Nature Physics, Published online: 11 December 2025; doi:10.1038/s41567-025-03118-x
An electrical method is shown to reliably introduce nonreciprocal behaviour across a Josephson junction made of high-temperature cuprate superconductors, which then, under microwave irradiation, forms a ‘quantum superconducting diode’. The device is magnetic-field-free, works at a temperature of 77 K with a diode efficiency of 100%, and, owing to Shapiro steps that quantize the output voltage, has robust noise-filtering.
