If the single-electron conductances Rmin and capacitances C 1.2 of the junctions are small enough (Eq 1), the dynamics is influenced drastically by e-quantization of the electrical charge Q of the central electrode. 2) comprising twin pairs of small tunnel junctions is analyzed. We will show that the proposed method is very efficient and fast in deriving the simplified majority expressions in QCA design.ĭynamics of two simple structures (Fig. The adder is designed and simulated using QCADesigner, a design and simulation tool for QCA. As an example, a 1-bit QCA adder is constructed with only three majority gates and two inverters. By applying this method, the hardware requirements for a QCA design can be reduced. We describe a novel method for using these standard functions to convert the sum-of-products expression to majority logic. Thirteen standard functions are introduced to represent all three-variable Boolean functions and the simplified majority expressions corresponding to these standard functions are presented. In this paper, a method for reducing the number of majority gates required for computing three-variable Boolean functions is developed to facilitate the conversion of sum-of-products expression into QCA majority logic. The basic Boolean primitive in quantum cellular automata (QCA) is the majority gate. Interaction of the system with its environment, as well as the system's Which entanglement poses a problem for memory and clocking depends upon the Implementations of QCA, entanglement will play a greater role. In the limit of very low tunneling rates, which can be realized in Previous simulations which employed the ICHA. Additionally, energy relaxation tends to bring groups Groups of active cells experience oscillations in their polarization states as The model, we find that intercellular entanglement changes the qualitativeīehaviour of the system, and new features appear. Quantum mechanical Ising-like spin chain in a transverse field, including theĮffects of intercellular entanglement. Results that treat small groups of QCA cells with a Hamiltonian analogous to a Possibility of entanglement between cells. So-called Intercellular Hartree Approximation (ICHA), which neglects the Quantum-dot Cellular Automata (QCA) provides a basis for classicalĬomputation without transistors.
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