Regensburg 2016 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 5: Transport: Quantum Coherence and Quantum Information Systems - Experiment
(Joint session of HL, MA and TT organized by TT)

TT 5.10: Talk

Monday, March 7, 2016, 12:30–12:45, H22

Microwave experiments with quantum phase-slip in superconducting AlO_x nanowires — •Sebastian T. Skacel¹, Marco Pfirrmann¹, Jan N. Voss¹, Micha Wildermuth¹, Julian Münzberg¹, Lucas Radtke¹, Sebastian Probst¹, Martin Weides^1,2, J. E. Mooij^1,3, Hannes Rotzinger¹, and Alexey V. Ustinov¹ — ¹Physikalisches Institut, Karlsruher Institut für Technologie, D-76131 Karlsruhe, Germany — ²Institute of Physics, Johannes Gutenberg University Mainz, D-55128 Mainz, Germany — ³Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands

Superconducting nanowires in the quantum phase slip (QPS) regime allow to study the flux and phase dynamics in duality to Josephson junction systems. We experimentally study QPS effects of nanowires which are embedded in a resonant microwave circuit. The samples are probed at ultra-low microwave power and applied magnetic field at mK temperatures. The AlO_x nanowires, with a sheet resistance in the kΩ range, are fabricated by sputter deposition of aluminium in a controlled oxygen atmosphere. The wires are defined with conventional electron beam lithography into hydrogen silsesquioxane (HSQ) down to a width of 15-30 nm.
We present the single layer process fabrication and measurements of nanowires galvanically coupled to a superconducting lumped element microwave resonator.