Superconducting diode effect in graphene-based multi-terminal Josephson junctions

Reciprocal superconducting devices show a symmetric critical current for opposite current directions. By simultaneously breaking time-reversal and inversion symmetry, one can engineer a non-reciprocal superconducting diode effect (SDE). This effect has been experimentally demonstrated in two dimensional van der Waals heterostructures and systems with magneto-chiral anisotropy. In this work, we report a tunable magnetic-field-free SDE arising from circuit network effects in graphene-based multi-terminal Josephson junctions (MTJJs). We observe the SDE between two of the terminals when a non-zero current is applied to a third terminal. We further demonstrate voltage rectification with a pulsed current realizing a superconducting diode efficiency up to 100%.