Gently Probing Spins

Science  22 Dec 2006:
Vol. 314, Issue 5807, pp. 1837d
DOI: 10.1126/science.314.5807.1837d

Photoluminescent and charge-injection methods can determine single electron spin states but do not leave the spin state intact. For quantum information processing based on the spin storage and manipulation, the states need to be left intact after measurement. Berezovsky et al. (p. 1916, published online 9 November) describe the use of optical Kerr rotation that can probe the spin state of a single electron on a quantum dot nondestructively.

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