Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 63: Poster: Quantum Dots and Optics

HL 63.55: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P1A

Quasi-resonant pulsed excitation of quantum dots emitting in the telecom O-band — •Jonatan Höschele, Fabian Olbrich, Jan Kettler, Matthias Paul, Simone L. Portalupi, Michael Jetter, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany

Efficient quantum computing and quantum information require high quality single photons. In particular for long distance quantum communication one may want to benefit from low losses in standard fibers at telecom wavelength. QDs have demonstrated to fulfill both requirements: they are sources of high performance single photons and can be grown to reach telecom emission. In our case, we showed efficient emission up to the telecom O-band. This gives the possibility to profit from low absorption and zero dispersion at this wavelength.

While In(Ga)As QDs grown on a GaAs substrate already serve as high quality single-photon sources at 900 nm, sticking to this material system at higher wavelengths gives perspective to equally high performances. The MOVPE-process used to grow the QDs makes our single-photon sources even more industrially relevant.

In order to improve the source performance, we implement a pulsed quasi-resonant excitation scheme, which helps in reducing phonon contribution to pure dephasing and minimizes the time jitter. This yields triggered single-photon emission in the telecom O-Band with high coherence time and small linewidth.