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Abstract-Reversible quantum computer is the best choice for the future computer system. With the advent of quantum computer and reversible logic, design and implementation of all devices has received more attention. BCD digit adder is the basic unit of the more precise decimal computer arithmetic. Several proposals have been given for the BCD adders. This paper proposes a reversible implementation of 2:1 vector MUX and a combined BCD Adder / Subtractor. This paper can be extended to execute more complex operations using reversible logic.Index Terms-BCD adder-subtractor, decimal arithmetic, reversible logic, quantum computer, low-power VLSI

In today's digital era, developing digital circuits is bounded by the research towards investigating various nano devices. This paper provides the design of compact Baugh-Wooley multiplier using reversible logic. Even though various researches have been done for designing reversible multiplier, this work is the first in the literature to use Baugh-Wooley algorithm using reversible logic. In this work, a new 5 × 5 reversible multiplier cell is proposed which will be useful in designing Baugh-Wooley multiplier. The proposed single multiplier cell is able to perform addition of a 1 × 1 product with the sum and carry from the previous cell. This reversible multiplier cell is useful in building up regularity in the array multipliers. The Toffoli gate synthesis of the proposed reversible multiplier cell is also given.

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