All-optical devices have demonstrated a broad range of applications in the communication field. These serve as fundamental building blocks sophisticated integrated circuits. By integrating these into fields such signal processing, chip design, and network computations, it is possible to achieve much more efficient device. This paper describes design all-optical logic gates NAND, NOR, XNOR using...

We demonstrate that a nonlinear directional coupler with special bending of waveguide axes can be used for all-optical switching of polychromatic light with a very broad spectrum covering all of the visible region. The bandwidth of the suggested device is enhanced five times compared with conventional couplers. Our results suggest novel opportunities for the creation of all-optical logical gate...

In recent years, reversible logic has emerged as a promising computing paradigm having its applications in low power computing, quantum computing, nanotechnology, optical computing and DNA computing. The classical set of gates such as AND, OR, and EXOR are not reversible. Recently, it has been shown how to encode information in DNA and use DNA amplification to implement Fredkin gates. Furthermo...

In order to create polarization based entanglement networks of W4 state, we propose an optical setup, which uses only four horizontally polarized photons as resource which implies no entanglement requirement as a resource. This setup can generate target state deterministically, by operating several quantum optical gates, which can be realized with current photonics technology. The setup we prop...

We demonstrate that nonlinear directional coupler with special bending of waveguide axes can be used for all-optical switching of polychromatic light with very broad spectrum covering all visible region. The bandwidth of suggested device is enhanced five times compared to conventional couplers. Our results suggest novel opportunities for creation of all-optical logical gates and switches for po...

Photonic Logic Gates In article number 2204839, Chi-Ming Che and co-workers describe a photonic logic gate device based on supramolecular heterostructures made by phosphorescent Au, Cu, Pt, Pd complexes. The operation is realized an optical waveguiding effect energy transfer among the different building blocks. These gates have high emission anisotropy, low loss, continuously varied colors rang...

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...

We propose a mechanism by which a number of useful all-optical operations, such as switches, diodes, and logic gates, can be performed with a single device. An effective potential well is obtained by modulating the coupling between the waveguides through their separations. Depending on the power of a control soliton injected through the potential well, an incoming soliton will either completely...

We propose a theoretical protocol for preparing four-photon polarization entangled decoherence-free states, which are immune to the collective noise. With the assistance of the cross-Kerr nonlinearities, a two-photon spatial entanglement gate, two controlled-NOT gates, a four-photon polarization entanglement gate are inserted into the circuit, where X homodyne measurements are aptly applied. Co...

Modern digital circuit designing is now focussing on the reversible circuits. It aims towards the designing of low power loss circuits in the area of nanotechnology, quantum computing, optical computing, signal processing etc. This paper presents an optimized two-bit binary comparator based on reversible logic using Feynman, Toffoli, TR, URG and BJN gates. Optimization of the comparator circuit...