Reversible Circuit Synthesis of Symmetric Functions Using a Simple Regular Structure

In this paper, we introduce a new method to realize symmetric functions with reversible circuits. In contrast to earlier methods, our solution deploys a simple and regular cascade structure composed of low-cost gates which enables significant reductions with respect to quantum costs. However, the number of garbage outputs increases slightly. To overcome this, we next propose an optimized design by reusing the garbage outputs. The resulting design thus offers a powerful approach towards reversible synthesis of symmetric Boolean functions.