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Patent US10374610
Issued 2019-08-06
Reciprocal Quantum Logic Based Circuits For An A-and-not-b Gate
Superconducting circuits-based devices and methods, including reciprocal quantum logic (RQL) based devices and methods are provided. In one example, a circuit for an A-and-not-B gate including an output terminal, a first input terminal for receiving a first set of single flux quantum (SFQ) pulses, and a second input terminal for receiving a second set of SFQ pulses is provided. The circuit further includes a first Josephson junction (JJ) coupled to receive the first set of SFQ pulses. The circuit further includes a second JJ, where the second JJ when positively biased is configured to negatively bias the first JJ such that the circuit is configured to not pass the first set of SFQ pulses to the output terminal only when the second set of SFQ pulses have arrived at the second input terminal prior to an arrival of the first set of SFQ pulses at the first input terminal.
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- 1. A circuit for an A-and-not-B gate comprising:
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 Josephson junction (JJ) coupled to receive the first set of SFQ pulses; and a second JJ coupled to the first JJ, wherein the second JJ is configured to negatively bias the first JJ such that the circuit is configured to not pass the first set of SFQ pulses to the output terminal only when the second set of SFQ pulses have arrived at the second input terminal prior to an arrival of the first set of SFQ pulses at the first input terminal.
- 8. A circuit for an A-and-not-B gate comprising:
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 Josephson junction (JJ) coupled to receive the first set of SFQ pulses, wherein the first JJ having a first end coupled to a first node and having a second end coupled to a ground terminal; and a second JJ having a first end directly coupled to the output terminal, wherein the second JJ is configured to negatively bias the first JJ such that the circuit is configured to not pass the first set of SFQ pulses to the output terminal only when the second set of SFQ pulses have arrived at the second input terminal prior to an arrival of the first set of SFQ pulses at the first input terminal.
- 15. A method of operating a circuit for an A-and-not-B gate, wherein the circuit including an output terminal, the method comprising:
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; and passing the first set of SFQ pulses to the output terminal in response to a triggering of a first Josephson junction (JJ), coupled to the output terminal, unless negative biasing of the first JJ because of triggering of a second JJ coupled to the first JJ prevents the first JJ from triggering, wherein the triggering of the second JJ is caused at least by an arrival of the second set of SFQ pulses at the second input terminal prior to an arrival of the first set of SFQ pulses at the first input terminal.
