The e91 protocol is a quantum key distribution scheme that allows two parties to securely share encryption keys through the use of quantum mechanics, specifically relying on the principles of entanglement. This protocol offers a method to establish secure communication channels, as any attempt at eavesdropping will inevitably disturb the quantum states being transmitted, thus alerting the legitimate users. The foundation of e91 lies in the concept of quantum entanglement and the measurement of correlated particle states.
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