This invention describes a system for sending secret messages using quantum physics. It uses special devices that create and share unique quantum keys based on the state of tiny quantum particles. If someone tries to snoop on the message while it's being sent, the quantum state changes, which automatically scrambles the message data, making it unreadable to the intruder. The system specifically details how two quantum key generators, one for the sender and one for the receiver, synchronize their quantum keys over a quantum communication link to ensure secure decryption.
Why it matters: While still highly complex and expensive, the underlying quantum hardware and communication technologies have seen significant research and development since 2017, making the components described in the claims more tangible, albeit still experimental. The primary obstacle remains the immense cost and technical challenge of building and maintaining such a system.
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