  Nitrogen Vacancy Center Ensembles are excellent candidates for quantum
sensors due to their vector magnetometry capabilities, deployability at room
temperature and simple optical initialization and readout. This work describes
the engineering and characterization methods required to control all four
Principle Axis Systems (P.A.S.) of NV ensembles in a single crystal diamond
without an applied static magnetic field. Circularly polarized microwaves
enable arbitrary simultaneous control with spin-locking experiments and
collective control using Optimal Control Theory (OCT) in a (100) diamond. These
techniques may be further improved and integrated to realize high sensitivity
NV-based quantum sensing devices using all four P.A.S. systems.

Quantum Physics