Abstract
Experiments on single nitrogen–vacancy (N–V) centres in diamond, which include electron spin resonance1, Rabi oscillations2, single-shot spin readout3 and two-qubit operations with a nearby13C nuclear spin4, show the potential of this spin system for solid-state quantum information processing. Moreover, N–V centre ensembles can have spin-coherence times exceeding 50 μs at room temperature5. We have developed an angle-resolved magneto-photoluminescence microscope apparatus to investigate the anisotropic electron-spin interactions of single N–V centres at room temperature. We observe negative peaks in the photoluminescence as a function of both magnetic-field magnitude and angle that are explained by coherent spin precession and anisotropic relaxation at spin-level anti-crossings. In addition, precise field alignment unmasks the resonant coupling to neighbouring ‘dark’ nitrogen spins, otherwise undetected by photoluminescence. These results demonstrate the capability of our spectroscopic technique for measuring small numbers of dark spins by means of a single bright spin under ambient conditions.
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Acknowledgements
We thank O. Gywat for valuable discussions and G. C. Farlow for high-energy electron irradiation of several samples. This work was supported by AFOSR, DARPA/MARCO and ARO.
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Epstein, R., Mendoza, F., Kato, Y. et al. Anisotropic interactions of a single spin and dark-spin spectroscopy in diamond. Nature Phys 1, 94–98 (2005). https://doi.org/10.1038/nphys141
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DOI: https://doi.org/10.1038/nphys141
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