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| DOI | Resolve DOI: https://doi.org/10.1038/s42005-024-01547-3 |
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| Author | Search for: Pennacchietti, Matteo; Search for: Cunard, Brady; Search for: Nahar, ShlokORCID identifier: https://orcid.org/0009-0002-9850-3302; Search for: Zeeshan, Mohd1; Search for: Gangopadhyay, Sayan; Search for: Poole, Philip J.1ORCID identifier: https://orcid.org/0000-0001-5163-7640; Search for: Dalacu, Dan1; Search for: Fognini, Andreas; Search for: Jöns, Klaus D.ORCID identifier: https://orcid.org/0000-0002-5814-7510; Search for: Zwiller, ValORCID identifier: https://orcid.org/0000-0002-5726-1063; Search for: Jennewein, Thomas; Search for: Lütkenhaus, NorbertORCID identifier: https://orcid.org/0000-0002-4897-3376; Search for: Reimer, Michael E.ORCID identifier: https://orcid.org/0000-0002-1338-1397 |
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| Affiliation | - National Research Council of Canada. Quantum and Nanotechnologies
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| Funder | Search for: Canada First Research Excellence Fund; Search for: Mitacs; Search for: CMC Microsystems; Search for: Natural Sciences and Engineering Research Council of Canada |
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| Format | Text, Article |
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| Abstract | 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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| Publication date | 2024-02-24 |
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| Publisher | Nature Research |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 7de68881-a900-404a-a03f-5e41bab21fc3 |
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| Record created | 2024-06-12 |
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| Record modified | 2024-06-12 |
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