Unitary Solution to a Quantum Gravity Information Paradox

Details Unitary Solution to a Quantum Gravity Information Paradox Unitary Solution to a Quantum Gravity Information Paradox

2007-08-03

arxiv.org/abs/0708.0449v1

Phys.Rev.A76:012336,2007

Physics

Quantum Physics

5 pages

Scientific paper

10.1103/PhysRevA.76.012336

We consider a toy model of the interaction of a qubit with an exotic space-time containing a time-like curve. Consistency seems to require that the global evolution of the qubit be non-unitary. 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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