Abbreviated Journal Title
Appl. Phys. Lett.
CIRCUIT QUANTUM ELECTRODYNAMICS; QUBIT; Physics, Applied
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.
Applied Physics Letters
Jenkins, Mark David; Naether, Uta; Ciria, Miguel; Sesé, Javier; Atkinson, James; Sánchez-Azqueta, Carlos; del Barco, Enrique; Majer, Johannes; Zueco, David; and Luis, Fernando, "Nanoscale constrictions in superconducting coplanar waveguide resonators" (2014). Faculty Bibliography 2010s. 5513.