= Ekert protocol
{c}
Entanglement-based key distribution that tests correlations with a <Bell inequality>. Equal measurement axes generate correlated key data; other settings test the quantum channel. Authentication, statistical parameter estimation, information reconciliation and <privacy amplification> are needed to turn observed correlations into a secure shared key under specified assumptions.<Quantum cryptography based on Bell's theorem by Artur K. Ekert>[1991 primary proposal]{ref}
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