Year: 2024
Type: article
Abstract: A quantum-light source that delivers photons with a high brightness and a high degree of entanglement is fundamental for the development of efficient entanglement-based quantum-key distribution systems. Among all possible candidates, epitaxial quantum dots are currently emerging as one of the brightest sources of highly entangled photons. However, the optimization of both brightness and entanglement currently requires different technologies that are difficult to combine in a scalable manner. In this work, we overcome this challenge by developing a novel device consisting of a quantum dot embedded in a circular Bragg resonator, in turn, integrated onto a micromachined piezoelectric actuator. The resonator engineers the light-matter interaction to empower extraction efficiencies up to 0.69(4). Simultaneously, the actuator manipulates strain fields that tune the quantum dot for the generation of entangled photons with corrected fidelities to a maximally entangled state up to 0.96(1). This hybrid technology has the potential to overcome the limitations of the key rates that plague QD-based entangled sources for entanglement-based quantum key distribution and entanglement-based quantum networks. Supplementary Information: The online version contains supplementary material available at 10.1186/s43593-024-00072-8.
Source: eLight
Authors: Michele B. Rota, Tobias M. Krieger, Quirin Buchinger, Mattia Beccaceci, Julia Neuwirth, Hêlio Huet, Nikola Horová, Gabriele Lovicu, Giuseppe Ronco, Saimon F. Covre da Silva, Giorgio Pettinari, Magdalena Moczała-Dusanowska, Christoph Kohlberger, Santanu Manna, Sandra Stroj, Julia Freund, Xueyong Yuan, Christian Schneider, Miroslav Ježek, Sven Höfling, Francesco Basso Basset, Tobias Huber-Loyola, Armando Rastelli, Rinaldo Trotta
Institutions: Sapienza University of Rome, Johannes Kepler University of Linz, University of Würzburg, Palacký University Olomouc, Universidade Estadual de Campinas (UNICAMP), National Research Council, Vorarlberg University of Applied Sciences, Southeast University, Carl von Ossietzky Universität Oldenburg
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Funders: European Commission, National Natural Science Foundation of China, Grantová Agentura České Republiky, Bundesministerium für Bildung und Forschung, Austrian Science Fund, Sapienza Università di Roma, Österreichische Forschungsförderungsgesellschaft, Univerzita Palackého v Olomouci, Julius-Maximilians-Universität Würzburg, QuantERA, Ministero dell'Università e della Ricerca, Horizon 2020 Framework Programme, Horizon 2020, Fundamental Research Funds for the Central Universities
Awards: G1033374213, G1553679399, G1648780019, G1953887145, Advanced Entanglement from Quantum Dots, G201186828, Hyper-entanglement from ultra-bright photon pair sources (HYPER-U-P-S), G2369155016, G2493967838, G2599072453, G3112983486, G3443510363, G361993928, Photonic network assisted quantum metrology, G3979371216, G4000211638, G4012392158, G4236625155, G4345038503, G4412721572, G4432216727, G4526754241, G4578358810, G4708138710, G5032364540, Twinning in non-Gaussian Physics for Quantum Technology, G5228700557, G5238230596, G5271502856, QuantERA ERA-NET Cofund in Quantum Technologies, G5443090575, G5710329982, G5747948867, G575169067, G5784736367, G5844870200, G5900418550, QuantERA II ERA-NET Cofund in Quantum Technologies, G5985791234, Quantum Repeaters using On-demand Photonic Entanglement, G6624113701, G7335216703, G7648154514, G777498305, Epitaxial GaAs quantum dots: Physics & novel Quantum Devices, G7862804178, G7865681851, Access to European Infrastructure for Nanoelectronics, G8333046479, G880458998
OpenAlex ID: W4400935442