SKM 2023 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 57: Poster: Superconductivity I

TT 57.24: Poster

Thursday, March 30, 2023, 15:00–18:00, P2/OG2

On-chip driving of a phase-slip junction for dual Shapiro steps — •David Scheer and Fabian Hassler — JARA Institute for Quantum Information, RWTH Aachen University, 52056 Aachen, Germany

A single Josephson junction in the phase-slip regime exhibits Bloch oscillations that relate current to frequency if supplied with a DC voltage-bias. If additionally an AC-drive is applied to the junction, the Bloch oscillations can synchronize with the driving frequency. This leads to the emergence of dual Shapiro steps with constant current in the IV-curve of the junction with the current determined by the driving frequency. An AC-drive in the required frequency regime of > 10GHz is challenging to implement experimentally without detrimental effects due to stray capacitances. We investigate the use of a Josephson junction with a DC-bias as an on-chip AC-voltage source. We discuss the relevant coupling parameters between the oscillations caused by the DC-Josephson effect and the Bloch oscillations as well as the back action of the Bloch oscillations on the Josephson oscillations. We identify the regime in which the back action is minimized in order to obtain a steady voltage source to create dual Shapiro steps.