A Line-Based Parallel Memory for QCA Implementation

Abstract

Abstract-Quantum-dot cellular automata (QCA) has been widely advocated as a new device architecture for nanotechnology. Using QCA, the innovative design of digital systems can be achieved by exploiting the so-called capability of processing-in-wire, i.e., signal manipulation proceeds at the same time as propagation. QCA systems require low power together with the potential for high density and regularity. These features make QCA an attractive technology for manufacturing memories in which the in-wire paradigm can be exploited for storage purposes. This paper proposes a novel parallel memory architecture for QCA implementation. This architecture is based on storing information on a QCA line by changing the direction of signal flow among three clocking zones. Timing of these zones requires two additional clocks to implement a four-step process for reading/writing data to the memory. Its operation has been verified by simulation. It is shown that the requirements for clocking, number of zones, as well as the underlying CMOS circuitry are significantly reduced compared with previous QCA parallel architectures.Index Terms-Emerging technologies, memory architecture, quantum-dot cellular automata (QCA), quantum computing.

Analysis of Novel Comparator Design Using Quantum Dot Cellular Automata (QCA)

“…The polarisation P=+ 1 is used to represent logic '1' and polarisation P=-'1' is used to represent to logic '0'. [1]- [8] [11]. The following fig 1 and fig 2 shows The QCA circuit require clocking not only to control flow of information and synchronisation but actually provides power to run the circuit as there is no external power to drive the cells.…”

A Serial Memory by Quantum-Dot Cellular Automata (QCA)

“…In the single-bit memory design introduced in [18], each QCA line for a memory cell spans three clocking zones, as required to retain its memory value. By increasing the length of the QCA wire over a number of zones (in a number given by a multiple of three), more than 1 bit of data can be stored in the wire.…”

A novel ternary quantum-dot cell for solving majority voter gate problem

“…QCA is a promising nanotechnology that could be used for ultra-fast computing and processing with low power consumption and it would facilitate the fabrication of ultra-dense memory storage which could be used for constructing quantum computers, arithmetic logics and microprocessors (Vankamamidi et al 2005;Azghadi et al 2007;Tehrani and Navi 2009;Tehrani et al 2011). One of the considerable properties of the QCA is the nanoscale integration which leads to improvement of functional density.…”