We are happy to announce that our latest work, “Coherent microwave comb generation via the Josephson effect,” has been published in Nature Communications (vol. 17, Article 2972, 2026).
The study, led by Angelo Greco, Xavier Ballu, Francesco Giazotto, and Alessandro Crippa, demonstrates a new way to generate coherent microwave frequency combs using a superconducting quantum interference device (SQUID). By applying a time-dependent magnetic drive, the device produces periodic voltage pulses that translate into a frequency comb spanning dozens of spectral modes — up to the 46th harmonic — within the 4–8 GHz range.
Unlike optical frequency combs, which are already a mature technology, this approach exploits superconducting circuits to create a low-dissipation, chip-scale comb generator. Thanks to its micrometer-scale footprint and minimal power dissipation, the device is well suited for integration with advanced cryogenic electronics — opening the door to translating established optical techniques into the solid-state domain for future quantum technology applications.
Read the full article: Coherent microwave comb generation via the Josephson effect (open access)