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This invention describes a physical system that creates secret encryption keys using the strange properties of quantum physics, specifically by generating pairs of entangled light particles (photons). These keys can then be sent securely over fiber optic cables to different devices. The system uses a central light source and switch connected to multiple remote receivers, and the claims specifically focus on using photons that are entangled by their polarization or momentum.
Why it matters: Filed before quantum computing threats were widely recognized as imminent. Today, the increasing threat of quantum computers breaking classical encryption makes quantum-safe key generation, as described here, significantly more urgent and relevant.
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