Direct Observations of the 500 MHz Q-Patterns from the 10 and 35 GHz SQUID's

The 500 MHz Quantum Interference patterns (Q-patterns) beyond 100 MHz previously reported have been directly observed for the first time from 10 and 35 GHz Superconducting Quantum Interference Devices (SQUID's). The observation was made by improving the bandwidth of the detection circuits, which was supposed to be the cause of the previous limitation on Q-patterns from the 10 and 35 GHz SQUID's. An improved system including a 10 or 35 GHz SQUID has possible applications to the measurement of signals due to even faster magnetic flux changes.