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TT: Fachverband Tiefe Temperaturen
TT 20: Quantum Dots and Wires (joint session HL/TT)
TT 20.3: Vortrag
Donnerstag, 30. September 2021, 14:15–14:30, H4
Towards deterministic generation of time-bin entangled photons from GaAs quantum dots — •Florian Kappe1, Yusuf Karli1, Vikas Remesh1, Santanu Manna2, Armando Rastelli2, and Gregor Weihs1 — 1Institute for Experimental Physics, University of Innsbruck, Austria — 2Institute of Semiconductor and Solid State Physics, Johannes Kepler University of Linz, Austria
Semiconductor quantum dots are bright, on-demand single photon sources to realise quantum communication devices. We present our progress towards the deterministic generation of time-bin entangled photon states utilizing single GaAs/AlGaAs quantum dota as photon sources. Our scheme relies on the use of highly chirped picosecond laser pulses and an optically dark exciton state acting as a metastable state. The fidelity of the state preparation is supported by numerical simulations on the quantum dot dynamics. To demonstrate the effect of chirped excitation pulses on the quantum dot, we present an adiabatic-rapid-passage acting on a two-photon resonant transition to the neutral biexciton state. This scheme allows the implementation of a deterministic two-photon source insensitive to power fluctuations of the pump laser.