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 Reitzenstein1 — 1Institute 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.