"Entanglement dynamics in de Sitter spacetime"


Shingo Kukita (Nagoya Univ.)


We investigate entanglement of two Unruh DeWitt detectors interacting with a scalar field in de Sitter spacetime in the framework of open quantum systems. In this study, we use a quantum master equation with a time coarse-graining approximation which is related with quantum fluctuations. We find that 1)two distant detectors can be entangled even if the initial state is separable and 2) the entanglement is destroyed after the long-time dynamics. In this presentation, I am going to talk about the above results and discuss a relationship between the entanglement of two detectors and the Hubble parameter.

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