In the rapidly evolving landscape of quantum information science, the pursuit of secure communication has led to groundbreaking developments, one of which is the E91 protocol. Named after its inventors Artur Ekert, Anton Zeilinger, and Alain Aspect, the E91 protocol is a quantum key distribution (QKD) scheme that exploits the unique phenomenon of quantum entanglement… Continue reading E91 Protocol: Harnessing Entanglement for Secure Communication