  We suggest that the holographic principle, combined with recent technological
advances in atomic, molecular, and optical physics, can lead to experimental
studies of quantum gravity. As a specific example, we consider the
Sachdev-Ye-Kitaev (SYK) model, which consists of spin-polarized fermions with
an all-to-all complex random two-body hopping and has been conjectured to be
dual to a certain quantum gravitational system. Achieving low-temperature
states of the SYK model is interpreted as a realization of a stringy black
hole, provided that the holographic duality is true. We introduce a variant of
the SYK model, in which the random two-body hopping is real. This model is
equivalent to the origincal SYK model in the large-$N$ limit. We show that this
model can be created in principle by confining ultracold fermionic atoms into
optical lattices and coupling two atoms with molecular states via
photo-association lasers. This development serves as an important first step
towards an experimental realization of such systems dual to quantum black
holes. We also show how to measure out-of-time-order correlation functions of
the SYK model, which allow for identifying the maximally chaotic property of
the black hole.
