Northrop Grumman Systems Corporation

Timothy Chi-Chao Lee

Quentin P Herr

Anna Y Herr

Alexander Louis Braun

Randall M Burnett

Harold Clifton Hearne, Iii

Ryan Edward Clarke

Harold Clifton Hearne

Non-destructive read out (NDRO) circuits are provided for use in reciprocal quantum logic (RQL) superconducting systems. Each NDRO circuit includes a 'body' circuit that provides a single or multi-state sub-critical bias current to one or many independent 'tail' circuitries. Each &#x201c;tail&#x201d; has minimal effect on the &#x201c;body&#x201d; thereby preventing any interference or destruction to the state of the &#x201c;body&#x201d; circuitry. The circuits reduce device count and thereby increase circuit density, simplify and reduce the cost of fabrication, and provide functionality not available in existing designs, such as the ability to write a state and read it in the same operation cycle. The NDRO circuits provide more compact unit cells useful in memory or logic arrays, demanding fewer resources with increased functionality. The circuits also provide compact cells for AND, AND-OR, A-NOT-B, inverter, multiplexer, and demultiplexer gates.

Superconducting non-destructive readout circuits

Growing community of inventors

Gaithersburg, MD, United States of America

Timothy Chi-Chao Lee