  Ultracold neutrons (UCNs) are formidable probes in precision tests of
gravity. With their negligible electric charge, dielectric moment, and
polarizability they naturally evade some of the problems plaguing gravity
experiments with atomic or macroscopic test bodies. Taking advantage of this
fact, the qBounce collaboration has developed a technique - gravity resonance
spectroscopy (GRS) - to study bound quantum states of UCN in the gravity field
of the Earth. This technique is used as a high-precision tool to search for
hypothetical Non-Newtonian gravity on the micrometer scale. In the present
article, we describe the recently commissioned Ramsey-type GRS setup, give an
unambiguous proof of principle, and discuss possible measurements that will be
performed.
