In recent years, reversible logic has emerged as a promising computingparadigm having application in low power CMOS, quantum computing,nanotechnology, and optical computing. The classical set of gates such as AND,OR, and EXOR are not reversible. This paper utilizes a new 4 * 4 reversiblegate called TSG gate to build the components of a primitive reversible/quantumALU. The most significant aspect of the TSG gate is that it can work singly asa reversible full adder, that is reversible full adder can now be implementedwith a single gate only. A Novel reversible 4:2 compressor is also designedfrom the TSG gate which is later used to design a novel 8x8 reversible Wallacetree multiplier. It is proved that the adder, 4:2 compressor and multiplierarchitectures designed using the TSG gate are better than their counterpartsavailable in literature, in terms of number of reversible gates and garbageoutputs. This is perhaps, the first attempt to design a reversible 4:2compressor and a reversible Wallace tree multiplier as far as existingliterature and our knowledge is concerned. Thus, this paper provides an initialthreshold to build more complex systems which can execute complicatedoperations using reversible logic.
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