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HL: Fachverband Halbleiterphysik

HL 8: Quantum Dots and Wires 2: Optics 1

HL 8.3: Vortrag

Montag, 5. September 2022, 15:45–16:00, H32

Statistical limits for entanglement swapping with independent semiconductor quantum dots — •Jingzhong Yang¹, Michael Zopf¹, Pengji Li¹, Nand Lal Sharma², Weijie Nie², Frederik Benthin¹, Tom Fandrich¹, Eddy Patric Rugeramigabo¹, Caspar Hopfmann², Robert Keil², Oliver. G. Schmidt^2,3,4, and Fei Ding^1,5 — ¹Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany — ²Institute for Integrative Nanosciences, Leibniz IFW Dresden, Helmholtzstraße 20, 01069 Dresden, Germany — ³Material Systems for Nanoelectronics, Technische Universität Chemnitz, 09107 Chemnitz, Germany — ⁴Nanophysics, Faculty of Physics and Würzburg-Dresden Cluster of Excellence ct.qmat, TU Dresden, 01062 Dresden, Germany — ⁵Laboratorium für Nano- und Quantenengineering, Leibniz Universität Hannover, Schneiderberg 39, 30167 Hannover, Germany

Semiconductor quantum dots are promising constituents for future quantum communication. Here we explore the limits for sources of polarization-entangled photons from biexciton-exciton cascade of the quantum dots. We stress the necessity of tuning the exciton fine structure, and explain why the time evolution of photonic entanglement in quantum dots is not applicable for large quantum networks. We identify the critical device parameters and present a numerical model for benchmarking the device scalability in order to bring the realization of distributed semiconductor-based quantum networks one step closer to reality.