Phys. Rev. A 76, 012336 (2007) [5 pages]Unitary solution to a quantum gravity information paradoxReceived 3 May 2007; published 31 July 2007 We consider a toy model of the interaction of a qubit with an exotic space-time containing a timelike curve. Consistency seems to require that the global evolution of the qubit be nonunitary. Given that quantum mechanics is globally unitary, this then is an example of a quantum gravity information paradox. However, we show that a careful analysis of the problem in the Heisenberg picture reveals an underlying unitarity, thus resolving the paradox. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.76.012336
DOI:
10.1103/PhysRevA.76.012336
PACS:
03.67.Lx, 04.20.Gz
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