Abstract
In this paper, we proposed novel plans of quaternary quantum reversible half and full subtractor circuits. The subtractor element is the essential part of the ALU in the digital computational devices. Thus, the improvement of subtractor block has a significant impact on the overall system performance. According to the comparison results, the proposed quaternary quantum half and full subtractor circuits show tremendous improvement in quantum cost, hardware complexity, number of constant input and garbage output as compared to their counterparts. Moreover, for the first time, the quaternary quantum borrow ripple subtractor structure is realized using the proposed quaternary quantum half and full subtractor circuits.
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