Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 8: Enabling Technologies: Sources of Quantum States of Light I

FM 8.1: Invited Talk

Montag, 23. September 2019, 14:00–14:30, 1010

Quantum dots as sources for quantum light — •Peter Michler — University of Stuttgart, Institute for Semiconductor Optics and Functional Interfaces, Stuttgart, Germany

Semiconductor quantum dots (QD) are appealing as a platform for the generation of ultra-bright and pure single and entangled photon pairs. Applying resonant π-pulse excitation, coherent photons are obtained on-demand, being indistinguishable for successively emitted photons. However, in solid state systems, fluctuating magnetic and electric fields in the mesoscopic environment of a quantum emitter cause emission frequency drifts over several time scales. Even for Fourier-limited photons, these fluctuations broaden the emission spectrum and translate in the observation of reduced indistinguishability once larger time-differences between consecutive photons are considered.

In my talk, I will present a comprehensive study on fluctuations in the emission frequency of single quantum dots under resonant π-pulse excitation. Slow-light spectroscopy is introduced which reveals the total time dependence of spectral disusion processes in a single photon-correlation measurement. This technique will serve as a fast and reliable tool for quantifying the effects of frequency fluctuations, especially to predict and understand the time-dependent photon indistinguishability. Furthermore, recent developments on QD telecom-wavelength quantum light sources are reported.