Long-range photonic device-independent quantum key distribution using SPDC sources and linear optics
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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866911499655577600 |
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| author | Moradi, Morteza Afsary, Maryam Mironowicz, Piotr Oudot, Enky Stobińska-Moretto, Magdalena |
| author_facet | Moradi, Morteza Afsary, Maryam Mironowicz, Piotr Oudot, Enky Stobińska-Moretto, Magdalena |
| contents | We address the question of the implementation of long-distance device-independent quantum key distribution (DI QKD) by proposing two experimentally viable schemes. Those schemes only use spontaneous parametric down-conversion (SPDC) sources and linear optics. They achieve favorable key rate scaling proportional to the square root of channel transmittance $η_t$, matching the twin-field protocol advantage. We demonstrate positive asymptotic key rates at detector efficiencies as low as 80\%, bringing DI QKD within the reach of current superconducting detector technology. Our security analysis employs the Entropy Accumulation Theorem to establish rigorous finite-size bounds, achieving finite-key rates at a detector efficiency of 90\%. This work represents a critical milestone toward device-independent security in quantum communication networks, providing experimentalists with practical implementation pathways while maintaining the strongest possible security guarantees against quantum adversaries. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_23254 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Long-range photonic device-independent quantum key distribution using SPDC sources and linear optics Moradi, Morteza Afsary, Maryam Mironowicz, Piotr Oudot, Enky Stobińska-Moretto, Magdalena Quantum Physics We address the question of the implementation of long-distance device-independent quantum key distribution (DI QKD) by proposing two experimentally viable schemes. Those schemes only use spontaneous parametric down-conversion (SPDC) sources and linear optics. They achieve favorable key rate scaling proportional to the square root of channel transmittance $η_t$, matching the twin-field protocol advantage. We demonstrate positive asymptotic key rates at detector efficiencies as low as 80\%, bringing DI QKD within the reach of current superconducting detector technology. Our security analysis employs the Entropy Accumulation Theorem to establish rigorous finite-size bounds, achieving finite-key rates at a detector efficiency of 90\%. This work represents a critical milestone toward device-independent security in quantum communication networks, providing experimentalists with practical implementation pathways while maintaining the strongest possible security guarantees against quantum adversaries. |
| title | Long-range photonic device-independent quantum key distribution using SPDC sources and linear optics |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2507.23254 |