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Optically controlled exciton dynamics in coupled quantum dots is studied. We show that the maximally entangled Bell states and Greenberger-Horne-Zeilinger (GHZ) states can be robustly generated by manipulating the system parameters to be at the avoided crossings in the eigenenergy spectrum. The analysis of population transfer is systematically carried out by using a dressed-state picture. In addition to the quantum dot configuration that has been discussed by Quiroga and Johnson Phys. Rev. Lett. 83, 2270 (1999), we show that the GHZ states also may be produced in a ray of three quantum dots with a shorter generation time.
Zhang et al. (Wed,) studied this question.
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