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QI: Fachverband Quanteninformation
QI 8: Photons and Photonic Quantum Processors
QI 8.3: Talk
Monday, March 18, 2024, 17:15–17:30, HFT-FT 131
Towards Photon-Number-Entanglement from a Sequentially Excited Quantum Three-Level System — •Daniel A. Vajner1, Nils Kewitz1, Carlos Anton-Solanas2, Stephen C. Wein3, Martin von Helversen1, Yusuf Karli4, Vikas Remesh4, Saimon F. Covre da Silva5, Armando Rastelli5, Gregor Weihs4, and Tobias Heindel1 — 1Technical University of Berlin, Berlin, Germany — 2Universidad Autónoma de Madrid, Madrid, Spain — 3Quandela, Massy, France — 4Universität Innsbruck, Innsbruck, Austria — 5Johannes Kepler University Linz, Linz, Austria
As recently demonstrated, the sequential resonant excitation of 2-level quantum systems leads to the generation of time bin modes that are entangled in the photon-number-basis [1]. Here, we extend this notion to 3-level quantum systems, realized by a biexciton in a semiconductor quantum dot that is subject to sequential pulses that are resonant with the two-photon transition. The different decay rates of the exciton and biexciton, in combination with the cascaded emission, lead to the creation of a complex multi-dimensional entangled state which could be used in quantum information applications [2]. By performing energy- and time-resolved correlation experiments, in combination with extensive theoretical modelling and simulations, we analyze the generated state and confirm its high-dimensional structure. This represents a scalable way towards complex and on-demand entangled photonic states.
[1] Wein, Stephen C., et al. Nature Photonics 16.5 (2022): 374-379.
[2] Santos, Alan C., et al. arXiv:2304.08896 (2023).
Keywords: Quantum Dots; Single Photons; entanglement; Quantum Communication; Quantum Technologies