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

• URL: http://arxiv.org/abs/2507.23254v2
• Date: Sat, 30 Aug 2025 12:13:24 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: Long distance device-independent quantum key distribution (DI QKD)<n>We propose two experimentally viable schemes for QKD.<n>We demonstrate positive key rates at detector efficiencies as low as 81%.<n>This work represents a critical milestone toward device-independent security in quantum communication networks.
• Score: 0.7334784262119398
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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 transmissivity $\eta_t$, matching the twin-field protocol advantage. We demonstrate positive asymptotic key rates at detector efficiencies as low as 81\%, 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 89\%. 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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