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5–9 May 2025
ECT*
Europe/Rome timezone

Voltage-controlled synthesis of higher harmonics and 4e supercurrent in hybrid Josephson junction circuits

6 May 2025, 14:15
30m
Aula Renzo Leonardi (ECT*)

Aula Renzo Leonardi

ECT*

Strada delle Tabarelle 286, I-38123 Villazzano (Trento)
Talk

Speaker

Luca Banszerus (University of Vienna)

Description

Epitaxial semiconductor-superconductor hybrid materials provide a novel highly-tunable platform to study exotic emergent quantum phenomena, taking advantage of gate-controlled density, ballistic transport, and non-sinusoidal current-phase relations.
In my talk, I will introduce the hybrid Josephson rhombus, a highly tunable superconducting circuit element containing four semiconductor-superconductor hybrid Josephson junctions embedded in a loop. Combining magnetic frustration with gate-voltage-controlled tuning of individual Josephson couplings provides deterministic control of the harmonic content of the rhombus CPR. For balanced Josephson couplings at full frustration, the hybrid rhombus displays a pi-periodic Josephson potential, indicating coherent charge-4e transport. Tuning away from the balanced configuration, the device displays superconducting diode effect with efficiency exceeding 25%. These results showcase the potential of hybrid Josephson rhombi as fundamental building blocks for noise-resilient qubits and quantum devices with custom transport properties.

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