Exploring photon-number-encoded high-dimensional entanglement from a sequentially excited quantum three-level system - Vajner, DA; Kewitz, ND; von Helversen, M; Wein, SC; Karli, Y; Kappe, F; Remesh, V; da Silva, SFC; Rastelli, A; Weihs, G; Anton-Solanas, C; Heindel, T (Optica Quantum, 2025)