Optically controlled locking of the nuclear field via coherent dark-state spectroscopy

Xiaodong Xu, Wang Yao, Bo Sun, Duncan G. Steel (), Allan S. Bracker, Daniel Gammon and L. J. Sham
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Xiaodong Xu: The H. M. Randall Laboratory of Physics, The University of Michigan, Ann Arbor, Michigan 48109, USA
Wang Yao: The University of Hong Kong
Bo Sun: The H. M. Randall Laboratory of Physics, The University of Michigan, Ann Arbor, Michigan 48109, USA
Duncan G. Steel: The H. M. Randall Laboratory of Physics, The University of Michigan, Ann Arbor, Michigan 48109, USA
Allan S. Bracker: Naval Research Laboratory
Daniel Gammon: Naval Research Laboratory
L. J. Sham: University of California San Diego, La Jolla, California 92093, USA

Nature, 2009, vol. 459, issue 7250, 1105-1109

Abstract: Quantum logic: going against the spin Many of the suggestions for quantum logic devices centre on a single electron spin trapped inside a semiconductor quantum dot, but the coherence is degraded by interactions with the lattice nuclear spins. Xu et al. report a means of suppressing the nuclear spin fluctuations by exploiting the spectroscopic response of the coherent optical dark state associated with the two spin states of an electron. This enables the electron spin coherence to be preserved much longer.

Date: 2009
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DOI: 10.1038/nature08120

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