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ST461 - Demonstration of 10k-gate-scale Adiabatic-Quantum-Flux-Parametron Circuits

Demonstration of 10k-gate-scale Adiabatic-Quantum-Flux-Parametron Circuits
 
Tatsuya Narama1, Yuki Yamanashi1, Nobuyuki Yoshikawa1, Naoki Takeuchi2, Thomas Ortlepp3
 
1Department of Electrical and Computer Engineering, Yokohama National University, Yokohama, Japan
2Institute of Advanced Sciences, Yokohama National University, Yokohama, Japan
The CiS Research Institute for Microsensor Systems and Photovoltaics. Erfurt, Germany
 
 
Abstract — Adiabatic quantum flux parametron (AQFP) is a very energy-efficient superconductor logic. In AQFP logic, dynamic energy dissipation can be drastically reduced due to adiabatic switching operations using ac excitation currents. In the present study, we evaluated circuit yields using a large-scale AQFP circuit composed of as many as 10,000 AQFP gates with approximately 20,000 Josephson junctions. We measured eleven chips from four wafers and obtained circuit yields of 48% for 1,000-gate circuits and 22% for 10,000-gate circuits, respectively.  In all the circuits, which worked correctly, the margins of excitation currents were as wide as approximately ±20%.

Keywords (Index Terms) — Adiabatic Quantum Flux Parametron, AQFP, flux biasing, adiabatic operation, circuit yield.

IEEE/CSC & ESAS SUPERCONDUCTIVITY NEWS FORUM (global edition), July 2015.
Selected August 6, 2015. Reference ST461; Category 4. 
Preprint of invited poster paper DS-P04-INV presented at ISEC 2015; Nagoya, Japan, July 6 – 9, 2015. 
Final version will be published by IEEE XPLORE.