Photonic entanglement swapping with remote quantum dots
Year: 2026
Type: article
Abstract: Entanglement swapping is a protocol that details how to create entanglement between previously uncorrelated particles. Its photonic version, mediated by the interference of photon pairs generated by separate quantum systems, finds disparate applications in quantum networks. So far, entanglement swapping with entangled photons from remote systems has been implemented only using probabilistic sources. However, the scaling up of quantum networks requires nonprobabilistic quantum emitters without a trade-off between the degree of entanglement and photon-pair generation rate. Here, we demonstrate photonic entanglement swapping using photon pairs generated by two separate GaAs quantum dots. The emitters are deterministically embedded in hybrid semiconductor-piezoelectric devices that make the entangled photons from two dissimilar quantum dots nearly identical. Entanglement swapping is demonstrated with a fidelity as high as 0.71(2), more than 10 SDs above the classical limit. The experimental data are quantitatively explained by a theoretical model that also suggests how to boost the protocol performance. Our work opens the path to the exploitation of quantum dot entangled-photon sources in quantum repeater networks.
Source: Science Advances
Authors: Mattia Beccaceci, Giuseppe Ronco, Fabrizio Cienzo, Pierpaolo Bassetti, Alessandro Laneve, Francesco Basso Basset, Tobias M. Krieger, Thomas Oberleitner, Quirin Buchinger, Francesco Salusti, Barbara Souza Damasceno, Silke Kuhn, Saimon F. Covre da Silva, Sandra Stroj, Klaus D. Jöns, Sven Höfling, Tobias Huber-Loyola, Armando Rastelli, Michele B. Rota, Rinaldo Trotta
Institutions: Sapienza University of Rome, University of Vienna, Vienna Center for Quantum Science and Technology, Politecnico di Milano, Johannes Kepler University of Linz, University of Würzburg, Paderborn University, Universidade Estadual de Campinas (UNICAMP), Vorarlberg University of Applied Sciences, Karlsruhe Institute of Technology, Center for Integrated Quantum Science and Technology
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,500
Awards: Solid state single-photon sources for telecom frequencies, G2710589720, G2958019218, G3547671086, TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen, G3864777430, G388252207, G434337789, G4347880889, G5302217128, G5443090575, G575169067, G5784736367, QuantERA II ERA-NET Cofund in Quantum Technologies, European Photonic Quantum Computer, Quantum Repeaters using On-demand Photonic Entanglement, G6769686316, G731109193, G777498305, Access to European Infrastructure for Nanoelectronics
OpenAlex ID: W4417296393