  We investigate the bipartite and multipartite quantum entanglement structure
in gravity and the dual holographic field theory based on the generalized
Rindler wedge formalism. We deduce a separation theorem, which asserts that for
subregions satisfying a certain geometric condition, the bipartite/multipartite
squashed entanglement or the conditional entanglement of multipartite
information vanishes, indicating that these subregions represent separable
states with no quantum entanglement among them. We interpret this fact from the
observer perspective in gravity and show how to probe the entanglement
structure further in this framework by introducing a time cutoff in the
gravitational spacetime. We also present the corresponding dual boundary field
theory interpretation.
