Abstract
We have developed a technique to modulate the input to a superconducting quantum interference device (SQUID) using a very low noise double-pole, double-throw switching network. This network is composed of four niobium microbridges that are driven normal in pairs by pulses of laser light. An input signal is modulated at a frequency above the 1/f noise regime, amplified by the SQUID, and subsequently demodulated to obtain an output in which the excess low-frequency SQUID noise has been removed. With this technique, we have reduced the low-frequency noise by an order of magnitude in energy over measurements made without this technique.
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