Long-range photonic device-independent quantum key distribution using SPDC sources and linear optics

• URL: http://arxiv.org/abs/2507.23254v1
• Date: Thu, 31 Jul 2025 05:23:27 GMT
• Title: Long-range photonic device-independent quantum key distribution using SPDC sources and linear optics
• Authors: Morteza Moradi, Maryam Afsary, Piotr Mironowicz, Enky Oudot, Magdalena Stobińska,
• Abstract summary: Device-independent quantum key distribution (DI QKD) offers unparalleled cryptographic security.<n>We propose the first experimentally viable schemes for long-distance DI QKD using two fully photonic approaches.
• Score: 1.4913052010438639
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Device-independent quantum key distribution (DI QKD) offers unparalleled cryptographic security by eliminating trust requirements for quantum devices, yet has remained impractical for long-distance implementation due to fundamental rate limitations. Here, we propose the first experimentally viable schemes for long-distance DI QKD using two fully photonic approaches with heralded entanglement distribution using spontaneous parametric down-conversion (SPDC) sources. Both schemes achieve key rate scaling with the square root of channel transmissivity $\eta_t$, matching the twin-field protocol advantage rather than the prohibitive linear decay of conventional QKD. We demonstrate positive key rates at detector efficiencies as low as 83\%, bringing DI QKD within reach of the current superconducting detector technology. Our security analysis employs the Entropy Accumulation Theorem to establish rigorous finite-size bounds, while numerical optimization yields custom Bell certificates that surpass standard approaches by 2--3 times at maximum transmission distances. 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.

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