Minimization of reversible adder circuits

Losing information causes losing power. Information is lost when the input vector cannot be uniquely recovered from the output vector of a combinational circuit. The input vector of reversible circuit can be uniquely recovered from the output vector. In this study we have emphasized on the design of reversible adder circuits that is efficient in terms of gate count, garbage outputs and quantum cost and that can be technologically mapped. It has been analyzed and demonstrated that the results of our proposed adder circuits shows better performance compared to similar type of existing designs. Technology independent equations required to evaluate these circuits have also been given.

The potential demise of a population of adders (Vipera berus) in Smygehuk, Sweden

Abstract.—In 1999 and 2004, we published reports on how the introduction of 20 males into a severely inbred and isolated population of Adders halted its decline towards extinction. The introduction significantly enhanced the population’s genetic variability, which resulted in a dramatic increase in offspring viability and a rapid increase in numbers.