Date Added: Mar 2011
Reversible logic has emerged as one of the most important approaches for power optimization with its application in low power VLSI design. Reversible or information lossless circuits have applications in nanotechnology, digital signal processing, communication, computer graphics and cryptography. They are also a fundamental requirement in the emerging field of quantum computing. In this paper, two new optimized universal gates are proposed. One of them has an ability to operate as a reversible half adder and half subtractor simultaneously. Another one acts only as half adder with minimum transistor count.