  The coherent control of multi-partite quantum systems presents one of the
central prerequisites in state-of-the-art quantum information processing. With
the added benefit of inherent high-fidelity detection capability, atomic
quantum systems in high-energy internal states, such as metastable noble gas
atoms, promote themselves as ideal candidates for advancing quantum science in
fundamental aspects and technological applications. Using laser-cooled neon
atoms in the metastable $^3$P$_2$ state of state $1s^2 2s^2 2p^5 3s$
(LS-coupling notation) (Racah notation: $^2P_{3/2}\,3s[3/2]_2$) with five
$m_F$-sublevels, experimental methods for the preparation of all Zeeman
sublevels |m_J> = |+2>, |+1>, |0>, |-1>, |-2> as well as the coherent control
of superposition states in the five-level system |+2> ... |-2>, in the
three-level system |+2>, |+1>, |0>, and in the two-level system |+2>, |+1> are
presented. The methods are based on optimized radio frequency and laser pulse
sequences. The state evolution is described with a simple, semiclassical model.
The coherence properties of the prepared states are studied using Ramsey and
spin echo measurements.
