Development of Nano-Photonic Structure for Implementation of Frequency Encoded Two-State Pauli X Gate

We develop an all-optical two-state Pauli X logic gate, using two-dimensional nano-photonic crystals (PhCs) based on photonic-crystal semiconductor optical amplifier switches (pc-SOA). An all-optical two-state Pauli X logic gate device is implemented by exploiting the cross-gain modulation property of pc-SOA (XGM) and the frequency encoding technique, which is constructed using a nano-structured photonic-crystal-based waveguide formed by a 2D square lattice of GaAsInP rods in the air background. The Pauli X gate is constructed within a two-input–two-output channel system. We confirm the operation of an all-optical two-state Pauli X logic gate by two sets of simulation experiments. For the simulation process, we use the finite-difference-time-domain (FDTD) and plane wave expansion (PWE) techniques. The frequency range of the band gap structure is determined in the transverse electric (TE) mode. The pc-SOA is used here for its highly-packed design, less consuming power, very high power transmission, and very good execution of the logic system. The simulation result at the output channels is also checked with the help of the cross-gain modulation (XGM) process. A two-state all-optical Pauli X gate device has a very fast response time (~1 ps), allowing for very fast optical information processing, which is helpful in the field of quantum computation. The speed of operation is on the order of 1 THz. The confinement of light is controlled and dominated by the nano-photonic crystal-based device (PhCs), and the frequency encoding technique can be exploited to improve the performance of the logic system.