Method and apparatus for ballistic single flux quantum logic

A dual branch gate, comprising:

• a first input filter for receiving a first input pulse;
• a first Josephson junction and a second Josephson junction connected in parallel to the first input filter;
• a second input filter for receiving a second input pulse;
• a third Josephson junction and a fourth Josephson junction connected in parallel to the second input filter;
• a first output node communicating with the first input and the second input;
• a first loop transformer for causing the first input pulse to reach the first output node and for preventing the first input pulse from reaching the second Josephson junction;
• a third input filter for receiving a third input pulse;
• a fifth Josephson junction and a sixth Josephson junction connected in parallel to the third input filter;
• a second output node communicating with the second input and the third input;
• and
• a second loop transformer for causing the third input pulse to reach the second output node and for preventing the third input pulse from reaching the fifth Josephson junction
• wherein the third input pulse is an inverse of the first input pulse.