Low-cost coherent control of NV center qubits in diamond

We present our work on a NV center qubit capable of manipulating the electron spin at room temperature. The setup is based on Nitrogen Vacancy (NV) center in diamond. The negatively charged state of NV center in diamond consists of a nitrogen atom replacing the carbon atom next to a vacancy with spin state of 1. When irradiated by a 532 nm laser, the fluorescence of NV center is at 637 nm. The intensity of fluorescence depends on the spin state of the NV center before irradiation. The spin state of the NV center depends on the local magnetic field via Zeeman interaction. By using a proper sequence of nanosecond microwave pulses and measuring the fluorescence intensity, a highly sensitive NV center qubit can be built. We report our progress and design of the NV center qubit, as well as its efficiency in room temperature setting.