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Optoelectronics and Quantum Devices

Schematic view of a single-photon source. A single quantum dot is sandwiched in between a distributed Bragg reflector and a deterministically fabricated microlens for an enhanced photon-extraction efficiency.
Lupe [1]

The research activities of our group focus on quantum optics, quantum light sources, and optoelectronic devices based on micro- and nanostructures in III-V semiconductor materials. Of particular interest are quantum dots that provide zero-dimensional carrier confinement and as such can act as single-photon emitters with very high quantum efficiency. These unique features are exploited to investigate light-matter interaction effects in the framework of cavity quantum-electrodynamics (cQED). For this purpose, the quantum dots are integrated into optically- and electrically-driven low-mode-volume micro- and nanocavities to control and enhance their emission features. The related cQED effects allow us to develop building blocks for future quantum communication systems such as efficient quantum light sources and low-threshold microlasers. We also develop lithographic techniques for the deterministic 3D structuring of semiconductors for enhanced on-chip functionality (cf. schematic images on the right).

Medieninformationen zu ausgewählten Highlights

  • 26.01.2022 - "A Quantum Key Distribution Testbed using a Plug & Play Telecom-wavelength Single-Photon Source", T. Gao et al, Applied Physics Reviews 9, 011412 (2022) publised as AIP Scilight: "Quantum dot device provides single photons, a building block for future communication networks" [2]
  • 07.07.2021 - König Willem-Alexander und Königin Máxima der Niederlande zu Gast an der TU Berlin [3]
  • 16.04.2021 -"Developing a photonic hardware platform for brain-inspired computing based on 5 × 5 VCSEL arrays", T. Heuser et al, J. Phys. Photonics 2 044002, 2020 selected for JPhys Photonics Highlights of 2020 [4]
  • 17.11.2020 - "Quantum integrated photonic circuits" [5]
  • 25.06.2020 - "Auf dem Weg zu einer sicheren Datenübertragung" [6]
  • 10.06.2020 - Front Cover: Plug and Play Fiber-Coupled 73 kHz Single-Photon Source Operating in the Telecom O-Band (Adv. Quantum Technol. 6/2020) [7]
  • 08.06.2020 - "Deterministically fabricated quantum dot single-photon source emitting indistinguishable photons in the telecom O-band" selected as Editor's Pick [8]
  • 20.04.2020 - AIP Publishing is temporarily making content freely available to scientists and students [9]
  • 24.03.2020 - "Tools for the performance optimization of single-photon quantum key distribution" [10]
  • 30.08.2019 - "Indistinguishable Photons from Deterministically Integrated Single Quantum Dots in Heterogeneous GaAs/Si3N4 Quantum Photonic Circuits" [11]
  • 03.05.2019 - "A stand-alone fiber-coupled single-photon source" one of the top 100 read physics papers for Scientific Reports in 2018 [12]
  • 05.04.2019 - "Mutual coupling and synchronization of optically coupled quantum-dot micropillar lasers at ultra-low light levels" [13]
  • 26.03.2019 - "Micropillar lasers with site-controlled quantum dots as active medium" [14]
  • 13.03.2019 - "Wigner Time Delay Induced by a Single Quantum Dot" [15]
  • 11.09.2018 - Millionenförderung für TU-Nachwuchswissenschaftler [16]
  • 30.7.2018 - "Spezieller Detektor misst die exakte Anzahl von Photonen in einem schwachen Lichtpuls" [17]
  • 25.7.2018 - "Synopsis: Counting Photons from a Polariton Condensate" [18]
  • 20.7.2018 - "Neue Anwendungen für Mikrolaser in der Quanten-Nanophotonik" [19]
  • 16.02.2018 - Scilight on Kaganskiy et al.: Micropillars with a controlled number of site-controlled quantum dots [20]
  • 15.02.2018 - "Lasing am Limit" [21]
  • 10.02.2018 - "Schlüssel aus dem Schub" [22]
  • 26.01.2018 - Nature Photonics Research Highlight Report zu "Dark exciton study" [23]
  • 25.01.2018 - Publikation "A stand-alone fiber-coupled single-photon source" [24]
  • 16.01.2018 - Publikation "Accessing the dark exciton spin in deterministic quantum dot microlenses" [25]
  • 25.08.2017 - "Unveiling the physics of microcavity lasers" [26]
  • 03.04.2017 - Publikation "A bright triggered twin-photon source in the solid state" [27]
  • 09.03.2017 - Publikation "On-chip optoelectronic feedback in a micropillar laser-detector assembly" [28]
  • 16.07.2015 - Publikation "Highly indistinguishable photons from deterministic quantum-dot microlenses utilizing 3D in situ electron-beam lithography" [29]
  • 12.02.2014 - Verleihung des ERC Consolidator Grants der EU an Prof. Reitzenstein [30]
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