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Beschreibung: Eine in Saarbrücken vorhandene, kommerziell genutzte Faserstrecke soll für den Austausch von Quanteninformationen im Telekom-Wellenlängenbereich erschlossen werden. Die Arbeiten umfassen Charakterisierung und Stabilisation der Strecke sowie Implementierung der notwendigen Faserkommunikationsinfrastruktur. Darüber hinaus soll ein mobiler Tieftemperaturmessplatz eingerichtet und an die Faserstrecke angeschlossen werden. An diesem sollen ununterscheidbare Photonen erzeugt werden, die mit dem Spinzustand eines SnV-Fehlstellenzentrum in Diamant verschränkt sind. Schließlich soll die Teleportation quantenmechanischer Zustände zwischen dem SnV-Spin und Kalziumionen über die Faserstrecke demonstriert werden.

Ort: Universität des Saarlandes, Lehrstuhl für Quantenoptik

Kontakt: Prof. Dr. Christoph Becher (christoph.becher@physik.uni-saarland.de)

Description: In close cooperation with QR.X partner groups the project at the TU Berlin aims on the development of fiber-coupled spin-photon interfaces based on quantum dot molecules and entangled-photon-pair sources based on quantum dots. The quantum devices are fabricated using in-situ electron beam lithography and other modern nanotechnology processes in order to finally prepare them for direct use in a quantum repeater testbed using on-chip fiber coupling. The project activities also include the design and numerical optimization of the quantum devices and detailed optical and quantum optical studies to evaluate their performance.

Place: Technische Universität Berlin

Contact: Prof. Dr. Stephan Reitzenstein (stephan.reitzenstein@physik.tu-berlin.de)

Description: Within the BMBF funded project QR.X, we fabricate and investigate novel, deterministic quantum light sources and spin-photon interfaces based on III-V quantum dots. These devices will be used for the demonstration of quantum repeater functionalities. Successful candidates will join our multidisciplinary team of researchers and be working on:

• Design and molecular beam epitaxial growth and III-V quantum dot (QD) based single photon sources and spin-photon interfaces on GaAs substrate.
• Structural and basic optical characterization of epitaxial layer structures and quantum devices.

We have several position openings and the designation to a sub-task will be after a personal interview. Starting date is 1st April 2022, or thereafter.

Place: Julius-Maximilians Universität Würzburg

For more information (eg. requirements, benefits, application process) please refer to the official job offer: pdf-download

Description: The candidate will work in the framework of the BMBF-funded coordinated program QR.X on the fabrication of InAs quantum dots and quantum dot molecules by molecular beam epitaxy for applications in quantum communication. The nanostructures will be embedded into GaAs/AlAs heterostructures that allow for electric field tuning of the emission wavelength via an external bias. To enhance the light outcoupling efficiency, the structures are patterned in cooperation with partners within the program employing electron beam lithography and state-of-art etching techniques. A special focus is on device designs that allow for ultrafast electrical state control.

Place: Universität Paderborn

For more information (eg. requirements, benefits, application process) please refer to the official job offer: pdf-download