Figure 7: Timing sequences of the Fredkin gate.
From: All-optical design for inherently energy-conserving reversible gates and circuits
Input values and output results are presented across time. The three input values A, B and C are shown together with the real values of the outputs A′, B′ and C′. As expected from a Fredkin gate, the value of the output C′ is very similar to the value of the input C. When C=0, the values of A′ and B′ are similar to the values of A and B respectively. When C=1, the values of A′ and B′ are similar to the values of B and A, respectively. Note the time delay of the outputs as a result of the propagation delay over the optical elements.
