Quantum cellular automata based on mixed-valence molecules: Some theoretical hints for cell design
https://doi.org/10.26907/mrsej-24216
Abstract
The purpose of this short review article is to discuss at a simple qualitative level some key requirements the mixed-valence (MV) molecules should meet to be potentially applicable as cells of quantum cellular automata (QCA), and also how different interactions affect their fulfillment. We focus on two requirements, which are closely related to encoding and propagating of binary information within the electronic circuits and power dissipation caused by the logical operations. The physical features behind these requirements are the following: the ability of MV molecules to be efficiently switched between two logical binary states which assumes high polarizability manifesting itself in a strong non-linear cell-cell response and a low heat release caused by molecular rearrangements accompanying logical operations. We discuss the role of such electronic interactions as intramolecular electron transfer, intramolecular interelectronic Coulomb repulsion and the interaction of the excess electrons of a molecular cell with the electric field produced by the neighboring polarized cell. The pivotal role of the interaction of the excess electrons with the molecular vibrations (pseudo Jahn-Teller vibronic coupling) is discussed as well. Finally, the optimal conditions expressed as a parametric regime ensuring simultaneous fulfillment of the aforenamed requirements are discussed.
Keywords
quantum cellular automata,
cell-cell response,
mixed-valency,
electron transfer,
molecular bistability,
Coulomb interaction,
pseudo Jahn-Teller effect,
power dissipation
Supporting agencies: The work was in part (evaluation of heat release in course of nonadiabatic switching) performed with financial support from the Russian Science Foundation (V. B., A. P., project no. 2013-00374-ˇ) and in part (evaluation and analysis of cell-cell response functions) with financial support from the Ministry of Science and Higher Education of the RF (V. B., A. P., state assignment No. 124013100858-3).
About the Authors
B. Tsukerblat
Ben-Gurion University of the Negev
Israel
Israel
84105 Beer-Sheva
V. Belonovich
Federal Research Center of Problems of Chemical Physics and Medicine Chemistry; Moscow Institute of Physics and Technology
Russian Federation
Russian Federation
Chernogolovka 142432
Dolgoprudny 141701
A. Palii
Federal Research Center of Problems of Chemical Physics and Medicine Chemistry
Russian Federation
Russian Federation
Chernogolovka 142432
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Review
For citations:
Tsukerblat B., Belonovich V., Palii A. Quantum cellular automata based on mixed-valence molecules: Some theoretical hints for cell design. Magnetic Resonance in Solids. 2024;26(2):24216 (14 pp.). https://doi.org/10.26907/mrsej-24216
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