ABSTRACT
This chapter focuses on information measures in nanosystems. Applying the notation to a physical system (hardware), information, in a certain sense, is a measurable quantity, which is independent of the physical medium by which it is conveyed. The most appropriate measure of information is mathematically similar to the measure of entropy, but there is good reason for reversing the sign and stating that information is the negative of entropy in nature as well as in mathematical formulation. The technique of information theory is applied to problems of the extraction of information from systems containing an element of randomness.
