Quantum Computation and Information Seminar 

29/06/2006, 15:00 — 16:00 — Room P4.35, Mathematics Building
Francisco Marcos de Assis, U Federal de Campina Grande

Quantum Zero-Error Capacity

The zero-error capacity of a classical discrete communication channel was first defined by Shannon as the least upper bound of rates for which is possible to send encoded information with zero probability of error. This kind of capacity differs from the "ordinary" capacity that requires only asymptotically small error probability. We extend the concept of zero-error capacity for a noisy quantum channel and discuss its main properties. Connections with the theory of quantum noiseless subsystems are established.