by Géza Tóth In this thesis we investigate the role of correlation and coherence in two possible realizations of Quantum-dot Cellular Automata (QCA): realizations as a semiconductor multi-quantum-dot structure and as a metal-island single electron tunneling circuit. The two are different from the point of view of the underlying physics. The metal island circuits are very strongly connected to t...

Quantum-dot cellular automaton (QCA) is a novel nanotechnology with a very different computational method in compared with CMOS, whereas placement of electrons in cells indicates digital information. This nanotechnology with specifications such as fast speed, high parallel processing, small area, low power consumption and higher switching frequency becomes a promising candidate for CMOS tec...

The fundamental logical element of a quantum-dot cellular automata (QCA) circuit is majority voter gate (MV). The efficiency of a QCA circuit is depends on the efficiency of the MV. This paper presents an efficient single layer five-input majority voter gate (MV5). The structure of proposed MV5 is very simple and easy to implement in any logical circuit. This proposed MV5 reduce number of cells...

The Integrated Circuit Technology(IC) is growing day by day to improve circuit performance. Quantum dot cellular automata (QCA) is one of the noval technology in nano electronics, introduced to overcome the scaling limitations takes place in CMOS Technology. This technology is suitable for development of ultra-dense low-power high-performance digital circuits. In this paper we are implementing ...

This paper introduces a peculiar approach of designing Static Random Access Memory (SRAM) memory cell in Quantum-dot Cellular Automata (QCA) technique. The proposed design consists of one 3-input MG, one 5-input MG in addition to a (2×1) Multiplexer block utilizing the loop-based approach. The simulation results reveals the excellence of the proposed design. The proposed SRAM cell achieves 16% ...

We present a compositional algebraic framework to describe the evolution of quantum fields in discretised spacetimes. show how familiar notions from Relativity and causality can be recovered purely order-theoretic way causal order events spacetime, with no direct mention analysis or topology. formulate theory-independent over orders compositional, functorial way. draw strong connection Algebrai...

Low power dissipation, high packaging density and operation at Tera-hertz frequencies are highly desired features in the design and fabrication of logic circuits. Promising realization of these highly desired features have made Quantum dot Cellular Automata (QCA) a prospective replacement to the conventional CMOS technology for the fabrication of logic circuits in nano scale range. The traditio...

As an emerging nanotechnology, quantum-dot cellular automata (QCA) has been considered alternative to CMOS technology that suffers from problems such as leakage current. Moreover, QCA is suitable for multi-valued logic due the simplicity of implementing fuzzy in a way much easier than technology. This paper uses quaternary cell with two isolated layers because requiring three particles design t...

Quantum-dot cellular automata (QCA) technology is believed to be a good alternative CMOS technology. This nanoscale can provide platform for design and implementation of high performance power efficient logic circuits. However, the fabrication QCA circuits susceptible faults appearing in this form missing cells, additional rotated cells displaced cells. Over years, several solutions have been p...