Quantum-dot cellular automata(QCA) provides a new approach in computer circuit design and development at nanotechnology level. This technology promises extraordinary high computing speeds, low heat dissipation and highly dense circuits. In this paper,two 2:4 decodersare proposed. The proposed structures reduce the clock phases to only three phases making them faster than the designs currently available in literature.The first proposed structure has reduced number of cells and hence covers a small area.The second proposed method although it has more cells, has regular clock zones that can facilitate the implementation of this circuit.Simulation of the circuits was done using QCADesigner.

Abstract. In this paper, we propose a combinational circuit such as decoder using quantum-dot cellular automata. Our circuit reduces both a delay time and a cell space, and it has also regular clock zones. The proposed scheme uses an inverter chain instead of inverter gates in order to minimize an area and time complexity. Our architecture has easy scalability and extension of circuits.

Quantum secret sharing (QSS), quantum secure direct communication, and quantum teleportation, which are all included under quantum key distribution, are used to share or distribute a secure key in a quantum environment. We emphasize cooperation between communicating parties to eliminate un-trustworthy members and to improve the strength of the key.

Abstract. Decoders play an integral role in computer circuits. They are used in computer parts like random access memory(RAM). This paper presents a decoder with enable input. This decoder is developed using Quantum-dot cellular automata(QCA). QCA opens a completely radical way of microelectronics development and a potential replacement of CMOS based electronics. It ensures highly compact circuits, faster processing speeds, low power consumption. The use of clock in QCA provides power gain which is an important feature and this feature is not available in CMOS electronics.

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