In quantum mechanics, quantum information is physical information that is held in the “state” of a quantum system. The most popular unit of quantum information is the qubit, a two-level quantum system. However, unlike classical digital states (which are discrete), a two-state quantum system can actually be in a superposition of the two states at any given time. Quantum information differs from classical information in several respects, among which we note the following: It cannot be read without the state becoming the measured value, An arbitrary state cannot be cloned, The state may be in a superposition of basis values. However, despite this, the maximum amount of information that can … Continue reading Wikipedia