Dresden 2020 – wissenschaftliches Programm

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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 CircuitYannick 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. Ustinov1,5,61Physikalisches 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.

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