  General relativity as a classical field theory does not predict
gravitationally induced entanglement, as such, recent proposals seek an
empirical demonstration of this feature which would represent a significant
milestone for physics. We introduce improvements to a spin witness protocol
that reduce the highly challenging experimental requirements. After rigorously
assessing approximations from the original proposal [S. Bose et al. Phys. Rev.
Lett. 119, 240401 (2017)], we focus on entanglement witnessing. We propose a
new witness which greatly reduces the required interaction time, thereby making
the experiment feasible for higher decoherence rates, and we show how
statistical analysis can separate the gravitational contribution from other
possibly dominant and ill-known interactions. We point out a potential loophole
and show how it can be closed using state tomography.
