Background and Objectives: Recently, photonic crystals have been considered as the basic structures for the realization of various optical devices for high speed optical communication. Methods: In this research, two dimensional photonic crystals are used for designing all optical logic gates. A photonic crystal structure with a triangular lattice is proposed for making NAND, XNOR, and OR optica...

This thesis presents a methodology for optimization of static and domino logic. The optimization techniques that are discussed were developed to improve propagation delay, dissipated power and area for circuit examples while taking noise margin and other constraints into consideration. Where needed, a weighted combination of the these four concerns is used to provide realistic goals and solutio...

We improve the number of T gates needed to perform an n-bit adder from 8n + O(1) [1, 6, 8] to 4n+O(1). We do so via a “temporary logical-AND” construction, which uses four T gates to store the logical-AND of two qubits into an ancilla and zero T gates to later erase the ancilla. Temporary logical-ANDs are a generally useful tool when optimizing T-counts. They can be applied to integer arithmeti...

Proof: We will think of the random circuits we are going to construct as built exclusively of Maj3 gates, that is, gates with fan-in three and unbounded fan-out, which compute the majority function on their three inputs. Because each of these gates can be constructed from four binary AND, OR gates (exercise!), this simplification does not affect the asymptotic size and depth of the circuit. The...

Anatomical optical coherence tomography (aOCT) is an endoscopic imaging modality that can be used to quantify size and shape of the upper airway. We report the application of respiratory gating to aOCT images. Our results show that respiratory gating can reduce motion artefact in upper airway images. Using an error metric based on distance to the dominant reflection in each A-scan, we found not...

In this study, we introduce a design of all-optical module for half-adder/half-subtracter and 2-to-4 decoder that generates simultaneously five of all-optical logic gates at 10 Gbps. These logic gates use dispersion compensation fiber (DCF) based on four-wave mixing (FWM). This design is integrated and economic. The various outputs can be manipulated by controlling nonlinear polarization rotati...

We present experimental results on a new method for ultrafast all-optical logic, which utilizes four-wave mixing on polarization-modulated signals. The technique allows advanced operations such as exclusive-or and three-bit addition with carry bit. Furthermore, we show that on-the-fly error-correction encoding and decoding of a simple Hamming code is achieved when these gates are used on the bi...

Near-term quantum computers are limited by the decoherence of qubits to only being able run low-depth circuits with acceptable fidelity. This severely restricts what algorithms can be compiled and implemented on such devices. One way overcome these limitations is expand available gate set from single- two-qubit gates multi-qubit gates, which entangle three or more in a single step. Here, we sho...

In this paper, a new circuit scheme is proposed to reduce the power consumption of dynamic circuits. In the proposed circuit, an NMOS keeper transistor is used to maintain the voltage level in the output node against charge sharing, leakage current and noise sources. Using the proposed keeper scheme, the voltage swing on the dynamic node is lowered to reduce the power consumption of wide fan-in...

How to reconfigure a logic gate for a variety of functions is an interesting topic. In this paper, a different method of designing logic gates are proposed. Initially, due to the training ability of the multilayer perceptron neural network, it was used to create a new type of logic and full adder gates. In this method, the perceptron network was trained and then tested. This network was 100% ac...