Operation of Quantum Cellular Automaton cells with more than two electrons

TL;DR

This paper demonstrates the feasibility of operating quantum cellular automaton cells with more than two electrons, specifically with four electrons per cell, and introduces a revised polarization formula validated through quantum simulations.

Contribution

It introduces a new operational regime for QCA cells with four electrons and a revised polarization model based on diagonal occupancy differences.

Findings

QCA cells with four electrons can operate with 4N+2 electrons per cell.

A revised polarization formula accurately describes cell interactions.

Quantum simulations confirm the viability of this operation mode.

Abstract

We present evidence that operation of QCA (Quantum Cellular Automaton) cells with four dots is possible with an occupancy of 4N+2 electrons per cell (N being an integer). We show that interaction between cells can be described in terms of a revised formula for cell polarization, which is based only on the difference between diagonal occupancies. We validate our conjectures with full quantum simulations of QCA cells for a number of electrons varying from 2 to 6, using the Configuration-Interaction method.