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Edge states of topological systems have attracted great interest due to theirrobustness and linear dispersions. Here a superconducting-proximitized edgeinterferometer is engineered on a second-order topological insulator Ta2Pd3Te5with asymmetric edges to realize the interfering Josephson diode effect (JDE),which hosts many advantages, such as the high efficiency as much as 73% at tinyapplied field 8.4 mT an ultra-low switching power around picowatt, and a giantinterfering magnetochiral anisotropy with a coefficient $\gamma$ = 1.2 $\times10^9$ T$^{-1}$A$^{-1}$ - three orders of magnitude larger than the reportedrecord. As an important element to induce such JDE, the second-order harmonicin the current-phase relation is also experimentally confirmed by half Shapirosteps. This edge interferometer offers a novel and effective method to enhancethe overall performance of JDE and magnetochiral anisotropy, and boosts greatpotential application for future superconducting quantum devices.

Interfering Josephson diode effect and magnetochiral anisotropy in Ta2Pd3Te5 asymmetric edge interferometer