  Ghost imaging is a quantum optics technique that uses correlations between
two beams to reconstruct an image in one beam from photons that do not interact
with the object being imaged. While pairwise (second order) correlations are
usually used to create the image, higher order correlations can be utilized to
improve the performance of ghost imaging. In this paper, we demonstrate higher
order atomic ghost imaging, using entangled ultracold metastable helium atoms
from an s-wave collision halo. We construct higher order ghost images up to 5th
order and show that using higher order correlations can improve the visibility
of the images without impacting the resolution. This is the first demonstration
of higher order ghost imaging with massive particles and the first higher order
ghost imaging protocol of any type using a quantum source.
