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TT: Fachverband Tiefe Temperaturen
TT 31: Superconducting Electronics: SQUIDs, Qubits, Circuit QED, Quantum Coherence and Quantum Information Systems 1
TT 31.11: Vortrag
Mittwoch, 18. März 2020, 12:15–12:30, HSZ 03
Rabi Oscillations in a Superconducting Nanowire Circuit — Yannick Schön1, •Maximilian Kristen1, Jan Nicolas Voss1, Micha Wildermuth1, Andre Schneider1, Sebastian T. Skacel1, Martin P. Weides1,3, Jared H. Cole4, Hannes Rotzinger1,2, and Alexey V. Ustinov1,5,6 — 1Physikalisches Institut, Karlsruher Institut für Technologie, Karlsruhe, Germany — 2Institut für Festkörperphysik, Karlsruher Institut für Technologie, Karlsruhe, Germany — 3University of Glasgow, Glasgow, United Kingdom — 4RMIT University, Melbourne, Australia — 5National University of Science and Technology MISIS, Moscow, Russia — 6Russian Quantum Center, Skolkovo, Moscow, Russia
Disordered oxidized (granular) aluminum is a new material for superconducting quantum circuits, featuring not only a very high kinetic inductance but also microwave resonators with high quality factors. Applied to wires of nanometer scale it allows for a pronounced nonlinear microwave response.
We investigate the circuit quantum electrodynamics of superconducting nanowire oscillators. The sample circuit consists of a capacitively shunted nanowire with a width of about 20 nm and a varying length up to 350 nm, capacitively coupled to an on-chip resonator. By applying microwave pulses we observe Rabi oscillations, measure coherence times and the anharmonicity of the circuit. Despite the very compact design, simple top-down fabrication and high degree of disorder in the granular aluminum material, we observe lifetimes in the microsecond range.