Patent US10320394

Superconducting circuits for an A-and-not-B gate having an exclusive-OR gate and an AND gate
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US10320394

1. A circuit for an A-and-not-B gate comprising: (2) (5)

an output terminal;

a first input terminal for receiving a first set of single flux quantum (SFQ) pulses;

a second input terminal for receiving a second set of SFQ pulses;

a first stage configured to perform an exclusive-OR operation on the first set of SFQ pulses received via the first input terminal and the second set of SFQ pulses received via the second input terminal to generate an exclusive-OR result; and

a second stage, coupled to the first stage, configured to perform an AND operation on the exclusive-OR result and the first set of SFQ pulses received via the first input terminal and provide an output via the output terminal.

2. The circuit of claim 1, wherein the first stage comprises an escape junction. (1) (0)

4. The circuit of claim 1, wherein the first stage comprises a first inductor coupled between the first input terminal and a first node, a first Josephson junction coupled between the first node and a ground terminal, and a second inductor coupled between the first node and a second node. (1) (0)

8. A method of operating a circuit for an A-and-not-B gate, wherein the circuit including an output terminal, the method comprising: (1) (4)

receiving a first set of single flux quantum (SFQ) pulses via a first input terminal;

receiving a second set of SFQ pulses via a second input terminal;

performing an exclusive-OR operation on the first set of SFQ pulses received via the first input terminal and the second set of SFQ pulses received via the second input terminal to generate an exclusive-OR result; and

performing an AND operation on the exclusive-OR result and the first set of SFQ pulses received via the first input terminal such that the circuit is configured to pass the first set of SFQ pulses to the output terminal only when inputs to the exclusive-OR operation differ and inputs to the AND operation are the same.

9. The method of claim 8, wherein the exclusive-OR operation is performed using a first stage and the AND operation is performed using a second stage coupled to the first stage. (2) (0)

10. The method of claim 9, wherein the first stage comprises an escape junction. (1) (0)

12. The method of claim 9, wherein the first stage comprises a first inductor coupled between the first input terminal and a first node, a first Josephson junction coupled between the first node and a ground terminal, and a second inductor coupled between the first node and a second node. (1) (0)

16. A circuit for an A-and-not-B gate comprising: (2) (7)

an output terminal;

a first input terminal for receiving a first set of single flux quantum (SFQ) pulses;

a powered junction coupled to the first input terminal;

a second input terminal for receiving a second set of SFQ pulses;

a second stage, coupled to the first stage, configured to perform an AND operation on the exclusive-OR result and the first set of SFQ pulses received via the first input terminal such that the circuit is configured to pass the first set of SFQ pulses to the output terminal only when inputs to the exclusive-OR operation differ and inputs to the AND operation are the same; and

a powered junction coupled to the output terminal.

17. The circuit of claim 16, wherein the first stage comprises an escape junction. (1) (0)

19. The circuit of claim 16, wherein the first stage comprises a first inductor coupled between the first input terminal and a first node, a first Josephson junction coupled between the first node and a ground terminal, and a second inductor coupled between the first node and a second node. (1) (0)

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Patent US10320394

Superconducting circuits for an A-and-not-B gate having an exclusive-OR gate and an AND gate

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