2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/123665We identify an optical signature for detecting entanglement in experimental nanostructure systems comprising coupled excitonic qubits. This signature owes its strength to non-Markovian dynamical effects in the second-order temporal coherence function of the emitted radiation. We calculate autocorrelation and cross-correlation functions for both selective and collective light excitation, and prove that the coherence properties of the emitted light do indeed carry information about the entanglement of the initial multi-qubit state. We also show that this signature can survive in the presence of a noisy environment.4 pages, 4 color figures. Minor changes. Accepted version to be published in Europhysics LettersMesoscale and Nanoscale PhysicsQuantum Physicstext