Confocal microscope for Quantum computing using NV Center

Abstract

Nitrogen-Vacancy (NV) centers in diamond have been identified as a highly promising system for implementing quantum technology owing to its extended spin coherence duration, operation at room temperature operations, and optical control and readout. In this work, a confocal microscope is constructed and used for exploring both optical and spin features of the NV centers that are useful for quantum computing. With confocal microscope, spatially resolved measurements on single NV centers become possible while also providing a way to efficiently collect photons emitted by them. With this approach, optically detected magnetic resonance (ODMR) experiments are carried out to study the NV center spin-related fluorescence response. Resonance dips arising from the transitions between ground state spins are successfully measured and thus the value of zero field splitting and other perturbing factors are precisely determined. With a fully developed confocal microscope, in the future, many experiments can be designed, such as a multi-qubit gate and entanglement between nuclear and electronic spins. And to work with specially engineered diamonds.