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Multiplet Supercurrents in a Josephson Circuit.

Ethan G Arnault¹, John Chiles¹, Trevyn F Q Larson¹

¹Duke University, Department of Physics, Durham, North Carolina 27701, USA.

Physical Review Letters

|February 28, 2025

Summary

This summary is machine-generated.

Researchers explored multiterminal Josephson circuits, demonstrating robust multiplet supercurrents and discovering a novel supercurrent. This work opens new avenues for studying nonlinear, quantum, and topological physics.

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Area of Science:

Condensed Matter Physics
Quantum Information Science

Background:

Multiterminal Josephson circuits are investigated for hosting synthetic topological phases, Floquet states, and multiplet supercurrents.
These circuits involve superconducting electrodes connected via Josephson junctions to a common island.

Purpose of the Study:

To explore the dynamic generation of multiplet supercurrents in a three-terminal Josephson circuit.
To investigate a novel supercurrent phenomenon in voltage-biased contacts.
To understand the underlying phase dynamics and potential applications in quantum physics.

Main Methods:

Fabrication and characterization of a three-terminal Josephson circuit.
Experimental demonstration of dynamic supercurrent generation.
Microwave drive application to observe Shapiro step quantization.
Analysis of phase dynamics synchronization.

Main Results:

Successful dynamic generation of multiplet supercurrents, robust to elevated temperatures.
Confirmation of supercurrents via Shapiro step quantization under microwave drive.
Discovery of a novel supercurrent coupling two voltage-biased contacts.
Attribution of the novel supercurrent to synchronized phase dynamics.

Conclusions:

The study confirms the feasibility of generating robust multiplet supercurrents in Josephson circuits.
A novel supercurrent mechanism driven by phase dynamics synchronization is identified.
These findings provide new pathways for exploring the interplay of nonlinear, quantum, and topological physics.