  The three-qubit conditional swap gate(Fredkin gate) is a universal gate that
can be used to create any logic circuit and has many direct usages. In this
paper, we experimentally realized Fredkin gate with only three transition
pulses in solution of alanine. It appears that no experimental realization of
Fredkin gate with fewer pulses has yet been reported up to now. In addition,
the simple structure of our scheme makes it easy to be implemented in
experiments.
