Spin-Light Coherence for Single-Spin Measurement and Control in Diamond

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Science  14 Oct 2010:
DOI: 10.1126/science.1196436


The exceptional spin coherence of nitrogen-vacancy centers in diamond motivates their use in emerging quantum technologies. Traditionally, the spin state of individual centers is measured optically and destructively. We demonstrate dispersive, single-spin coupling to light for both non-destructive spin measurement through the Faraday effect and coherent spin manipulation through the optical Stark effect. These interactions can enable the coherent exchange of quantum information between single nitrogen-vacancy spins and light, facilitating coherent measurement, control, and entanglement that is scalable over large distances.