Non‐adiabatic energy dissipation of quantum cellular automata logic devices
Adeleh Ghasemi Farbod, Ehsan Rahimi · IET Circuits Devices & Systems · 2020
Quantum cellular automata (QCA) enables performing logic operations at the sub‐nm scale. The clock field provides energy gain in QCA circuits, and the energy is dissipated while data flow from inputs to outputs during clock time slots. The authors start from a quantum mechanical model and end in a simple electrostatic model for energy calculation of molecular QCA systems, where the cells are fully polarised, and the tunnelling energy is neglectable compared to the Kink energy. The electrostatic model does not utilise Hartree–Fock approximation and projects asymmetric energy dissipation when the order of inputs are changed. The non‐adiabatic energy dissipations of basic QCA logic devices are analysed utilising electrostatic and thermodynamic models in subsequent clock time interval transitions. Essential considerations in designing low power QCA devices emerge.