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This paper demonstrates a concept of nonequilibrium Josephson diode effect in a symmetric superconducting interferometer. Driven out of equilibrium by a dissipative current in the normal region, this system exhibits nonreciprocal supercurrents without needing broken inversion symmetry. The authors show this effect can exceed its ideal value, creating a ``supra-perfect'' diode that allows supercurrent to flow in only one direction above a certain threshold
Shaffer et al. (2025) studied this question.