The theory of quantum mechanics, developed during the last century, significantly changed our understanding of nature. Based on two of its exotic principles of “Superposition” and “Entanglement”, many different quantum systems have been explored that have experimentally realized quantum technologies- such as quantum computation, communication, and sensing. Defects in diamonds, such as the negatively charged Nitrogen-Vacancy center, offer an attractive platform for realizing these technologies, owing to their atom-like properties in a solid-state host environment. The spin sublevels of the ground state of this NV defect form a qubit with long coherence times even at room temperature. Quantum control of these defects have been demonstrated using well-established optical and microwave techniques such as the Optical Detection of Magnetic Resonance (ODMR). Using ODMR technique, we propose to use diamond-based quantum systems for the demonstration of the NV center as a novel magnetic sensor, and the development of a multi-qubit quantum register for computation and communication.