Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 56: Focus Session: Quantum Nanophotonics in Solid State Systems II (joint session HL/TT)

TT 56.5: Vortrag

Mittwoch, 14. März 2018, 10:45–11:00, EW 201

Telecom-wavelength GaAs-based quantum dots for practical single-photon sources — •A Musiał¹, Ł Dusanowski^1,2, P Holewa¹, P Mrowiński¹, A Maryński¹, K Gawarecki¹, N Srocka³, T Heuser³, D Quandt³, A Strittmatter^3,4, S Rodt³, S Reitzenstein³, and G Sek¹ — ¹Faculty of Fundamental Problems of Technology, Wrocław Uni of Science and Technology, Wrocław, Poland — ²Technical Physics, Uni of Würzburg, Würzburg, Germany — ³Institute of Solid State Physics, Technical Uni of Berlin, Berlin, Germany — ⁴Institute of Experimental Physics, Otto von Guericke Uni Magdeburg, Magdeburg, Germany

Quantum communication applications require stand-alone, high-purity on-demand single-photon sources (SPS) operating at telecom wavelengths, preferably fiber-coupled for easy integration with existing optical networks. In this regard, we evaluated the potential of GaAs-based quantum dots (QDs) grown by high-throughput and mature MOCVD technology. The emission wavelength was shifted to telecom wavelengths utilizing an InGaAs strain reducing layer. The electronic structure of the QDs was optimized for well-separated ground state exciton emission to allow for high single-photon purity and good thermal stability. Single QDs have been placed deterministically in nanophotonic structures for increased light extraction. The influence of temperature and excitation energy on single-photon generation was studied resulting in triggered high-purity single-photon emission under p-shell resonant excitation at 30K suitable for commercializing fiber-coupled single-photon sources based on cryogenic-free Stirling cryocoolers.