It is well-known that the $(1+1)$ dimensional Schwarzschild and spatially
    flat FLRW spacetimes are conformally flat. This work examines entanglement
    harvesting from the conformal field vacuums in these spacetimes between two
    Unruh-DeWitt detectors, moving along outgoing null trajectories. In $(1+1)$
    dimensional Schwarzschild spacetime, we considered the Boulware and Unruh
    vacuums for our investigations. In this analysis, one observes that while
    entanglement harvesting is possible in $(1+1)$ dimensional Schwarzschild and
    $(1+3)$ dimensional de Sitter spacetimes, it is not possible in the $(1+1)$
    dimensional de Sitter background for the same set of parameters when the
    detectors move along the same outgoing null trajectory. The qualitative results
    from the Boulware and the Unruh vacuums are alike. Furthermore, we observed
    that the concurrence depends on the distance $d$ between the two null paths of
    the detectors periodically, and depending on the parameter values, there could
    be entanglement harvesting shadow points or regions. We also observe that the
    mutual information does not depend on $d$ in $(1+1)$ dimensional Schwarzschild
    and de Sitter spacetimes but periodically depends on it in $(1+3)$ dimensional
    de Sitter background. We also provide elucidation on the origin of the
    harvested entanglement.

    Source link


    Leave A Reply