Implementation of all‐optical Toffoli gate by 2D Si–air photonic crystal

2 00 3 The Simplified Toffoli Gate Implementation by Margolus is Optimal

Unitary operations are expressed in the quantum circuit model as a finite sequence of elementary gates, such as controlled-not gates and single qubit gates. We prove that the simplified Toffoli gate by Margolus, which coincides with the Toffoli gate up to a single change of sign, cannot be realized with less than three controlled-not gates. If the circuit is implemented with three controlled-no...

Single spin Toffoli-Fredkin logic gate

Reversible Data Hiding Scheme Using Toffoli Gate

In this paper, we propose a new reversible data hiding scheme without distortion of stego image. In the proposed scheme, Toffoli gate is used in embedding and extraction procedures. This gate provides a distortionless of stego image because it has a characteristic of self-inverse. In the experimental results, the embedding capacity and PSNR of the proposed technique are greater than the previou...

Testable Sequential Circuits using Conservative Toffoli Gate

Testing of Sequential circuits can be done by two test vectors (all 1’s and all 0’s) if the circuits were based on the conservative logic. The circuit is made to be tested by designing the circuit with the help of Reversible logic gates. Toffoli gate is used as reversible gate in this paper. Sequential circuits such as latches, flip flops are designed with the help of conservative logic reversi...

Ultra-Fast All-Optical Symmetry 4×2 Encoder Based on Interface Effect in 2D Photonic Crystal

This paper deals with the design and simulation of all-optical 4×2 encoderusing the wave interference effect in photonic crystals. By producing 4 opticalwaveguides as input and two waveguides as output, the given structure was designed.The size of the designed structure is 133.9 μm2. The given all-optical encoder has acontrast ratio of 13.2 dB, the response time of 0.45 ...