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Title: Nanoscale constrictions in superconducting coplanar waveguide resonators

We report on the design, fabrication, and characterization of superconducting coplanar waveguide resonators with nanoscopic constrictions. By reducing the size of the center line down to 50 nm, the radio frequency currents are concentrated and the magnetic field in its vicinity is increased. The device characteristics are only slightly modified by the constrictions, with changes in resonance frequency lower than 1% and internal quality factors of the same order of magnitude as the original ones. These devices could enable the achievement of higher couplings to small magnetic samples or even to single molecular spins and have applications in circuit quantum electrodynamics, quantum computing, and electron paramagnetic resonance.
Authors:
; ; ; ;  [1] ;  [2] ;  [3] ;  [2] ; ;  [4] ;  [5] ;  [6]
  1. Instituto de Ciencia de Materiales de Aragón, CSIC—Universidad de Zaragoza, 50009 Zaragoza (Spain)
  2. (Spain)
  3. Instituto de Nanociencia de Aragón, Universidad de Zaragoza, E-50009 Zaragoza (Spain)
  4. Department of Physics, University of Central Florida, Orlando, Florida 32816 (United States)
  5. Dpto. de Ingeniería Electrónica y Telecomunicaciones, Universidad de Zaragoza, 50009 Zaragoza (Spain)
  6. Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna (Austria)
Publication Date:
OSTI Identifier:
22350964
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 16; Other Information: (c) 2014 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; COUPLINGS; CURRENTS; ELECTRON SPIN RESONANCE; MAGNETIC FIELDS; NANOSTRUCTURES; QUALITY FACTOR; QUANTUM COMPUTERS; QUANTUM ELECTRODYNAMICS; RADIOWAVE RADIATION; RESONATORS; SPIN; SUPERCONDUCTING DEVICES; WAVEGUIDES