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Peltonen, J. T. (author), Coumou, P.C.J.J. (author), Peng, Z. (author), Klapwijk, T.M. (author), Tsai, J. S. (author), Astafiev, O. V. (author)We report development and microwave characterization of rf SQUID (Superconducting QUantum Interference Device) qubits, consisting of an aluminium-based Josephson junction embedded in a superconducting loop patterned from a thin film of TiN with high kinetic inductance. Here we demonstrate that the systems can offer small physical size, high...journal article 2018
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Coumou, P.C.J.J. (author), Driessen, E.F.C. (author), Bueno, J. (author), Chapelier, C. (author), Klapwijk, T.M. (author)We have studied the electrodynamic response of strongly disordered superconducting TiN films using microwave resonators, where the disordered superconductor is the resonating element in a high-quality superconducting environment of NbTiN. We describe the response assuming an effective pair-breaking mechanism modifying the density of states and...journal article 2013
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Driessen, E.F.C. (author), Coumou, P.C.J.J. (author), Tromp, R.R. (author), De Visser, P.J. (author), Klapwijk, T.M. (author)We probe the effects of strong disorder (2.4<kFl<8.6) on superconductivity in thin films of niobium titanium nitride and titanium nitride by measuring the microwave electrodynamics in coplanar waveguide resonators. We find a gradual evolution of the electromagnetic response with disorder, deviating from BCS theory, for both materials. This...journal article 2012