  The room temperature compatibility of the negatively-charged nitrogen-vacancy
(NV-) in diamond makes it the ideal quantum system for a university teaching
lab. Here, we describe a low-cost experimental setup for coherent control
experiments on the electronic spin state of the NV- center. We implement
spin-relaxation measurements, optically-detected magnetic resonance, Rabi
oscillations, and dynamical decoupling sequences on an ensemble of NV- centers.
The relatively short times required to perform each of these experiments (<10
minutes) demonstrate the feasibility of the setup in a teaching lab. Learning
outcomes include basic understanding of quantum spin systems, magnetic
resonance, the rotating frame, Bloch spheres, and pulse sequence development.
