Reversibility and energy dissipation in adiabatic superconductor logic

Abstract Reversible computing is considered to be a key technology to achieve an extremely high energy efficiency in future computers. In this study, we investigated the relationship between reversibility and energy dissipation in adiabatic superconductor logic. We analyzed the evolution of phase di...

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Autores principales:	Naoki Takeuchi, Yuki Yamanashi, Nobuyuki Yoshikawa
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/35a3eb152cd640e3a0da43c9e26aaf82
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spelling	oai:doaj.org-article:35a3eb152cd640e3a0da43c9e26aaf822021-12-02T16:06:35ZReversibility and energy dissipation in adiabatic superconductor logic10.1038/s41598-017-00089-92045-2322https://doaj.org/article/35a3eb152cd640e3a0da43c9e26aaf822017-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00089-9https://doaj.org/toc/2045-2322Abstract Reversible computing is considered to be a key technology to achieve an extremely high energy efficiency in future computers. In this study, we investigated the relationship between reversibility and energy dissipation in adiabatic superconductor logic. We analyzed the evolution of phase differences of Josephson junctions in the reversible quantum-flux-parametron (RQFP) gate and confirmed that the phase differences can change time reversibly, which indicates that the RQFP gate is physically, as well as logically, reversible. We calculated energy dissipation required for the RQFP gate to perform a logic operation and numerically demonstrated that the energy dissipation can fall below the thermal limit, or the Landauer bound, by lowering operation frequencies. We also investigated the 1-bit-erasure gate as a logically irreversible gate and the quasi-RQFP gate as a physically irreversible gate. We calculated the energy dissipation of these irreversible gates and showed that the energy dissipation of these gate is dominated by non-adiabatic state changes, which are induced by unwanted interactions between gates due to logical or physical irreversibility. Our results show that, in reversible computing using adiabatic superconductor logic, logical and physical reversibility are required to achieve energy dissipation smaller than the Landauer bound without non-adiabatic processes caused by gate interactions.Naoki TakeuchiYuki YamanashiNobuyuki YoshikawaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Naoki Takeuchi Yuki Yamanashi Nobuyuki Yoshikawa Reversibility and energy dissipation in adiabatic superconductor logic
description	Abstract Reversible computing is considered to be a key technology to achieve an extremely high energy efficiency in future computers. In this study, we investigated the relationship between reversibility and energy dissipation in adiabatic superconductor logic. We analyzed the evolution of phase differences of Josephson junctions in the reversible quantum-flux-parametron (RQFP) gate and confirmed that the phase differences can change time reversibly, which indicates that the RQFP gate is physically, as well as logically, reversible. We calculated energy dissipation required for the RQFP gate to perform a logic operation and numerically demonstrated that the energy dissipation can fall below the thermal limit, or the Landauer bound, by lowering operation frequencies. We also investigated the 1-bit-erasure gate as a logically irreversible gate and the quasi-RQFP gate as a physically irreversible gate. We calculated the energy dissipation of these irreversible gates and showed that the energy dissipation of these gate is dominated by non-adiabatic state changes, which are induced by unwanted interactions between gates due to logical or physical irreversibility. Our results show that, in reversible computing using adiabatic superconductor logic, logical and physical reversibility are required to achieve energy dissipation smaller than the Landauer bound without non-adiabatic processes caused by gate interactions.
format	article
author	Naoki Takeuchi Yuki Yamanashi Nobuyuki Yoshikawa
author_facet	Naoki Takeuchi Yuki Yamanashi Nobuyuki Yoshikawa
author_sort	Naoki Takeuchi
title	Reversibility and energy dissipation in adiabatic superconductor logic
title_short	Reversibility and energy dissipation in adiabatic superconductor logic
title_full	Reversibility and energy dissipation in adiabatic superconductor logic
title_fullStr	Reversibility and energy dissipation in adiabatic superconductor logic
title_full_unstemmed	Reversibility and energy dissipation in adiabatic superconductor logic
title_sort	reversibility and energy dissipation in adiabatic superconductor logic
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/35a3eb152cd640e3a0da43c9e26aaf82
work_keys_str_mv	AT naokitakeuchi reversibilityandenergydissipationinadiabaticsuperconductorlogic AT yukiyamanashi reversibilityandenergydissipationinadiabaticsuperconductorlogic AT nobuyukiyoshikawa reversibilityandenergydissipationinadiabaticsuperconductorlogic
_version_	1718384953986646016

Reversibility and energy dissipation in adiabatic superconductor logic

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