Josephson diode effect derived from short-range coherent coupling

Typical superconducting materials have both time-reversal symmetry and inversion symmetry. Devices that break these symmetries are expected to have exotic phenomena such as the superconducting diode effect, which can provide lossless rectification. Here, we present a device comprising one Josephson junction coupled to another that exhibits the superconducting diode effect. We show that the observed effect can be controlled non-locally based on the phase difference of the adjacent junction. These results indicate that the time-reversal and spatial-inversion symmetries of a Josephson junction are broken by the coherent coupling to an adjacent junction, and this enables the engineering of superconducting phenomena mediated by interaction among Josephson junctions.