Binary adder using josephson devices

Claim 1

A binary adder comprising, a. a first Josephson device for switching from the v 0 to the v 2 Delta state when a gating current applied thereto exceeds a critical gating current, b. means for applying a first gating current Ig1 to said first Josephson device, c. a second Josephson device for switching from the v 0 to the v 2 Delta state when a gating current applied thereto exceeds a critical gating current, d. means for applying a second gating current Ig2 to said second Josephson device, e. first and second control current means overlaying said first and second Josephson devices for carrying control currents along the same axis as said gating currents for varying the magnetic field of said Josephson devices, wherein the presence and absence of a control current Ix in any said control current means corresponds respectively to first and second binary values, f. said first Josephson device having a gain curve of critical current versus control current which exceeds Ig1 for total control currents of zero and 2Ix and which is below Ig1 for total control currents of Ix and 3Ix, and g. said second Josephson device having a gain curve of critical current versus control current which exceeds Ig2 for total control currents of zero and Ix and which is below Ig2 for total control currents of 2Ix and 3Ix.