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We show how optically-driven coupled quantum dots can be used to preparemaximally entangled Bell and Greenberger-Horne-Zeilinger states. Manipulationof the strength and duration of the selective light-pulses needed for producingthese highly entangled states provides us with crucial elements for theprocessing of solid-state based quantum information. Theoretical predictionssuggest that several hundred single quantum bit rotations and Controlled-Notgates could be performed before decoherence of the excitonic states takesplace.Comment: 3 separate PostScript Figures + 7 pages. Typos corrected. Minor  changes added. This updated version is to appear in PR

Quantum entanglement and information processing via excitons in optically driven quantum dots