Check out my new paper
An Introduction to Quantum Bayesian Networks for Mixed States
by Robert R. Tucci (arxiv abstract)
The paper is a fairly elementary pedagogical introduction. It’s sort of a prelude to a more researchy paper that I am trying to write next.
I’m very pleased that I was able to draw all the pictures of the paper in LaTex “native” fashion, using only LaTex macros (xypic and cancel). The LaTex Gods have been generous to me once again.
This was the original cover of the paper, but my editor nixed it:
The drawing of a man making snow angels on the sand of a sandbox is of course The Vitruvian Man by Leonardo da Vinci. So why did Leonardo write backwards? Historians don’t know for certain but many believe it was because Leonardo was left-handed and he wanted to write quickly with a quill pen without smudging the ink with his hand.
The drawing of a letter U with an eyeball resting on the fat (classical) leg of the U could have been a sketch done by an abstract modernist painter like Dali or Picasso, or it could have been a depiction of a creature from another planet, the u-tube cyclops?, but it’s really a drawing made by John Archibald Wheeler (professor at Princeton Univ. for almost 40 years, PhD advisor to Richard Feynman, Hugh Everett and many, many others). The drawing symbolizes the feedback between the observer and the observed in quantum mechanics.