The e91 protocol, proposed by Artur Ekert in 1991, is a quantum cryptographic protocol that uses quantum entanglement to provide secure communication between two parties. This protocol leverages the principles of quantum mechanics to ensure that any attempt at eavesdropping can be detected, thereby allowing users to share secret keys with a high degree of security. It fundamentally changes the way encryption is approached by using quantum states, making it significantly more secure than classical methods.
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