYSTEMS; RESONATORS; SOLENOIDS; SUPERCONDUCTORS; TITANIUM; TRANSITION TEMPERATURE