Three junction squid mixer

摘要

A three junction SQUID (superconducting quantum interference device) mixer circuit is disclosed wherein a nonlinear element such as a Josephson junction is coupled with a dc SQUID formed by two other nonlinear elements such as Josephson junctions and two input coils to provide a mixer circuit that can be employed for mixing two input magnetic flux signals. The mixer can be used for up-converting very low frequency signals, for minimizing and solving problems associated with quantum noise limitations, or for down-converting high frequency signals.