Quantum light from a carbon nanotube
Abstract
We report the first observation of photon antibunching in photoluminescence from a single carbon nanotube. The emergence of a fast luminescence decay component under strong optical excitation together with the observation of antibunching in photon cross-correlation measurements on nanotubes that exhibit two distinct PL lines strongly suggest that exciton localization as well as inhibition of two-exciton generation by Auger processes ensure that nanotubes emit photons predominantly one-by-one. The fact that multi-photon emission probability can be smaller than 5% suggests that carbon nanotubes could be used as a source of single photons for applications in quantum cryptography.Keywords
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