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Quantum Processes Systems, and Information by Michael Westmoreland, Benjamin Schumacher

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7  Information and ebits

7.1 Decoding and distinguishability

image

Communication

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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 image = d, then we will not be able to decode the message reliably ...

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