This paper proposes a SPICE model development methodology for quantum-dot cellular automata (QCA) cells and presents a SPICE model for QCA cells. The model is validated by simulating the basic logic gates such as inverter and majority voter. The proposed model makes it possible to design and simulate QCA combinational circuits and hybrid circuits of QCA and other NANO devices using SPICE. In th...

We give a one-dimensional quantum cellular automata (QCA) capable of simulating all others. By this we mean that the initial configuration and the local transition rule of any one-dimensional QCA can be encoded within the initial configuration of the universal QCA. Several steps of the universal QCA will then correspond to one step of the simulated QCA. The simulation preserves the topology in ...

Among emerging technologies, Quantum-dot Cellular Automata (QCA) is an attractive alternative for transistor based technologies. In this paper, novel efficient Quantum-dot Cellular Automata (QCA) devices are proposed that provide 3-input and 4-input AND & OR gates. These gates have simple structure and are efficient in term of cell counts, complexity and latency. These components are suitable f...

We investigate the possibility to have electron-pairs in decoherence-free subspace (DFS), by means of the quantum-dot cellular automata (QCA) and single-spin rotations, to carry out a high-fidelity and deterministic universal quantum computation. We show that our QCA device with electrons tunneling in two dimensions is very suitable for DFS encoding, and argue that our design favors a scalable ...

Quantum-dot Cellular Automata (QCA) is one of the most substitute emerging nanotechnologies for electronic circuits, because of lower power consumption, higher speed and smaller size in comparison with CMOS technology. The basic devices, a Quantum-dot cell can be used to implement logic gates and wires. As it is the fundamental building block on nanotechnology circuits. By applying XOR gate the...

In order to design large digital circuits using Quantum-Dot Cellular Automata(QCA) cells, CAD tools and automated design methodology for QCA circuits are essential. This paper presents a QCA circuits design methodology based on traditional CMOS circuits design flow. This QCA circuits design methodology utilizes the current CMOS circuits design tools such as HSPICE and Synopsys Design Compiler. ...

CMOS miniaturization limits have improved research on other advanced alternative technologies. Quantum Cellular Automata (QCA) is a nanometer scale technology that is one of these alternatives. Two principals have been introducedin the concept of Random Number Generator which are related to some physical occurrences or computational algorithms. In this paper we introduce a QCA circuit which is ...

Cellular automata are interacting classical bits that display diverse emergent behaviors, from fractals to random-number generators Turing-complete computation. We discover quantum cellular (QCA) can exhibit complexity in the sense of science describes biology, sociology, and economics. QCA when evolving under 'Goldilocks rules' we define by balancing activity stasis. Our Goldilocks rules gener...

Quantum-dot cellular automata (QCA) is an emerging technology which has been claimed to be faster and smaller than the most traditional CMOS technology. Since its beginning, many advances have been made, as the introduction of basic devices and the insertion of more complex circuits, like adders. It is not straightforward to implement more complex adders using QCA. This paper proposes the logic...