Entanglement and Nonunitary Evolution

Details Entanglement and Nonunitary Evolution Entanglement and Nonunitary Evolution

2006-09-11

arxiv.org/abs/hep-th/0609075v2

JHEP 0704:086,2007

Physics

High Energy Physics

High Energy Physics - Theory

14 pages, 1 figure; Added a clarification regarding the relation with black hole physics

Scientific paper

10.1088/1126-6708/2007/04/086

We consider a collapsing relativistic spherical shell for a free quantum field. Once the center of the wavefunction of the shell passes a certain radius R, the degrees of freedom inside R are traced over. We show that an observer outside this region will determine that the evolution of the system is nonunitary. We argue that this phenomenon is generic to entangled systems, and discuss a possible relation to black hole physics.

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