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It is strong Coulomb effects in carbon nanotubes that lead to formation ofthe so-called "bright" and "dark" (forbidden one-photon optical transition)exciton states, and dramatically decrease the efficiency of one-photon lightemission via trapping of the carriers by "dark" states. We demonstrate that theproper use of these "bright" and "dark" exciton states with distinctivelydifferent recombination times may turn the situation around: the use of quantumcoherence and multiphoton schemes of excitation potentially not only allow oneto efficiently manipulate the dark states, but can also create conditions forefficient light generation in different frequency regions, produce "slow" or"fast" light, implement quantum light storage, media with a negative refractiveindex, and other quantum-optical regimes. Possible quantum-optical carbonnanotube devices have a potential for suitable performance at elevatedtemperatures, because the binding energies of excitons in single-wallednanotubes are hundreds-of-meV high.

"Dark" vs "Bright" Excitons in Carbon Nanotubes: Applications to Quantum Optics