Synthesis of reversible sequential circuits is a very new research area. It has been shown that such circuits can be implemented\nusing quantum dot cellular automata. Other work has used traditional designs for sequential circuits and replaced the flip-flops\nand the gates with their reversible counterparts. Our earlier work uses a direct feedback method without any flip-flops, improving\nupon the replacement technique in both quantum cost and ancilla inputs.We present here a further improved version of the direct\nfeedback method.Design examples showthat the proposed method produces better results than our earlier method in terms of both\nquantum cost and ancilla inputs.We also propose the first technique for online testing of single line faults in sequential reversible\ncircuits.
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