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Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 17: Materials and devices for quantum technology I

HL 17.6: Talk

Monday, March 16, 2020, 16:45–17:00, POT 112

Developing a stand-alone fiber-coupled single-photon source emitting in the telecom O-band — •Jan Große1, Anna Musiał2, Nicole Srocka1, Pawel Mrowinski1,2, Kinga Zołnacz2, Oleh Kravets2, Philipp-Immanuel Schneider3, Jacek Olszewski2, Krzysztof Poturaj4, Grzegorz Wójcik4, Paweł Mergo4, Kamil Dybka5, Mariusz Dyrkacz5, Michał Dłubek5, Sven Rodt1, Sven Burger3, Lin Zschiedrich3, Wacław Urbańczyk2, Grzegorz Sek2, and Stephan Reitzenstein11Institute of Solid State Physics, Technical University of Berlin, Berlin, Germany — 2Wrocław University of Science and Technology, Wrocław, Poland — 3JCMwave GmbH, Berlin, Germany — 4Laboratory for Optical Fiber Technology, Maria Curie-Skłodowska University, Lublin, Poland — 5Fibrain Sp. z o. o., Zaczernie, Poland

We report on the development of an advanced SPS demonstrator providing fiber coupled single photons in the telecom O-band around 1300 nm. The quantum emitter consists of redshifted low-density InGaAs QDs grown by MOCVD on top of an AlGaAs/GaAs DBR. The outcoupling of photons is enhanced by micromesas patterned deterministically on pre-selected QDs via in-situ EBL resulting in high single-photon purity with g(2)(0) as low as 3%, and temperature stability of emission up to about 60 K. The on-chip fiber coupling of micromesas uses an optical alignment process based on the interferometric mapping using a special high numerical aperture (NA=0.42) single mode fiber which results in an alignment accuracy of about 50 nm. The chip is cooled to 40 K by a compact Stirling cryocooler.

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