Quantum Measurement and Control of Single Spins in Diamond

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Science  26 Nov 2010:
Vol. 330, Issue 6008, pp. 1188-1189
DOI: 10.1126/science.1198299

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One of the important advances in quantum physics during the past 25 years has been the development of an ability to make repeated measurements on a single quantum system. This capability began in ion-trapping experiments in the early 1980s (1) and was exploited in studies of the number of photons in a microwave cavity in the early 1990s (2). For quantum computing applications, solid-state implementations provide robust platforms, and phase measurements of single quantum bits in superconducting circuits have been made (3). Neumann et al. (4), in a recent issue, and Buckley et al. (5), on page 1212 of this issue, now report the repeated measurement of single spins in a particular type of defect in diamond—the nitrogen-vacancy (NV) color center—through changes in its fluorescence.