  Gravity's quantum nature can be probed in a laboratory by witnessing the
entanglement between the two quantum systems, which cannot be possible if
gravity is a classical entity. In this paper, we will provide a simple example
where we can probe the effects of higher dimensions, in particular, the warped
extra dimension of five-dimensional Anti-de Sitter spacetime ($\rm AdS_5$). We
assume that the two quantum harmonic oscillators are kept at a distance $d$ on
a 3-brane (our 4D world) embedded in $\rm AdS_5$, while gravity can propagate
in all five dimensions. We will compute the effective potential due to the
massless and massive gravitons propagating in the warped geometry. We will
compute the entanglement between position and momentum states for both static
and non-static cases. The entanglement enhances compared to the
four-dimensional massless graviton, and it depends now on the $\rm AdS_5$
radius. We will also show that if we would prepare non-Gaussian superposition
states, e.g. spatial superposition of masses of order $10^{-14}-10^{-15}$kg
with a superposition size of ${\cal O}(20)$ micron, we can yield larger
concurrence of order ${\cal O}(0.1)$.
