| Summary: | 碩士 === 國立臺灣大學 === 物理研究所 === 101 === A nanodiamond containing nitrogen-vacancy color center defects presents a chemically stable and nontoxic strong fluorescent marker for bio-imaging applications. In addition, the m = ±1 and m = 0 sublevels of the ground triplet electronic state in a fluorescent diamond nitrogen-vacancy center (NV) are split and separated by 2.87 GHz. This separation can be altered by an external magnetic field. Thus an NV can be utilized as a sensitive magnetometer, and it provides an opportunity to realize MRI with nanometer resolution when introduced in bio samples. The simple electronic structure and 2.87 GHz splitting in the ground triplet electronic spin with relatively long coherence time also make an NV center an attractive candidate for room-temperature frequency quantum bit (frequency qubit) for quantum information processing.
In this thesis we present coherent manipulation on the ground triplet electronic spin states in an NV center in diamond nanocrystal. The Rabi oscillation between the m=±1 and m = 0 sublevels of an NV center was achieved by applying a resonant microwave at 2.87 GHz, following an optical detection. The make sure the coherence is long enough for the quantum amplitude manipulation, a longitudinal relaxation experiment is performed. To verify single NV center in an nanocrystal, a photon antibunching test was utilized. Our investigation here provides a good starting point for further bio-sensing and quantum information applications.
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