We unpack why quantum memory is hard (no-cloning, measurement collapse) and how quantum repeaters tame loss by connecting fast photons with slow, stationary qubits. Inside the One-GNB concept—one long-lived memory plus short-lived scratchpad memories—we explore the purification dilemma and why simple strategies can outperform optimal-but-overengineered protocols. From DEJMPS to basic replacement, we explain how heralded entanglement has already reached tens of kilometers and what that means for a practical, secure quantum internet.

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