Nanometric constrictions in superconducting coplanar waveguide resonators

Mark David Jenkins; Uta Naether; Miguel Ciria; Javier Sesé; James Atkinson; Carlos Sánchez-Azqueta; Enrique del Barco; Johannes Majer; David Zueco; Fernando Luis

doi:10.1063/1.4899141

arXiv · 1409.1040

Nanometric constrictions in superconducting coplanar waveguide resonators

Mark David Jenkins·Uta Naether·Miguel Ciria·Javier Sesé·James Atkinson·Carlos Sánchez-Azqueta·Enrique del Barco·Johannes Majer·David Zueco·Fernando Luis

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Abstract

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.

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Mark David Jenkins, Uta Naether, Miguel Ciria, Javier Sesé, James Atkinson, Carlos Sánchez-Azqueta, Enrique del Barco, Johannes Majer, David Zueco, Fernando Luis. 2014-09-03. Nanometric constrictions in superconducting coplanar waveguide resonators. https://doi.org/10.1063/1.4899141

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