FIG. 9 shows a circuit diagram implementing the dual-read RQL D-register 800 of FIG. 8 as an example RQL-compatible superconducting circuit 900. Body stage 902 of circuit 900 includes two input ports DI and LCLK, three Josephson junctions J2, J3, and J4, two input inductors L1 and L2, and transformer(s) for inductively coupling a DC flux bias from a DC flux bias line. Body stage 902 can correspond to body 110 in FIG. 1. First and second tail stages 904, 906 of circuit 900 include respective input ports NDRO_A, NDRO_B, respective output ports QO_A, QO_B, respective inductors L3_A, L3_B, and respective Josephson junctions J5_A, J5_B. Tail stages 904, 906 can correspond to tails 112 in FIG. 1. Body stage 902 can be connected to tail stages 904, 906 by a linking inductors LL_A, LL_B.

The functioning of the body stage 902 and tail stages 904, 906 in circuit 900 of FIG. 9 is substantially the same as the functioning of body stage 702 and tail stage 704 in circuit 700 of FIG. 7, except that, since in the particular example of circuit 900 both tail stages 904, 906 are connected to the same “output” of body stage 902 and thus receive the same stored state from body stage 902, the output current from body stage 902 is required to be large enough to drive two tails instead of one. Consequently, the sizes of the Josephson junction devices in body stage 902 may be larger as compared to those in body stage 702 of circuit 700.