August 4th-7th, 2014
Yukawa Institute for Theoretical Physics, Kyoto University
"CGA master equation and entanglement structure"
Shingo Kukita (QG laboratry, Nagoya University)
We investigate the dynamics of the entanglement between two qubit detectors interacting with a scalar field weakly. To analyze the long time dynamics of the detectors system, the master equation with the rotating wave approximation(RWA) is often used. However, RWA is not suitable for investigating the entanglement between two detectors because this approximation ignores the virtual process, which plays an important roll for entanglement generations. Recenly, to derive master equations, a new approximation called coarse graining approximation(CGA) is proposed. We apply CGA master equation to the two detectors system and analyze the dynamics of the entanglement between detectors for three type of quantum fields (Minkowski vacuum, Minkowski thermal state, de Sitter invariant vacuum). We find the stationary solution of the CGA master equation which corresponds to the equilibrium state of the entanglement.
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