All-Optical Control of a Single Electron Spin in Diamond
Fig.1 (A): Optical transitions of the NV center at 7 K. (a) All possible transitions between the ground and excited states, with direct transitions indicated with solid lines, and spin nonconserving cross transitions indicated with dashed lines. (b) Photoluminescence spectrum taken with cw microwave excitation. [©2015 American Physical Society]
Precise coherent control of the individual electronic spins associated with atomlike impurities in the solid state is essential for applications in quantum information processing and quantum metrology. In an editor-suggested Physical Review A article, researchers from Yale, The Element Six Group, and Harvard, including Prof. Mikhail Lukin, demonstrate all-optical initialization, fast coherent manipulation, and readout of the electronic spin of the negatively charged nitrogen-vacancy (NV−) center in diamond at T ∼ 7K. They present the observation of a novel double-dark resonance in the spectroscopy of an individual NV center. These techniques open the door for new applications ranging from robust manipulation of spin states using geometric quantum gates to quantum sensing and information processing.
See Y. Chu, M. Markham, D. J. Twitchen, and M. D. Lukin, "All-optical control of a single electron spin in diamond," Phys. Rev. A 91, 021801(R) (11 Feb 2015) DOI: http://dx.doi.org/10.1103/PhysRevA.91.021801.