  Edge states in topological systems have attracted great interest due to their
robustness and linear dispersions. Here a superconducting-proximitized edge
interferometer is engineered on a topological insulator Ta2Pd3Te5 with
asymmetric edges to realize the interfering Josephson diode effect (JDE), which
hosts many advantages, such as the high efficiency as much as 73% at tiny
applied magnetic fields with an ultra-low switching power around picowatt, and
a giant interfering magnetochiral anisotropy with a maximal coefficient gamma =
1.2 x 10^{9} T^{-1}A^{-1}. As an important element to induce such JDE, the
second-order harmonic in the current-phase relation is also experimentally
confirmed by half-integer Shapiro steps. This edge interferometer offers a
novel and effective method to enhance the overall performance of JDE and
magnetochiral anisotropy, and boosts great potential applications for future
superconducting quantum devices.
