Techniques of reversible circuits can be used in low-power microchips and quantum communications. Current most works focuses on synthesis of reversible circuits but seldom for fault testing which is sure to be an important step in any robust implementation. In this study, we propose a Universal Toffoli Gate (UTG) with four inputs which can realize all basic Boolean functions. The all single stuck-at faults are analyzed and a test-set with minimum test vectors is given. Using the proposed UTG, it is easy to implement a complex reversible circuit and test all stuck-at faults of the circuit. The experiments show that reversible circuits constructed by the UTGs have less quantum cost and test vectors compared to other works.
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