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We show that Coulomb blockade of resonant tunneling in semiconductor heterojunctions creates correlations between single-charge tunneling and single-photon emission events. The single electron (hole) charging energy has to exceed the characteristic energy of the thermal fluctuations, for these correlations to be observable. The light field generated by the analyzed mesoscopic heterostructure is inherently nonclassical. The effects of quantum confinement and possible applications of the single-electron/single-photon manipulation techniques are discussed.
Imamoḡlu et al. (Sat,) studied this question.