Related papers: Beyond the four-level model: Dark and hot states in quantum dots degrade photonic entanglement

Beyond the four-level model: Dark and hot states in quantum dots degrade photonic entanglement

URL: http://arxiv.org/abs/2212.09529v1
Date: Mon, 19 Dec 2022 15:21:14 GMT
Title: Beyond the four-level model: Dark and hot states in quantum dots degrade photonic entanglement
Authors: Barbara Ursula Lehner, Tim Seidelmann, Gabriel Undeutsch, Christian Schimpf, Santanu Manna, Micha{\l} Gawe{\l}czyk, Saimon Filipe Covre da Silva, Xueyong Yuan, Sandra Stroj, Doris E. Reiter, Vollrath Martin Axt, Armando Rastelli
Abstract summary: Entangled photon pairs are essential for a multitude of photonic quantum applications. We study the polarization entanglement among photon pairs from the biexciton-exciton cascade in GaAs quantum dots at temperatures up to 65 K.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Entangled photon pairs are essential for a multitude of photonic quantum applications. To date, the best performing solid-state quantum emitters of entangled photons are semiconductor quantum dots operated around liquid-helium temperatures. To favor the widespread deployment of these sources, it is important to explore and understand their behavior at temperatures accessible with compact Stirling coolers. Here we study the polarization entanglement among photon pairs from the biexciton-exciton cascade in GaAs quantum dots at temperatures up to 65 K. We observe entanglement degradation accompanied by changes in decay dynamics, which we ascribe to thermal population and depopulation of hot and dark states in addition to the four levels relevant for photon pair generation. Detailed calculations considering the presence and characteristics of the additional states and phonon-assisted transitions support the interpretation. We expect these results to guide the optimization of quantum dots as sources of highly entangled photons at elevated temperatures.

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