in this paper, based on the coupled-mode and carrier rate equations, a dynamic model and numerical analysis of a multi quantum well (mqw) chirped distributed feedback semiconductor optical amplifier (dfb-soa)  all-optical flip-flop is precisely derived. we have analyzed the effects of strains of qw and mqw and cross phase modulation (xpm) on the dynamic response, and rise and fall times of the ...

We present designs of reversible Peres logic gate and FeynmanDouble logic gate based on all-optical switching by two-photon absorption induced free-carrier injection in silicon add-drop microring resonators. The logic gates have been theoretically analyzed using time-domain coupled-mode theory and all-optical switching has been optimized for low-power (25 mW) ultrafast (25 ps) operation with hi...

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...

Rydberg atom arrays offer flexible geometries of strongly interacting neutral atoms, which are useful for many quantum applications such as simulation and computation. Here, we consider an all-optical gate-based computing scheme the arrays, in auxiliary atoms (wire atoms) used a mean quantum-mechanical remote-couplings among data-qubit optical individual-atom addressing data wire is to construc...

In this paper, we show that anisotropic photosensitive nematic liquid crystals (PNLC) made by incorporating anisotropic absorbing dyes are promising candidates for constructing all-optical elements by virtue of the extraordinarily large optical nonlinearity of the nematic host. In particular, we have demonstrated several room-temperature 'prototype' PNLC-based all-optical devices such as optica...

As energy efficiency becomes a paramount issue in this day and age, reversible computing may serve as a critical step towards energy conservation in information technology. The inputs of reversible computing elements define the outputs and vice versa. Some reversible gates such as the Fredkin gate are also universal; that is, they may be used to produce any logic operation. It is possible to fi...

This thesis is aimed at a fundamental understanding of all-optical signal processing gates based on semiconductor optical amplifiers (SOAs), for their low-power consumption operation in ultrafast frequency region. In particular, modeling of a frequency-dependent electric power consumption in the SOA and suppression of several kinds of output waveform degradations in the ultrafast wavelength con...

In this paper, all-optical logical gates based on mismatched nonlinear two-core fiber couplers are proposed. In these devices, solitonlike logical input pulses are shown to avoid pulse breakup to perform logical operations. The mismatched two-core fiber couplers can be produced through slightly different cores embedded in the same cladding. In this situation, the two cores have different disper...

1 Light and quantum information 2 Photons as qubits, phase shifters, beam splitters, polarization rotations, polarizing beam splitters, interferometers. 2 Two-qubit gates and the KLM scheme 6 Two-photon entanglement, the KLM approach, Clifford operations, two-photon interference, Hong-Ou-Mandel effect, fusion gates. 3 Cluster states 13 From circuits to clusters, single-qubit gates, two-qubit ga...