  In today's world everyday a new technology which is faster, smaller and more
complex than its predecessor is being developed. The increased number of
transistors packed onto a chip of a conventional system results in increased
power consumption that is why Reversible logic has drawn attention of
Researchers due to its less heat dissipating characteristics. Reversible logic
can be imposed over applications such as quantum computing, optical computing,
quantum dot cellular automata, low power VLSI circuits, DNA computing. This
paper presents the reversible combinational circuit of adder, subtractor and
parity preserving subtractor. The suggested circuit in this paper are designed
using Feynman, Double Feynman and MUX gates which are better than the existing
one in literature in terms of Quantum cost, Garbage output and Total logical
calculations.
