Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 27: Quantum Dots and Wires: Optics II

HL 27.5: Talk

Wednesday, March 20, 2024, 10:45–11:00, EW 202

Quantum dot single-photon source in the telecom C-band with high brightness and indistinguishability — •Wolfgang Fischer, Raphael Joos, Stephanie Bauer, Christian Rupp, Ponraj Vijayan, Michael Jetter, Simone L. Portalupi, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen (IHFG), Center for Integrated Quantum Science and Technology (IQST) and SCoPE, Universität Stuttgart, Allmandring 3, 70569 Stuttgart, Germany

High efficiency sources of non-classical light in the telecom C-band represent a key building block in long-distance, fiber-based, quantum technology implementations, as quantum information and cryptography. Bright emission of pure single photons, with high coherence represent properties generally required in those quantum applications. In this work, we present a telecom C-band single-photon source consisting of an InGaAs quantum dot (QD) coupled to a circular Bragg grating (CBG). Under coherent excitation via the SUPER scheme as well as under incoherent, phonon-assisted excitation a high single photon purity as well as an excellent brightness is achieved. Simultaneously, a high indistinguishability is shown, supported by the CBG causing a Purcell enhancement. In order to further boost the indistinguishability, we implement a sub-GHz etalon filter representing the line width of the filtered source. Consequently, a further improvement of the indistinguishability as well as single photon purity is observed combined with still high brightness [1]. [1] Joos, R., arXiv:2310.20647v1, 2023

Keywords: Single Photons; Telecom C-band; Circular Bragg Grating Cavity; Quantum Dot