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

• URL: http://arxiv.org/abs/2407.05902v1
• Date: Mon, 8 Jul 2024 13:09:17 GMT
• Title: Towards Photon-Number-Encoded High-dimensional Entanglement from a Sequentially Excited Quantum Three-Level System
• Authors: Daniel A. Vajner, Nils D. Kewitz, Martin von Helversen, Stephen C. Wein, Yusuf Karli, Florian Kappe, Vikas Remesh, Saimon F. Covre da Silva, Armando Rastelli, Gregor Weihs, Carlos Anton-Solanas, Tobias Heindel,
• Abstract summary: We report the experimental implementation of a sequential two-photon resonant excitation process of a solid-state 3-level system. The resulting light state exhibits entanglement in time and energy, encoded in the photon-number basis. We are able to partially retrieve the entanglement structure of the generated state.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The sequential resonant excitation of a 2-level quantum system results in the emission of a state of light showing time-entanglement encoded in the photon-number-basis - notions that can be extended to 3-level quantum systems as discussed in a recent proposal. Here, we report the experimental implementation of a sequential two-photon resonant excitation process of a solid-state 3-level system, constituted by the biexciton-, exciton-, and ground-state of a semiconductor quantum dot. The resulting light state exhibits entanglement in time and energy, encoded in the photon-number basis, which could be used in quantum information applications, e.g., dense information encoding or quantum communication protocols. Performing energy- and time-resolved correlation experiments in combination with extensive theoretical modelling, we are able to partially retrieve the entanglement structure of the generated state.

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