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Thanks Joel. No, it won't be (directly) covered. It's one of those things where you accumulate enough other knowledge and it gradually becomes more and more obvious what's going on.
I can't point to a short, self-contained description which makes it obvious. Someone who'd really mastered chapters 2 & (particularly) 4 of my quantum computing textbook would probably have the tools to see it pretty easily. But that's vastly more effort than it's worth.
And, to be honest, I'm not 100% sure it's even quite true - it's a long time since I've looked at chapter 4.
Thanks for the pointers. I think I'll work through the remaining essays as they come out, then maybe move to the book from there :)
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Announcing an experimental new tool for thought 
