Detection and Elimination of Non-Trivial Reversible Identities

Non-Trivial Reversible Identities (NTRIs) are reversible circuits that have equal inputs and outputs. NTRIs cannot be detected using optimization algorithms in the literature. Existence of NTRIs in a circuit will cause a slow down by increasing the number of gates and the quantum cost. NTRIs might arise due to integration between two or more optimal reversible circuits. In this paper, an algorithm that detects and removes NTRIs in polynomial time will be proposed. Experiments that show the bad effect of NTRIs and the enhancement using the proposed algorithm will be presented.

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