Nano-scale Magnetic Resonance Based On Single Solid State Spin At Room Temperature In Diamond

As one of the most important exploring technologies in modern science, the spin magnetic resonance technology is capable of obtaining information of sub-jects composition and structure in an accurate, rapid and non-destructive way. At present nuclear magnetic resonance spectroscopy is the most popular spectroscopy, widely used in scientific research and medical fields. Current spin-magnetic reso-nance spectrometers are based on the principle of ensemble detection and the test object is an ensemble sample containing billions of identical spins. However, at room temperature NMR at nano-scale is still a huge challenge.To achieve the scientific goal, we choose single spins in solids based on NV defect center in diamond-(NV) as the sensitivity magnetic probe. The single NV spin can be easily visualized, polarized and detected with a confocal microscope. Ultra-long spin coherence time for such qubits, even at room temperature, enables it is ultra-sensitivity to external magnetic noise with characteristic frequency. Instead of traditional electrical defect, weak magnetic signals generated by the nano-scale spin system is mapped to coherent state phase, so as to realize high sensitivity signal detection.1. We designed and constructed the S-band Optical Detected Magnetic Reso-nance spectrometers to meet the requirement of the quantum manipulation on single NV spin at room temperature. We implemented the first quantum algorithm on the single spin system. Then, we succeed to transfer the widely used dynamical decoupling technology to our NV system. Then we observed the anomalous decoherence effect in a quantum bath at room temperature, enhanced phase estimation in a multi-pass quantum metrology protocol, and protected quantum gate by continuous dynamical decoupling.2. Based on the above technology, we sensed a dark electron spin located16nm from NV center and manipulated it by Double Electron-Electron Resonance methods. Besides, instead of single nuclear spin, we sensed a single13C-13C nuclear spin dimer located1nm from the NV center and characterized the interaction between the two nuclear spins. These results demonstrate that central spin decoherence under dynamical decoupling control is a feasible probe for NMR structure analysis of single molecules. 3. Application of nuclear magnetic resonance (NMR) spectroscopy to nanoscale samples has remained an elusive goal, achieved only with great experimental effort at subkelvin temperatures. We demonstrated detection of NMR sig-nals from a (5-nanometer)3voxel of various fluid and solid organic samples under ambient conditions. We used an atomic-size magnetic field sensor, a single nitrogen-vacancy defect center, embedded～7nanometers under the surface of a bulk diamond to record NMR spectra of various samples placed on the diamond surface. Its detection volume consisted of only104nuclear spins with a net magnetization of only102statistically polarized spins.