Biharmonic-Drive Tunable Josephson Diode

The superconducting diode effect has garnered significant interest due to its prospective applications in cryogenic electronics and computing, enabling directional supercurrent transport. This phenomenon has been demonstrated across various superconducting platforms, which typically necessitate unconventional materials with broken spatial symmetries or external magnetic fields, posing scalability and integration challenges. This work introduces an innovative method to realize the superconducting diode effect by disrupting spatiotemporal symmetries in a conventional Josephson junction utilizing a biharmonic alternating-current (AC) drive signal. We achieve wireless modulation of the diode's polarity and efficiency with an antenna. Our findings indicate a diode efficiency reaching the ideal 100% over a broad frequency range, with a temperature resilience of up to 800 mK, and efficient AC signal rectification. This versatile and platform-independent superconducting diode signifies a promising component for advancing future superconducting digital electronics, including efficient logic gates, ultrafast switches, and dynamic half-wave supercurrent rectifiers.