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DOI | Trouver le DOI : https://doi.org/10.1038/s42005-024-01547-3 |
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Auteur | Rechercher : Pennacchietti, Matteo; Rechercher : Cunard, Brady; Rechercher : Nahar, ShlokIdentifiant ORCID : https://orcid.org/0009-0002-9850-3302; Rechercher : Zeeshan, Mohd1; Rechercher : Gangopadhyay, Sayan; Rechercher : Poole, Philip J.1Identifiant ORCID : https://orcid.org/0000-0001-5163-7640; Rechercher : Dalacu, Dan1; Rechercher : Fognini, Andreas; Rechercher : Jöns, Klaus D.Identifiant ORCID : https://orcid.org/0000-0002-5814-7510; Rechercher : Zwiller, ValIdentifiant ORCID : https://orcid.org/0000-0002-5726-1063; Rechercher : Jennewein, Thomas; Rechercher : Lütkenhaus, NorbertIdentifiant ORCID : https://orcid.org/0000-0002-4897-3376; Rechercher : Reimer, Michael E.Identifiant ORCID : https://orcid.org/0000-0002-1338-1397 |
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Affiliation | - Conseil national de recherches du Canada. Quantique et nanotechnologies
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Bailleur de fonds | Rechercher : Canada First Research Excellence Fund; Rechercher : Mitacs; Rechercher : CMC Microsystems; Rechercher : Natural Sciences and Engineering Research Council of Canada |
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Format | Texte, Article |
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Résumé | An on-demand source of bright entangled photon pairs is desirable for quantum key distribution (QKD) and quantum repeaters. The leading candidate to generate such pairs is based on spontaneous parametric down-conversion (SPDC) in non-linear crystals. However, its pair extraction efficiency is limited to 0.1% when operating at near-unity fidelity due to multiphoton emission at high brightness. Quantum dots in photonic nanostructures can in principle overcome this limit, but the devices with high entanglement fidelity (99%) have low pair extraction efficiency (0.01%). Here, we show a measured peak entanglement fidelity of 97.5% ± 0.8% and pair extraction efficiency of 0.65% from an InAsP quantum dot in an InP photonic nanowire waveguide. We show that the generated oscillating two-photon Bell state can establish a secure key for peer-to-peer QKD. Using our time-resolved QKD scheme alleviates the need to remove the quantum dot energy splitting of the intermediate exciton states in the biexciton-exciton cascade. |
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Date de publication | 2024-02-24 |
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Maison d’édition | Nature Research |
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Licence | |
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Dans | |
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Langue | anglais |
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Publications évaluées par des pairs | Oui |
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Exporter la notice | Exporter en format RIS |
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Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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Identificateur de l’enregistrement | 7de68881-a900-404a-a03f-5e41bab21fc3 |
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Enregistrement créé | 2024-06-12 |
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Enregistrement modifié | 2024-06-12 |
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