Unitary solution to a quantum gravity information paradox

T. C. Ralph
Phys. Rev. A 76, 012336 – Published 31 July 2007

Abstract

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.

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  • Received 3 May 2007

DOI:https://doi.org/10.1103/PhysRevA.76.012336

©2007 American Physical Society

Authors & Affiliations

T. C. Ralph

  • Department of Physics, University of Queensland, Brisbane 4072, QLD, Australia

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Issue

Vol. 76, Iss. 1 — July 2007

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