Nondestructive Optical Measurements of a Single Electron Spin in a Quantum Dot

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Science  22 Dec 2006:
Vol. 314, Issue 5807, pp. 1916-1920
DOI: 10.1126/science.1133862

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Kerr rotation measurements on a single electron spin confined in a charge-tunable semiconductor quantum dot demonstrate a means to directly probe the spin off-resonance, thus minimally disturbing the system. Energy-resolved magneto-optical spectra reveal information about the optically oriented spin polarization and the transverse spin lifetime of the electron as a function of the charging of the dot. These results represent progress toward the manipulation and coupling of single spins and photons for quantum information processing.

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