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We study the spontaneous emission from a coherently delocalized exciton statein a double quantum dot as a function of the distance between the dots,focusing on the similarities and differences between the cases of radiative(long-range, dipole) and tunnel coupling between the excitons in the dots. Weshow that there may be no qualitative difference between the collectiveemission induced by these two coupling types in spite of their essentiallydifferent physical properties.

Collective spontaneous emission from pairs of quantum dots: long-range vs. short-range couplings