Chip-to-chip entanglement distribution over 80-km multicore fiber link
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866909000891629568 |
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| author | Roux, Damien Guarda, Giulia Zahidy, Mujtaba Ding, Yunhong Zhou, Siyan Ribezzo, Domenico Munkhbat, Battulga Da Ros, Francesco Bacco, Davide Vigliar, Caterina |
| author_facet | Roux, Damien Guarda, Giulia Zahidy, Mujtaba Ding, Yunhong Zhou, Siyan Ribezzo, Domenico Munkhbat, Battulga Da Ros, Francesco Bacco, Davide Vigliar, Caterina |
| contents | Long-range quantum entanglement is essential for building large-scale quantum networks and unconditionally secure cryptographic systems based on quantum key distribution (QKD). While photonic integrated circuits offer a highly scalable platform, the fragility of phase coherence between spatial modes has prevented the distribution of path-encoded entanglement over long distances. Here, we report chip-to-chip distribution of path-encoded entangled states over 80 km between fully integrated silicon photonic transmitter and receiver chips. Telecom-band entangled photon pairs are generated via spontaneous four-wave mixing in on-chip spiral waveguides and distributed between chips over a dual-core, actively stabilized fiber link. Upon distribution, we measure a Bell state fidelity of $85.7 \pm 0.2 \%$. Implementing the BBM92 protocol with the same source, we obtain a secure key rate of 2.03 bit/s in the infinite-key regime. These results establish silicon photonic chips as a viable platform for long-distance path-encoded entanglement-based quantum key distribution, paving the way toward scalable, device-independent quantum networks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_26791 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Chip-to-chip entanglement distribution over 80-km multicore fiber link Roux, Damien Guarda, Giulia Zahidy, Mujtaba Ding, Yunhong Zhou, Siyan Ribezzo, Domenico Munkhbat, Battulga Da Ros, Francesco Bacco, Davide Vigliar, Caterina Quantum Physics Long-range quantum entanglement is essential for building large-scale quantum networks and unconditionally secure cryptographic systems based on quantum key distribution (QKD). While photonic integrated circuits offer a highly scalable platform, the fragility of phase coherence between spatial modes has prevented the distribution of path-encoded entanglement over long distances. Here, we report chip-to-chip distribution of path-encoded entangled states over 80 km between fully integrated silicon photonic transmitter and receiver chips. Telecom-band entangled photon pairs are generated via spontaneous four-wave mixing in on-chip spiral waveguides and distributed between chips over a dual-core, actively stabilized fiber link. Upon distribution, we measure a Bell state fidelity of $85.7 \pm 0.2 \%$. Implementing the BBM92 protocol with the same source, we obtain a secure key rate of 2.03 bit/s in the infinite-key regime. These results establish silicon photonic chips as a viable platform for long-distance path-encoded entanglement-based quantum key distribution, paving the way toward scalable, device-independent quantum networks. |
| title | Chip-to-chip entanglement distribution over 80-km multicore fiber link |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2604.26791 |