Bonn 2025 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 35: Quantum Information: Concepts and Methods II
QI 35.4: Vortrag
Donnerstag, 13. März 2025, 15:15–15:30, HS IV
Exploring Photon-Number-Encoded High-dimensional Entanglement from a Sequentially Excited Quantum Three-Level System — Daniel A. Vajner1, •Nils D. Kewitz1, Martin von Helversen1, Stephen C. Wein2, Yusuf Karli2, Florian Kappe3, Vikas Remesh3, Saimon F. Covre da Silva4,5, Armando Rastelli4, Gregor Weihs3, Carlos Anton-Solanas6, and Tobias Heindel1 — 1Institute of Solid State Physics, Technische Universität Berlin, Germany — 2Quandela, Massy, France — 3Institut für Experimentalphysik, Universität Innsbruck, Austria — 4Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Austria — 5Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin, Brazil — 6Departamento de Física de Materiales, Instituto Nicolás Cabrera, Instituto de Física de la Materia Condensada, Universidad Autónoma de Madrid, Spain
Here, we experimentally implement a sequential two-photon resonant excitation process driving a solid-state 3-level system, represented by a semiconductor quantum dot [1]. The resulting light state exhibits entanglement in time and energy, encoded in the photon-number basis. Performing energy- and time-resolved correlation experiments together with detailed theoretical modeling, we are able to partially retrieve the entanglement structure of the generated state and extract an upper bound for the fidelity to the entangled target state of F ≤ 70% before loss.
[1] Vajner et al., Optica Quantum, DOI:10.1364/OPTICAQ.538134 (2024)
Keywords: Time-Bin Entanglement; Semiconductor Quantum Dots; High-dimensional Entanglement