Quantum flux parametron: a single quantum flux device for Josephson supercomputer

Hosoya, M.; Hioe, W.; Casas, J.; Kamikawai, R.; Harada, Yutaka; Wada, Yasuo; Nakane, Hideaki; Suda, Reiji; Goto, Eiichi

doi:10.1109/77.84613

Cited by 135 publications

(65 citation statements)

References 33 publications

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“…ductor logic based on quantum-flux-parametron (QFP) [12]. The proposed reversible gate, which is designated as reversible QFP (RQFP), has a symmetrical structure and is bijective, which indicates the thermodynamic and logical reversibility of RQFP.…”

Section: Introductionmentioning

confidence: 99%

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

Takeuchi

Yamanashi

Yoshikawa

2018

IEICE Trans. Electron.

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SUMMARYWe have been investigating reversible quantum-fluxparametron (RQFP), which is a reversible logic gate using adiabatic quantum-flux-parametron (AQFP), toward realizing superconductor reversible computing. In this paper, we review the recent progress of RQFP. Followed by a brief explanation on AQFP, we first review the difference between irreversible logic gates and RQFP in light of time evolution and energy dissipation, based on our previous studies. Numerical calculation results reveal that the logic state of RQFP can be changed quasi-statically and adiabatically, or thermodynamically reversibly, and that the energy dissipation required for RQFP to perform a logic operation can be arbitrarily reduced. Lastly, we show recent experimental results of an RQFP cell, which was newly designed for the latest cell library. We observed the wide operation margins of more than 4.7 dB with respect to excitation currents. key words: reversible computing, adiabatic logic, QFP

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Section: Introductionmentioning

confidence: 99%

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

Takeuchi

Yamanashi

Yoshikawa

2018

IEICE Trans. Electron.

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“…is expressed as the existence of an output current flowing through the output inductor L out . This circuit structure is very similar to that of the quantum flux parametron (QFP) [2]; however, this structure does not include a clock current. The input signal is magnetically supplied via mutual inductance of K in .…”

Section: Superconductive Combinational Logic Circuitmentioning

confidence: 97%

“…Several superconductive logic circuits such as the superconductive latching logic circuit [1] and the quantum flux parametron [2] have been proposed and developed. Among them, the superconductive single-flux-quantum (SFQ) logic circuit [3], which uses flux quanta in superconductive rings containing Josephson junctions as carriers of information, can operate at a clock frequency of above 100 GHz under ultralow-power consumption conditions.…”

Section: Introductionmentioning

confidence: 99%

Superconductive combinational logic circuit using magnetically coupled SQUID array

Yamanashi

Umeda

Sai

2010

Physica C: Superconductivity and its Applications

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a b s t r a c tIn this paper, we propose the development of superconductive combinational logic circuits. One of the difficulties in designing superconductive single-flux-quantum (SFQ) digital circuits can be attributed to the fundamental nature of the SFQ circuits, in which all logic gates have latching functions and are based on sequential logic. The design of ultralow-power superconductive digital circuits can be facilitated by the development of superconductive combinational logic circuits in which the output is a function of only the present input. This is because superconductive combinational logic circuits do not require determination of the timing adjustment and clocking scheme. Moreover, semiconductor design tools can be used to design digital circuits because CMOS logic gates are based on combinational logic. The proposed superconductive combinational logic circuits comprise a magnetically coupled SQUID array. By adjusting the circuit parameters and coupling strengths between neighboring SQUIDs, fundamental combinational logic gates, including the AND, OR, and NOT gates, can be built. We have verified the accuracy of the operations of the fundamental logic gates by analog circuit simulations.

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“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Takayama

Takeuchi

Yamanashi

et al. 2018

J. Phys.: Conf. Ser.

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Quantum flux parametron: a single quantum flux device for Josephson supercomputer

Cited by 135 publications

References 33 publications

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

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

Superconductive combinational logic circuit using magnetically coupled SQUID array

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

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