Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 99: Poster Session: Transport
TT 99.40: Poster
Donnerstag, 15. März 2018, 15:00–19:00, Poster B
Design considerations for a superconducting granular aluminum nano-wire qubit — •Yannick Schön1, Jan Nicolas Voss1, Sebastian T. Skacel1, Alexander Stehli1, Jochen Braumüller1, Martin Weides1, Hannes Rotzinger1, and Alexey V. Ustinov1,2 — 1Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany — 2Russian Quantum Center, National University of Science and Technology MISIS, Moscow 119049, Russia
At feature sizes of nano-meter scale, superconducting wires made from a material with a high normal conducting sheet resistance show a pronounced non-linear microwave response. If such a nano-wire is embedded in a self-resonating circuit, the non-linearity can be observed even at very low photon numbers. Unfortunately, these materials often show a rather high photon loss, which makes them unusable for long lived quantum circuits.
Granular aluminium is a new material for superconducting quantum circuits which features not only a very high kinetic inductance but also high quality factors. [1] To explore the potential of nano-wires fabricated from granular aluminium, we propose a new type of superconducting qubit. Replacing the Josephson tunnel junction in a transmon qubit, the granular aluminium nano-wire is operated in a high-impedance Josephson weak-link regime. We present design considerations and preliminary measurements of first samples.
[1] H. Rotzinger, et al., Supercond. Sci. Technol. 30, 025002 (2016)