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    • CommentRowNumber1.
    • CommentAuthorIan_Durham
    • CommentTimeMar 5th 2010
    Based on where the discussion was headed, I renamed the quantum channels page quantum operations and channels (but included suitable redirects) and added a few To Do items (including describing quantum operations) since, in order to fully understand the reversibility stuff, open quantum systems should be discussed. I don't have time right now to fill in all the details, but will hopefully get a chance to sometime in the next few days (spring break is rapidly approaching its end which means my time will get eaten up again...).

    Incidentally, from the open systems stuff I will eventually link to a new page on closed time-like curves (CTCs) since they are (or can be) related and I think category theory might serve to help shed some light on how they function. This brings up the question: why isn't there a relativity section on nLab? I thought John Baez had done some work applying categories to quantum gravity? Maybe no one ever got to it?
    • CommentRowNumber2.
    • CommentAuthorzskoda
    • CommentTimeMar 5th 2010

    People don't have enough time to write, specially topics which they are not thinking right now.

    • CommentRowNumber3.
    • CommentAuthorIan_Durham
    • CommentTimeMar 5th 2010
    Makes sense. Well, if I get some time (hahahaha) maybe I'll re-read some of John's papers and put some stuff up there. :)
    • CommentRowNumber4.
    • CommentAuthorUrs
    • CommentTimeMar 6th 2010

    Ian, modern QFT and TQFT is entirely formulated in category theory and higher category theory.

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