//! Quantum communication protocols.
//!
//! Implements three canonical quantum networking protocols:
//! - **BB84 QKD**: Bennett-Brassard 1984 quantum key distribution with eavesdropping detection
//! - **E91 QKD**: Ekert 1991 entanglement-based QKD with CHSH Bell test
//! - **Quantum teleportation + entanglement swapping**: single-hop and n-hop chain
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