Over the holiday period, the arXivblog is running a selection of the most popular posts from 2008
5 August 2008: Quantum communication: when 0 + 0 is not equal to 0
One of the lesser known cornerstones of modern physics is Claude Shannon’s mathematical theory of communication which he published in 1948 while juggling and unicycling his way around Bell Labs.
Shannon’s theory concerns how a message created at one point in space can be reproduced at another point in space. He calls the conduit for such a process a channel and the limits imposed by the universe on this process the channel capacity.