Quantum-dot cellular automata ~QCA! may provide a novel way to bypass the transistor paradigm to form ultrasmall computing elements. In the QCA paradigm information is represented in the charge configuration of a QCA cell, which maps naturally to a binary model. Molecular QCA implementations are being explored where the quantum dots in the cell take the form of redox centers in a molecule. Cloc...

Quantum cellular automata (QCA) is expected to provide highly dense nanotechnology implementations of logic. However, unlike the CMOS technology, the designs in QCA are constrained by the limited number of basic gate structures. This paper describes an important new basic building block, a five input majority gate (MAJ5) in QCA technology. Many new functions can be directly implemented in a sin...

In this paper, we discuss arithmetic structures based on quantum cellular automata (QCA). By taking advantage of the unique capabilities of QCA we are able to design interesting computational architectures. We describe important design considerations and show how addition and multiplication circuits can be implemented using QCADesigner, a QCA design tool which has been developed in our laborato...

Quantum dot Cellular Automata (QCA) technology is a possible CMOS substitute. It requires a clock-like signal to assure information propagation. This likens a QCA circuit to a fully pipelined architecture, where pipeline depth is layout dependent. Only asynchronous organization of architectural blocks enables the realization of complex circuits. The use of Null Convention Logic (NCL) is one amo...

Quantum-dot cellular automata (QCA) are a transistorless computation approach which encodes binary information via configuration of charges among quantum dots. The fundamental QCA logic primitives are majority and inverter gates which can be utilized to design various QCA circuits. This study presents a novel approach to designing efficient QCA-based circuits based on Boolean expressions achiev...

Quantum dot Cellular Automata (QCA) is an emerging digital logic representation techniques and one of the possible alternatives to Complementary Metal–Oxide–Semiconductor (CMOS) technology. It satisfies attractive circuit components of smaller size and low power dissipation of new circuit design technologies. Quantum dots are nano architecture and it works based on columbic interaction between ...

A Quantum Cellular Automaton (QCA) is a nanotechnology which is an attractive alternative for transistor based technologies in the near future. A new seven input majority gate in quantum dot cellular automata is proposed in this paper. The basic elements in QCA are majority and inverter gates, therefore using a majority gate with more inputs in QCA circuit will cause reduction in cell count, la...

Quantum-dot cellular automata (QCA) is an emerging technology proposed in response to the limitations of CMOS technology. Moreover, static RAM (SRAM) crucial for memory design, and efficient design can play a significant role. This paper proposes fault-tolerant QCA SRAM cell based on three- five-input majority gates. implemented single layer does not require any rotated cell, which significantl...

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 ...