Figure 1: A representation of a three channel gate.
From: All-optical design for inherently energy-conserving reversible gates and circuits
(a) This example shows three inputs denoted by A, and three outputs denoted by B. Four more channels are used for feedback, and denoted by F and F′. The coupling is between seven channels and denoted by M and a red broken box. (b) A zoom on the coupling M. This coupling array couples seven channels: the inputs are three A channels and four F′ channels. Similarly, the outputs are three B channels and four F channels. This coupling is decomposed to 21 couplings between adjacent channels. When F′ is added as an input for the coupling, F is added to the output of the coupling. Each F is then manipulated with an appropriate nonlinear element denoted by γ, which transforms it to F′. Then, F′ is fed back to the system. The column index i represents different states.
