| US 9,812,836 B1 | ||
| Reversible computation with flux solitons | ||
| Kevin D. Osborn, Laurel, MD (US) | ||
| Assigned to The United States of America as represented by the Director, National Security Agency, Washington, DC (US) | ||
| Filed by The United States of America as represented by the Director, National Security Agency, Washington, DC (US) | ||
| Filed on Nov. 12, 2014, as Appl. No. 14/121,007. | ||
| Int. Cl. H01S 3/00 (2006.01); H01S 3/02 (2006.01) | ||
| CPC H01S 3/02 (2013.01) | 20 Claims |
| 1. A reversible superconducting circuit comprising:
a plurality of Josephson transmission lines, wherein:
each Josephson transmission line includes:
a discretized Long Josephson Junction, including:
a parallel array of Josephson Junctions; and
a plurality of superconducting inductors, wherein
the inductors connect the Josephson Junctions in the array;
each Josephson transmission line is configured to pass a fluxon along the length of the array of Josephson Junctions, the
fluxon being a soliton having total flux equal to Φ0, where Φ0 is the magnetic flux quantum;
a first of the Josephson transmission lines is configured to transmit a first target fluxon from the first of the Josephson
transmission lines to one of a first output and a second output only when a first target input is active;
a second of the Josephson transmission lines is configured to transmit a second target fluxon from the second of the Josephson
transmission lines to one of the first output and the second output only when a second target input is active;
a third of the Josephson transmission lines is configured to transmit a control fluxon only when a control input is active,
wherein:
the reversible superconducting circuit is configured to, when at least two fluxons are transmitted, transmit the fluxons substantially
synchronously; and
a path of the first target fluxon and a path of the second target fluxon are determined at least in part by a presence or
an absence of the control fluxon;
the superconducting circuit is configured to, if the control input is active:
transmit the first target fluxon to the first output only if the first target input is active; and
transmit the second target fluxon to the second output only if the second target input is active; and
the superconducting circuit is configured to, if the control input is not active:
transmit the first target fluxon to the second output only if the first target input is active; and
transmit the second target fluxon to the first output only if the second target input is active.
|