Title data
Lehner, Barbara U. ; Seidelmann, Tim ; Undeutsch, Gabriel ; Schimpf, Christian ; Manna, Santanu ; Gawełczyk, Michał ; Covre da Silva, Saimon F. ; Yuan, Xueyong ; Stroj, Sandra ; Reiter, Doris E. ; Axt, Vollrath Martin ; Rastelli, Armando:
Beyond the Four-Level Model : Dark and Hot States in Quantum Dots Degrade Photonic Entanglement.
In: Nano Letters.
Vol. 23
(2023)
Issue 4
.
- pp. 1409-1415.
ISSN 1530-6992
DOI: https://doi.org/10.1021/acs.nanolett.2c04734
Project information
Project financing: |
Deutsche Forschungsgemeinschaft Funding was received via the Austrian Science Fund (FWF) via the Research Group FG5, P 29603, P 30459, I 4320, I 4380, I 3762, FFG Grant No. 891366, the Linz Institute of Technology (LIT), the LIT Secure and Correct Systems Lab, supported by the State of Upper Austria, the Natural Science Foundation of China (NSFC 12104090) and we used resources provided by the Wroclaw Centre for Networking and Supercomputing (http://wcss.pl), Grant No. 203. |
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Abstract in another language
Entangled photon pairs are essential for a multitude of quantum photonic 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.
Further data
Item Type: | Article in a journal |
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Refereed: | Yes |
Keywords: | Quantum Optics; Quantum Dots; Temperature Dependency; Excited States; Hot States; Entanglement |
Subject classification: | condensed matter physics (theoretical and experimental) |
Institutions of the University: | Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III |
Result of work at the UBT: | Yes |
DDC Subjects: | 500 Science > 530 Physics |
Date Deposited: | 09 Mar 2023 07:41 |
Last Modified: | 09 Jan 2025 08:15 |
URI: | https://eref.uni-bayreuth.de/id/eprint/74146 |