Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 64: Poster II

HL 64.19: Poster

Thursday, March 19, 2020, 10:00–13:00, P1A

Comparison of optical excitation schemes for InAs/In(Ga)As/ GaAs quantum dots emitting in the telecom C-band — •Richard Schaber, Cornelius Nawrath, Fabian Olbrich, Michael Jetter, Simone Luca Portalupi, 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

Semiconductor quantum dots (QDs) exhibit excellent non-classical emission properties, most notably high single photon purity and photon indistinguishability values as well as a high fidelity of entangled photon pairs. With these, the essential prerequisites as light sources for applications in quantum communication are fullfilled.

We present InAs/In(Ga)As/GaAs QDs emitting at 1550nm (telecom C-band) wavelengths which matches the absolute absorption minimum of standard silica fibers. Coherence properties of the emitted photons are compared under different optical excitation schemes. Non-resonant (above band) excitation is investigated as well as (quasi-)resonant schemes, highlighting the superior suitability of the latter for possible appplications regarding coherence.