7 Information and ebits
7.1 Decoding and distinguishability
The quantum description of composite systems raises (and resolves!) a few issues about distinguishability and information transfer. We shall deal with these in this section.
The basic decoding theorem from Section 4.1 tells us that, if we try to encode more than d different messages in a quantum system with dim = d, then we will not be able to decode the message reliably ...