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From: Sam Wormley on 25 Jul 2010 22:24
The quantum mechanics of time travel through post-selected teleportation
http://arxiv.org/abs/1007.2615

Seth Lloyd, Lorenzo Maccone, Raul Garcia-Patron, Vittorio Giovannetti,
Yutaka Shikano

(Submitted on 15 Jul 2010 (v1), last revised 19 Jul 2010 (this version, v2))

This paper discusses the quantum mechanics of closed timelike curves
(CTC) and of other potential methods for time travel. We analyze a
specific proposal for such quantum time travel, the quantum description
of CTCs based on post-selected teleportation (P-CTCs). We compare the
theory of P-CTCs to previously proposed quantum theories of time travel:
the theory is physically inequivalent to Deutsch's theory of CTCs, but
it is consistent with path-integral approaches (which are the best
suited for analyzing quantum field theory in curved spacetime). We
derive the dynamical equations that a chronology-respecting system
interacting with a CTC will experience. We discuss the possibility of
time travel in the absence of general relativistic closed timelike
curves, and investigate the implications of P-CTCs for enhancing the
power of computation.

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For those that need to have someone tell them what's in the paper:
http://www.sciencenews.org/view/generic/id/61301/title/Taming_time_travel

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