IBM Fellow Charles Bennett, (developed Reversible Computation and Quantum Teleportation), on how weird physical phenomena discovered in the early 20th century have taught us the true nature of information, and how to process it:
39:30 minute mark: “Entanglement is ubiquitous: Almost every interaction between two systems creates entanglement between them… Most systems in nature… interact so strongly with the environment as to become entangled with it almost immediately.”… 44:00 minute mark: “A classical communications channel is a quantum communication channel with an eavesdropper (maybe only the environment)… A classical computer is a quantum computer handicapped by having eavesdroppers on all its wires.”
See also: Data basic: An introduction to information theory