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IEICE Technical Report; IEICE Tech. Rep.

Demonstration of Quantum Flux Parametron without DC Offset Currents using Ferromagnets

Hayato Iwashita, Hiroshi Itô, Taniguchi Soya, Tanaka Masamitsu, Fujimaki Akira

Published Aug 2, 2017• 0 citations
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IEEJ Transactions on Fundamentals and Materials•Jan 1, 2016•0 citations
Adiabatic quantum-flux-parametron (AQFP) logic is a promising technology for use in future high-end computers because its bit energy can be potentially reduced to the order of thermal energy. AQFP gates are driven by an AC bias current, which changes their potential energy adiabatically. In the present paper, we propose an on-chip AC power source, which is composed of a Josephson relaxation oscillator and a superconducting resonator, to drive the AQFP gates. We designed and implemented the AC power source using a Nb Josephson integrated circuit process. We confirmed that the AC power source can generate a 4.4 GHz sinusoidal current from a DC bias current and that the output amplitude of the AC power source can be controlled by varying the DC bias current.
Functional switching has been demonstrated based on quantum flux parametron (QFP) circuits with ferromagnetic patterns toward reconfigurable circuits. We form small ferromagnetic patterns of a PdNi alloy on a superconducting loop without degradation of superconductivity. Direction and strength of magnetization of ferromagnetic patterns are controlled by direction and magnitude of an applied magnetic field in a cooling process around the Currie points of the alloy. The ferromagnetic patterns induce a circulating current serving as one of the input currents in a three-inputs QFP majority gate. We obtained functional switching between the AND to the OR operation depending on the direction and strength of magnetization of the ferromagnetic patterns experimentally. The obtained operation margin agreed with a numerically obtained margin, though the magnitude of magnetization at the switching between two operation modes was different. This technique add new functionality and flexibility to the QFP-based integrated circuits.