Mixed-valence realizations of quantum dot cellular automata

Macrae, Roderick M.

doi:10.1016/j.jpcs.2023.111303

Cited by 13 publications

(5 citation statements)

References 147 publications

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“…A comparative analysis of various memory designs is detailed in Table 10. The results show that the proposed design performs similarly to the circuit in reference (Macrae, 2022) in terms of area and cost, but it is superior in terms of the number of cells. Reference (Salimzadeh et al, 2020) is equivalent to the proposed work in terms of area and delay.…”

Section: H N P Gmentioning

confidence: 91%

Design and simulation of a new QCA-based low-power universal gate

Sadrarhami,

Zanjani,

Dolatshahi

et al. 2024

Front. Comput. Sci.

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Quantum-dot Cellular Automata (QCA) is recognized in electronics for its low power consumption and high-density capabilities, emerging as a potential substitute for CMOS technology. GDI (Gate Diffusion Input) technology is featured as an innovative approach for enhancing power efficiency and spatial optimization in digital circuits. This study introduces an advanced four-input Improved Gate Diffusion Input (IGDI) design specifically for QCA technology as a universal gate. A key feature of the proposed 10-cell block is the absence of cross-wiring, which significantly enhances the circuit’s operational efficiency. Its universal cell nature allows for the carrying out of various logical gates by merely altering input values, without necessitating any structural redesign. The proposed design showcases notable advancements over prior models, including a reduced cell count by 17%, a 29% decrease in total energy usage, and a 44% reduction in average energy loss. This innovative IGDI design efficiently executes 21 combinational and various sequential functions. Simulations in 18 nm technology, accompanied by energy consumption analyses, demonstrate this design’s superior performance compared to existing models in key areas such as multiplexers, comparators, and memory circuits, alongside a significant reduction in cell count.

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Section: H N P Gmentioning

confidence: 91%

Design and simulation of a new QCA-based low-power universal gate

Sadrarhami,

Zanjani,

Dolatshahi

et al. 2024

Front. Comput. Sci.

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“…Still, the quantum industry is growing in innovation. Quantum scientists are trying to build super-small and efficient computer systems using the quantum-dot cellular automata approach (Macrae, 2023). In addition, there is ongoing research to improve the computational power of computers.…”

Section: Innovation In Computing Efficiencymentioning

confidence: 99%

Cyber Protection Applications of Quantum Computing: A Review

Ahmed,

Sipola,

Hautamäki

2024

eccws

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Quantum computing is a cutting-edge field of information technology that harnesses the principles of quantum mechanics to perform computations. It has major implications for the cyber security industry. Existing cyber protection applications are working well, but there are still challenges and vulnerabilities in computer networks. Sometimes data and privacy are also compromised. These complications lead to research questions asking what kind of cyber protection applications of quantum computing are there and what potential methods or techniques can be used for cyber protection? These questions will reveal how much power quantum computing has and to what extent it can outperform the conventional computing systems. This scoping review was conducted by considering 815 papers. It showed the possibilities that can be achieved if quantum technologies are implemented in cyber environments. This scoping review discusses various domains such as algorithms and applications, bioinformatics, cloud and edge computing, the organization of complex systems, application areas focused on security and threats, and the broader quantum computing ecosystem. In each of these areas, there is significant scope for quantum computing to be implemented and to revolutionize the working environment. Numerous quantum computing applications for cyber protection and a number of techniques to protect our data and privacy were identified. The results are not limited to network security but also include data security. This paper also discusses societal aspects, e.g., the applications of quantum computing in the social sciences. This scoping review discusses how to enhance the efficiency and security of quantum computing in various cyber security domains. Additionally, it encourages the reader to think about what kind of techniques and methods can be deployed to secure the cyber world.

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“…It has been demonstrated that the functional properties of molecular MV cells (e.g., cell–cell response) are closely related to the ET processes and the vibronic coupling. − Recently, a number of organic and inorganic molecules have been proposed as promising candidates to act as molecular QCA cells. − Further development of the field led to the progress in the understanding of the fundamental questions such as the power dissipation during a switching event due to interaction of the cell with the environment (thermal bath) and the effect of the applied time-varying electric field on switching, device latching, and power gain (see refs – ). Contemporary achievements in the design and theoretical investigation of molecular QCA with the emphasis of MV realization were recently reviewed by Macrae in his exhaustive article …”

Section: Introductionmentioning

confidence: 99%

“…Contemporary achievements in the design and theoretical investigation of molecular QCA with the emphasis of MV realization were recently reviewed by Macrae in his exhaustive article. 25 Upon proceeding from the important application of MV complexes for molecular implementation of QCA to a more wide context of application of MV clusters in molecular electronics and spintronics, one should say that successful manipulation with conducting, magnetic, electric, and optical properties of MV compounds 26−31 efforts in this direction have been focused on a basic MV system, which includes a pair of redox centers connecting by a bridge. 32,33 The rate of ET and vibronic coupling play a crucial role in the functional properties of more complex molecular QCA cells (such as cell−cell response) and their suitability for the applications.…”

Section: Introductionmentioning

confidence: 99%

Polaronic Mechanism of Vibronic Localization in Mixed-Valence Cation Radicals with a Non-Conjugated Chromophore on the Bridge

2023

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In quest of a controllable intramolecular electron transfer (ET) across a bridge, we study the cation-radical form of the parent 1,4-diallyl-butane (I) and its derivatives (II)−(VI). In these mixed-valence (MV) compounds, the bridge of variable length connecting allyl redox sites can be either saturated (−CH2 CH2−) (I, III, and V) or unsaturated, modified by the π-spacer (−HCCH−) (II, IV, and VI). Ab initio calculations for the charge delocalized transition structure and for fully optimized localized form of 1,ω-diallyl cation radicals I–VI allowed us to estimate the potential barriers for ET between the terminal allyl groups, vibronic coupling, and ET parameters. The ET barrier in all compounds with the π-fragment on the bridge is shown to be higher with respect to that in the systems with a saturated bridge. We propose a model based on the concept of a specific polaronic effect of the spacer. Charge localization at an allyl group creates an electric field polarizing the π-fragment and the bridge as a whole. The induced dipole moment interacts with the localized charge giving rise to the additional vibronic stabilization in a self-consistent manner without an appreciable change of localized charge. Utilization of this spacer-driven polaronic effect is expected to provide a route to a controllable ET in bridged MV compounds.

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Mixed-valence realizations of quantum dot cellular automata

Cited by 13 publications

References 147 publications

Design and simulation of a new QCA-based low-power universal gate

Design and simulation of a new QCA-based low-power universal gate

Cyber Protection Applications of Quantum Computing: A Review

Polaronic Mechanism of Vibronic Localization in Mixed-Valence Cation Radicals with a Non-Conjugated Chromophore on the Bridge

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