Detecting the Curvature of de Sitter Universe with Two Entangled Atoms

摘要: Casimir-Polder interaction arises from the vacuum fluctuations of quantum field that depend on spacetime curvature and thus is spacetime-dependent. Here we show how to use resonance (RCPI) between two entangled atoms detect curvature. We find RCPI static in de Sitter-invariant depends Sitter relevant temperature felt by observer. It characterized a $1/L^2$ power law decay when beyond characteristic length scale associated breakdown local inertial description two-atom system. However, same setup embedded thermal bath Minkowski universe temperature-independent always $1/L$ decay. Therefore, although single atom responds as if it were bathed radiation universe, using distinct difference one can principle distinguish these universes.