The Andreev bound state spectra of multi-terminal Josephson junctions form an artificial band structure, which is predicted to host tunable topological phases under certain conditions. However, the number of conductance modes between the terminals of multi-terminal Josephson junction must be few in order for this spectrum to be experimentally accessible. In this work we employ a quantum point contact geometry in three-terminal Josephson devices. We demonstrate independent control of conductance modes between each pair of terminals and access to the single-mode regime coexistent with the presence of superconducting coupling. These results establish a full platform on which to realize tunable Andreev bound state spectra in multi-terminal Josephson junctions.
@article{arxiv.2201.01373,
title = {Selective Control of Conductance Modes in Multi-terminal Josephson Junctions},
author = {Gino V. Graziano and Mohit Gupta and Mihir Pendharkar and Jason T. Dong and Connor P. Dempsey and Chris Palmstrøm and Vlad S. Pribiag},
journal= {arXiv preprint arXiv:2201.01373},
year = {2022}
}