Physics – Quantum Physics
Scientific paper
2010-07-15
Phys. Rev. D 84, 025007 (2011)
Physics
Quantum Physics
Few typos corrected in the text and bibliography updated
Scientific paper
10.1103/PhysRevD.84.025007
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.
Garcia-Patron Raul
Giovannetti Vittorio
Lloyd Seth
Maccone Lorenzo
Shikano Yutaka
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