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TT: Fachverband Tiefe Temperaturen

TT 11: Superconductivity: Poster

TT 11.31: Poster

Montag, 17. März 2025, 15:00–18:00, P4

Charge Sensitivity of a Quantum Phase Slip Transistor — •Marius Frohn¹, Jan Nicolas Voss¹, Hannes Rotzinger^1,2, and Alexey Ustinov^1,2 — ¹Physikalisches Institut, Karlsruher Institut für Technologie, Karlsruhe, Germany — ²Institut für Quantenmaterialien und Technologien (IQMT), Karlrsruher Institut für Technologie, Karlsruhe, Germany

Superconducting quantum phase slip (QPS) devices are high-impedance circuits that are promising for quantum sensing applications or the realisation of a current standard. For example, the QPS transistor is a dual circuit to the SQUID and is therefore sensitive to charge rather than flux. We study QPS transistors fabricated from two strongly coupled granular aluminium nanowires. This allows us to use intrinsic electromigration[1] to fine-tune the Coulomb blockade voltage in situ. The current-voltage characteristics at different gate biases and wire resistances provide insight into the charge sensitivity and operating range of the QPS transistor. We present the results of experiments on superconducting nanowire circuits at mK temperatures.

[1] J. N. Voss, Y. Schön, M. Wildermuth, D. Dorer, J. H. Cole, H. Rotzinger and A. V. Ustinov, ACS Nano 15 (2021)

Keywords: Quantum Phase Slips; Nanowire; Transistor; Granular Aluminium; High impedance material