Photoneutralization of charges in GaAs quantum dot based entangled photon emitters

authored by: Jingzhong Yang, Tom Fandrich, Frederik Benthin, Robert Keil, Nand Lal Sharma, Weijie Nie, Caspar Hopfmann, Oliver G. Schmidt, Michael Zopf, Fei Ding
Abstract: Semiconductor-based emitters of pairwise photonic entanglement are a promising constituent of photonic quantum technologies. They are known for the ability to generate discrete photonic states on-demand with low multiphoton emission, near-unity entanglement fidelity, and high single photon indistinguishability. However, quantum dots typically suffer from luminescence blinking, lowering the efficiency of the source and hampering their scalable application in quantum networks. In this paper, we investigate and adjust the intermittence of the neutral exciton emission in a GaAs/AlGaAs quantum dot under two-photon resonant excitation of the neutral biexciton. We investigate the spectral and quantum optical response of the quantum dot emission to an additional wavelength tunable gate laser, revealing blinking caused by the intrinsic Coulomb blockade due to charge capture processes. Our finding demonstrates that the emission quenching can be actively suppressed by controlling the balance of free electrons and holes in the vicinity of the quantum dot and thereby significantly increasing the quantum efficiency by 30%.
Organisation(s): QuantumFrontiers
Institute of Solid State Physics
Surfaces Science Section
Laboratory of Nano and Quantum Engineering
External Organisation(s): Leibniz Institute for Solid State and Materials Research Dresden (IFW)
Chemnitz University of Technology (CUT)
Technische Universität Dresden
Type: Article
Journal: Physical Review B
Volume: 105
ISSN: 2469-9950
Publication date: 03.03.2022
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Electronic version(s): https://doi.org/10.48550/arXiv.2110.02346 (Access: Open)
https://doi.org/10.1103/PhysRevB.105.115301 (Access: Closed)

BibTeX

@article{227c615b059b44d7b679a92126d477b2,
title = "Photoneutralization of charges in GaAs quantum dot based entangled photon emitters",
abstract = "Semiconductor-based emitters of pairwise photonic entanglement are a promising constituent of photonic quantum technologies. They are known for the ability to generate discrete photonic states on-demand with low multiphoton emission, near-unity entanglement fidelity, and high single photon indistinguishability. However, quantum dots typically suffer from luminescence blinking, lowering the efficiency of the source and hampering their scalable application in quantum networks. In this paper, we investigate and adjust the intermittence of the neutral exciton emission in a GaAs/AlGaAs quantum dot under two-photon resonant excitation of the neutral biexciton. We investigate the spectral and quantum optical response of the quantum dot emission to an additional wavelength tunable gate laser, revealing blinking caused by the intrinsic Coulomb blockade due to charge capture processes. Our finding demonstrates that the emission quenching can be actively suppressed by controlling the balance of free electrons and holes in the vicinity of the quantum dot and thereby significantly increasing the quantum efficiency by 30%.",
keywords = "quant-ph, cond-mat.mtrl-sci, physics.optics",
author = "Jingzhong Yang and Tom Fandrich and Frederik Benthin and Robert Keil and Sharma, {Nand Lal} and Weijie Nie and Caspar Hopfmann and Schmidt, {Oliver G.} and Michael Zopf and Fei Ding",
note = "Funding Information: The authors thank X. Cao for fruitful discussion and gratefully acknowledge the funding by the German Federal Ministry of Education and Research (BMBF) within the project Q.Link.X (16KIS0869) and QR.X (16KISQ015), the European Research Council (QD-NOMS GA715770) and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy (EXC-2123) QuantumFrontiers (390837967).",
year = "2022",
month = mar,
day = "3",
doi = "10.48550/arXiv.2110.02346",
language = "English",
volume = "105",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Institute of Physics",
number = "11",
}