Single shot readout of NV detectors for chemically relevant single-molecule magnetic resonance.

点击翻译按钮获取中文摘要

The project aims at to gain an order of magnitude in sensitivity and two orders of magnitude in spectral resolution over the state of the art in nanoscale NMR and EPR experiments detected by NV centers in diamond and to exploit this progress for the detection of chemically relevant spectral features in nano-NMR experiments. This improvement shall be enabled by combining two recently developed techniques for more efficient readout of the NV center electron spin into nanoscale magnetic resonance experiments: single shot spin readout of the NV center by nuclear quantum memories [1] and efficient fluorescence readout by spin-charge conversion [2]. Single shot readout by nuclear quantum memories is a technique to overcome the low detection efficiency of fluorescence readout of the NV center electron spin. It reduces acquisition times by two orders of magnitude or, equivalently, boosts sensitivity by one order of magnitude by storage and repetitive readout of a measurement result in a quantum memory, formed e.g. by the NV center nitrogen nuclear spin. Spin-charge conversion is a related technique for efficient spin readout. It exploits spin-dependent photoionization of the NV center into its neutral charge state, which can be detected with high fidelity by fluorescence readout. In the project, these techniques shall be implemented on shallow NV centers few nanometers below the diamond surface as they are required for sensing of external electron and nuclear spins. Subsequently, they shall be combined to a technique merging the advantages of either implementation. Finally, the improvement in sensitivity shall be exploited to demonstrate spectroscopy of chemically relevant spectral features in a nano-magnetic resonance experiment, such as chemical shifts or J-couplings.