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Originally published in Science Express on 9 November 2006
Science 22 December 2006:
Vol. 314. no. 5807, pp. 1916 - 1920
DOI: 10.1126/science.1133862
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Reports

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

J. Berezovsky, M. H. Mikkelsen, O. Gywat, N. G. Stoltz, L. A. Coldren, D. D. Awschalom*

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.

Center for Spintronics and Quantum Computation, University of California, Santa Barbara, CA 93106, USA.

* To whom correspondence should be addressed. E-mail: awsch{at}physics.ucsb.edu

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