Fra [[Quantum Information Theory]]: > The Shannon Bit, or Shannon binary entropy, is a measure of the surprise upon learning the outcome of a random binary experiment. Thus, the Shannon bit has a completely different interpretation from that of the physical bit. The outcome of the coin flip resides in a physical bit, but it is the information associated with the random nature of the physical bit that we would like to measure. It is this notion of a bit that is important in information theory.