An adiabatic quantum flux parametron as an ultra-low-power logic device

Abstract

Ultra-low-power adiabatic quantum flux parametron (QFP) logic is investigated since it has the potential to reduce the bit energy per operation to the order of the thermal energy. In this approach, nonhysteretic QFPs are operated slowly to prevent nonadiabatic energy dissipation occurring during switching events. The designed adiabatic QFP gate is estimated to have a dynamic energy dissipation of 12% of I c 0 for a rise/fall time of 1000 ps. It can be further reduced by reducing circuit inductances. Three stages of adiabatic QFP NOT gates were fabricated using a Nb Josephson integrated circuit process and their correct operation was confirmed.

Recent Progress on Reversible Quantum-Flux-Parametron for Superconductor Reversible Computing

“…In a previous study [10], we proposed a superconductor reversible logic gate using adiabatic quantum-fluxparametron (AQFP) [11], which is an adiabatic superconManuscript received September 28, 2017. Manuscript revised January 9, 2018.…”

A random-access-memory cell based on quantum flux parametron with three control lines

“…Several stages of AQFP buffers are connected to the RAM cell and the logic state of the last AQFP buffer is readout by using a dc-SQUID, which were magnetically coupled to the last buffer [7]. The result verifies that the write "1" and read "1" operation, and the write "0" and read "0" operation are successfully performed.…”

“…Energy-efficient superconducting circuits based on rapid single flux quantum (RSFQ) circuits [1] have been proposed recently, which include eSFQ [2], ERSFQ [3], RQL [4], and LV-RSFQ [5]. We have been developing adiabatic quantum flux parametron (AQFP) circuits based on QFP circuits [6], which are extremely energy efficient superconducting circuits [7][8][9][10]. The AQFP circuit is a promising superconducting circuit for realizing ultra-low-power computing systems because the operating frequency can be 5 to 10 GHz and the bit-energy is about six orders of magnitudes lower than that of CMOS.…”

Phase Shift and Control in Superconducting Hybrid Structures

“…Recently, various types of superconducting logic devices have been developed as candidates for post-CMOS computers, such as RSFQ [4], [30], adiabatic quantum flux parametron (AQFP) [31], [32], and reciprocal quantum logic (RQL) [33] devices. The main advantages of these superconducting logic devices are their high-speed operation and ultralow power consumption.…”