2003 Volume 72 Issue 9 Pages 1180-1182
Single Flux Quantum ( SFQ ) refers to quantized magnetic flux forming in a superconductor. SFQ logic circuits use the SFQ as an information bit. The operating principle of SFQ circuits is different from that of semiconductor circuits. This means that there are some opportunities to overcome the semiconductor performance. The basic structure of the SFQ circuits is a superconductor loop containing two Josephson junctions. The state of capturing an SFQ in the loop corresponds to the logic state "1", and that of no SFQ corresponds to "0". Utilizing this structure, various SF logic circuits such as a flip-flop circuit are constructed.
