This is intended to be an introductory book on information entropy. The
concept of information theory is too broad to be captured by single
definition. The term entropy is used in information theory to describe
the amount of uncertainty. The information entropy is a fundamental
quantity, related to thermodynamical entropy, which measures the extent
of single particle density. The information and entropy both depend upon
the choice of probability distribution. Quantum information science will
lead to the creation of a quantum computer to solve problem that could
not be solved by classical computer. The ideas from information theory
have been applied to many problems of science and technology and in
other different fields. Quantum Information entropy plays a crucial role
in stronger formulation of uncertainty relation. The quantum information
entropy of some important potentials is discussed which are widely used
in different fields. The information entropy of these potentials is
studied in position as well as momentum space and uncertainty relations
are verified.