Causality, Entanglement, and Quantum Evolution Beyond Cauchy Horizons

Details Causality, Entanglement, and Quantum Evolution Beyond Cauchy Horizons Causality, Entanglement, and Quantum Evolution Beyond Cauchy Horizons

2003-12-19

arxiv.org/abs/quant-ph/0312160v2

Physics

Quantum Physics

RevTeX, 5 pages, 2 eps figures. Content revised and references added

Scientific paper

We consider a bipartite entangled system half of which falls through the event horizon of an evaporating black hole, while the other half remains coherently accessible to experiments in the exterior region. Beyond complete evaporation, the evolution of the quantum state past the Cauchy horizon cannot remain unitary, raising the questions: How can this evolution be described as a quantum map, and how is causality preserved? The answers are subtle, and are linked in unexpected ways to the fundamental laws of quantum mechanics. We show that terrestrial experiments can be designed to constrain exactly how these laws might be altered by evaporation.

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