Superconductive latch circuit

A superconductive latch circuit for storing data therein, comprising in combination:

• a superconductive storage loop for storing data therein as an electrical current, said loop being comprised of a non-latching first switch and an inductance, said switch being capable of having at least first and second voltage states, wherein said electrical current is maintained in said storage loop when said switch is in its first state and diminishes when said switch is in its second state,
• first control means for putting said non-latching switch into its second state,
• supply means for controllably supplying AC current to said storage loop, said supply means including an AC power source in series with a latching second switch which has at least first and second voltage states, said latching switch diverting said AC current to said storage loop when it is in its second voltage state,
• second control means for applying said data to said latching switch to put said latching switch into its second voltage state,
• wherein data stored in said loop is not lost when said AC current diminishes to zero or changes polarity.

A superconductive latch circuit for storing data therein, comprising in combination:

• a superconductive storage loop including a first switch capable of at least two voltage states and an inductance, said storage loop being capable of holding a circulating current therein when said first switch is in a first voltage state, wherein said first switch cannot sustain a voltage thereacross due to said inductance,
• a damping resistor connected in parallel with said first switch,
• first control means for putting said first switch into a second voltage state, said switch being incapable of retaining its second voltage state,
• a supply means for supplying current to said storage loop for storage therein representing said data, said supply means including an input switch, a current means for supplying said current to said input switch having at least one input thereto for controlling the state of said input switch, a first electrical path connected to said input switch for diverting said current away from said storage loop and a second electrical path connected to said switch for sending said current to said storage loop when said input switch is in a second state.

A superconductive SET/RESET latch for storing data therein, comprising in combination:

• a superconductive storage loop including an inductance and a single superconductive switch capable of having at least a first and second state, said superconductive loop being able to retain an electrical current therein when said switch is in its first state,
• a sense circuit responsive to the presence and absence of said electrical current in said storage loop, an output of said sense circuit being fed back to be a control signal to said switch, the presence of a control signal placing said switch in said second state,
• an AND gate having at least two inputs thereto, one of which is the output fed back from said sense circuit,
• a source of current which is delivered to said storage loop when said at least two inputs are simultaneously present to said AND circuit, and
• a reset control signal for switching said storage loop switch to its second state.