--- title: Relativistic position verification with coherent states description: Researchers demonstrate a secure position verification protocol combining quantum optics with relativistic timing constraints, allowing two verifiers separated... canonical: https://daily.dev/posts/relativistic-position-verification-with-coherent-states-ktfmx14em twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Relativistic position verification with coherent states | daily.dev og:description: Researchers demonstrate a secure position verification protocol combining quantum optics with relativistic timing constraints, allowing two verifiers separated... og:url: https://daily.dev/posts/relativistic-position-verification-with-coherent-states-ktfmx14em og:image: https://api.daily.dev/og/posts/kTFmX14em.png og:image:alt: Relativistic position verification with coherent states og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Relativistic position verification with coherent states **[Nature](https://daily.dev/sources/nature)** · 43 min read · 0 upvotes · 0 comments ## Summary Researchers demonstrate a secure position verification protocol combining quantum optics with relativistic timing constraints, allowing two verifiers separated by 2 km to confirm a prover's physical location without needing to trust the prover. Using phase-randomized weak coherent states instead of single photons, the system achieves position accuracy better than 75 meters. Key engineering advances include a Sagnac-based polarization encoding scheme with 99.73% fidelity, a high-speed FPGA/DDR lookup-table implementation of random Boolean functions supporting 40-bit inputs with sub-120ns latency, and hollow-core fiber links minimizing transmission delay. The work establishes quantum position verification as a practically deployable technology with potential applications in financial authentication, secure facility access, and tracking high-value assets. ## Full article daily.dev links to this article rather than hosting it. 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