CLASSICAL AND QUANTUM INFORMATION TRANSMISSION AND INTERACTIONS

摘要

Quantum information theory has recently been enlarged to include the use of quantum channels for the transmission not only of classical information but also of intact quantum states. We survey known upper and lower bounds on the capacity of quantum channels, alone or assisted by one- or two-way classical communication, to transmit intact quantum states, and relation of this capacity on the one hand to classical capacity and on the other to the quantitative theory of entanglement of pure and mixed states.