Partially Reversible Pipelined QCA Circuits: Combining Low Power With High Throughput

Ottavi, Marco; Pontarelli, Salvatore; DeBenedictis, Erik P.; Salsano, A.; Frost-Murphy, Sarah E.; Kogge, Peter M.; Lombardi, Fabrizio

doi:10.1109/tnano.2011.2147796

Cited by 38 publications

(9 citation statements)

References 19 publications

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“…• Basic QCA building blocks such as wires and primitive logic gates can indeed be operated in a physically reversible way, i. e. below Landauer's limit. • The same also holds for more complex QCA designs made up of these reversible building blocks-thereby demonstrating QCA's general capability to conduct computations with an energy dissipation below this crucial barrier (and without significant architectural changes such as used in [17], [18]).…”

Section: Introductionmentioning

confidence: 73%

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Near Zero-Energy Computation Using Quantum-dot Cellular Automata

Torres,

Niemann,

Wille

et al. 2018

Preprint

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Energy dissipation has become a crucial aspect for the further development of computing technologies. Despite the good progress that has been achieved in this regard, there is a fundamental thermodynamic limit (known as Landauer's limit) that will never be broken by conventional technologies as long as the computations are performed in the conventional, non-reversible way. But even if reversible computations were performed, the basic energy needed for operating the circuits is still far too high. In contrast, novel nanotechnologies like Quantum-dot Cellular Automata (QCA) allow for computations with very low energy dissipation and, hence, are promising candidates for breaking this limit. Accordingly, the design of reversible QCA circuits is an active field of research. But whether QCA in general (and the proposed circuits in particular) are indeed able to break Landauer's limit is unknown thus far, because neither physical realizations nor appropriate simulation approaches were available yet. In this work, we address this gap by utilizing an established theoretical model that has been implemented in a physics simulator enabling a precise consideration of how energy is dissipated in QCA designs. Our results provide strong evidence that QCA is indeed a suitable technology for breaking Landauer's limit. Further, the first physically reversible design of an adder circuit is presented which serves as proof-of-concept for future fully reversible circuit realizations.

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Section: Introductionmentioning

confidence: 73%

“…Instead, Landauer's limit can only be broken if reversibility is kept until the physical level. In this regard, specific clocking strategies as proposed in [17], [18] seem much more promising. However, due to the absence of a method for exact estimation of the energy dissipation in QCA designs, the assumptions could not be validated.…”

Section: Introductionmentioning

confidence: 99%

Near Zero-Energy Computation Using Quantum-dot Cellular Automata

Torres,

Niemann,

Wille

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…In fact, we have a binary-to-ternary converter here as well. Reversibility which refers to the fact that outputs can be constructed through inputs in a reversible circuit [24][25][26] is shown in this work. Of course, the concept of reversibility here is strongly dependent on clocking assignment.…”

Section: Experimental Results For the Convertermentioning

confidence: 99%

Coplanar wire crossing in quantum cellular automata using a ternary cell

Arjmand¹,

Soryani²,

Navi

2013

IET Circuits, Devices & Systems

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To date, ternary quantum-dot cellular automata (QCA) has been especially investigated and also is being advanced. Nonetheless, it should be possible to make interactions between binary QCA and ternary QCA circuits in order to have a versatile platform of designing. On the other hand, one of the most important concerns in QCA is minimising wire crossings because of low robustness caused by their manufacturing process and operational defects. In this study, a novel ternary-tobinary (and vice versa) converter is introduced firstly and a novel coplanar wire crossing scheme is proposed and presented afterwards. The latter scheme uses both kinds of binary and ternary QCA cells and provides a reliable crossover. Detailed circuit designs and results are presented to show correct functionality of the proposed circuits.

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“…Eventually, the logic is copied to the output (right) cell. Inverter and more complex FCN devices have been also proposed in the literature [14,15,16].…”

Section: B Molecular Fcn Devicesmentioning

confidence: 99%

Ab initio Molecular Dynamics Simulations of Field-Coupled Nanocomputing Molecules

Ardesi

Gaeta

Beretta

et al. 2021

JICS

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Molecular Field-Coupled Nanocomputing (FCN) represents one of the most promising solutions to overcome the issues introduced by CMOS scaling. It encodes the information in the molecule charge distribution and propagates it through electrostatic intermolecular interaction. The need for charge transport is overcome, hugely reducing power dissipation.At the current state-of-the-art, the analysis of molecular FCN is mostly based on quantum mechanics techniques, or ab initio evaluated transcharacteristics. In all the cases, studies mainly consider the position of charges/atoms to be fixed. In a realistic situation, the position of atoms, thus the geometry, is subjected to molecular vibrations. In this work, we analyse the impact of molecular vibrations on the charge distribution of the 1,4-diallyl butane. We employ Ab Initio Molecular Dynamics to provide qualitative and quantitative results which describe the effects of temperature and electric fields on molecule charge distribution, taking into account the effects of molecular vibrations. The molecules are studied at near-absolute zero, cryogenic and ambient temperature conditions, showing promising results which proceed towards the assessment of the molecular FCN technology as a possible candidate for future low-power digital electronics. From a modelling perspective, the diallyl butane demonstrates good robustness against molecular vibrations, further confirming the possibility to use static transcharacteristics to analyse molecular circuits.

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Partially Reversible Pipelined QCA Circuits: Combining Low Power With High Throughput

Cited by 38 publications

References 19 publications

Near Zero-Energy Computation Using Quantum-dot Cellular Automata

Near Zero-Energy Computation Using Quantum-dot Cellular Automata

Coplanar wire crossing in quantum cellular automata using a ternary cell

Ab initio Molecular Dynamics Simulations of Field-Coupled Nanocomputing Molecules

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