Towards Photon-Number-Encoded High-dimensional Entanglement from a Sequentially Excited Quantum Three-Level System

• DOI: 10.48550/arxiv.2407.05902
• Publication Date: 2024-07-08
• Authors: Daniel A. Vajner; Nils D. Kewitz; Martin von Helversen; Stephen C. Wein; Yusuf Karli; Florian Kappe; Vikas Remesh; Saimon Filipe Cov...; Armando Rastelli; Gregor Weihs; C. Antón; Tobias Heindel
• Keywords: Quantum Physics; Condensed Matter - Mesoscale and Nanoscale Physics; Mesoscale and Nanoscale Physics (cond-mat.mes-hall); FOS: Physical sciences; Quantum Physics (quant-ph); Physics - Optics; Optics (physics.optics)

The sequential resonant excitation of a 2-level quantum system results in the emission state light showing time-entanglement encoded photon-number-basis - notions that can be extended to 3-level systems as discussed recent proposal. Here, we report experimental implementation two-photon process solid-state system, constituted by biexciton-, exciton-, and ground-state semiconductor dot. resulting exhibits entanglement time energy, photon-number basis, which could used information applications, e.g., dense encoding or communication protocols. Performing energy- time-resolved correlation experiments combination with extensive theoretical modelling, are able partially retrieve structure generated state.