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HL: Fachverband Halbleiterphysik

HL 47: Focus Session: Quantum Technologies in Deployed Systems II

HL 47.1: Hauptvortrag

Donnerstag, 20. März 2025, 09:30–10:00, H17

Quantum-Dot Quantum Light Sources in Deployed Systems — •Peter Michler — Institute for Semiconductor Optics and Functional interfaces, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Stuttgart, Germany

Quantum photonic networks require sources of single, indistinguishable and entangled photon pairs with high brightness [1]. Semiconductor quantum dots (QDs) hold great promise to meet these requirements. In many foreseen implementations of quantum photonic networks, full- photonic quantum teleportation is a cornerstone, and the photons must be able to propagate over long distances in silica fibers with limited absorption and wave packet dispersion. Photons in the so-called telecom bands will experience minimum absorption (C-band) and dispersion (O-band). Moreover, from a practicable point of view, portable rack single- and entangled photon sources are advantageous in deployed systems.

In this talk, we report on the performance of quantum-dot quantum light sources in deployed fibers [2], and demonstrate quantum teleportation with telecom photons from remote quantum emitters [3]. Moreover, QKD with entangled photons is demonstrated in deployed fibers and the performance of a QD based portable rack single- and entangled photon source, which can be operated down to 4 K, is presented.

References: [1] R. Joos et al., Nano Letters 24, 8626 (2024) [2] T. Strobel et al., Optica Quantum 2, 274 (2024) [3] T. Strobel et al., arXiv:2411.12904 (2024)

Keywords: Quantum dot quantum light sources; Single-photon sources; Entangled photon sources; Quantum teleportation; Quantum communication