Quantum dot Cellular Automata (QCA) is one of the important nano-level technologies for implementation of both combinational and sequential systems. QCA have the potential to achieve low power dissipation and operate high speed at THZ frequencies. However large probability of occurrence fabrication defects in QCA, is a fundamental challenge to use this emerging technology. Because of these vari...

In recent years low power and small size are the keyword in the IC industry. This is where the importance of reversible gate and QCA (Quantum dot cellular automata) comes in. In nonreversible gates there is a definite amount of power loss involved. Interest in reversible computation arises from the desire to reduce heat dissipation, thereby allowing – higher densities and higher speed. The QCA ...

We establish a method for exploring the dynamics of molecular quantum-dot cellular automata QCA devices by hierarchically combining the techniques of quantum chemistry with the nonequilibrium time-dependent coherence vector formalism. Single QCA molecules are characterized using ab initio quantum chemistry methods. We show how to construct a simple model Hamiltonian for each QCA cell based on p...

Quantum-Dot Cellular Automata (QCA) are an emerging field-coupled nanotechnology with remarkable performance and energy efficiency. In order to enable the exploration of this technology, we propose a model for the logic synthesis of QCA circuits that, for the first time, considers and abstracts all main physical aspects—in particular, energy dissipation. To this end, we review in detail how ene...

The present manuscript deals with the realization of Processing In-memory (PIM) computing architecture using Quantum Dot Cellular Automata (QCA) and Akers array. The PIM computing architecture becomes popular due to its effective framework for storage and computation of data in a single unit. Here, we illustrate two input NAND and NOR gate with the help of QCA based Akers Array as case study. 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...

As originally developed by Charles Ragin in The Comparative Method (1987), qualitative comparative analysis (QCA) has been used extensively by comparative and historical sociologists as an effective tool for analyzing data sets of medium-N populations. Like many other methods, however, QCA is atemporal and obscures the sequential nature of paths of causation. QCA ignores the order of events by ...

Important parameters in quantitative coronary angiography (QCA) are the severity and length of the lesion, the radius of the nonstenotic part of the affected vessel segment and the bifurcation angle (in the case of a bifurcation lesion). Unfortunately, QCA results can be influenced by the viewing angles corresponding to the angiographic images used to perform the QCA. To deal with this viewpoin...

OBJECTIVES This study sought to evaluate inter-core lab variability in quantitative coronary angiography (QCA) analysis of bifurcation lesions. BACKGROUND QCA of bifurcation lesions is challenging. To date there are no data available on the inter-core lab variability of bifurcation QCA analysis. METHODS The randomized Tryton IDE (Tryton Pivotal IDE Coronary Bifurcation Trial) compared the T...

While still relatively “new”, the quantum-dot cellular automata (QCA) appears to be able to provide many of the properties and functionalities that have made CMOS successful over the past several decades. Early experiments have demonstrated and realized most, if not all, of the “fundamentals” needed for a computational circuit – devices, logic gates, wires, etc. This study introduces the beginn...