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Protocol explainers and guided context
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Compact explainers for QKD protocols and quantum communication primitives, with cautious assumptions and related tools.
Alice and Bob use random bases, discard mismatches, estimate QBER, then reconcile and privacy amplify the sifted key.
Decoy intensities help estimate single-photon yields for weak coherent sources.
Entangled-pair correlations support key generation and Bell-style disturbance checks under idealized assumptions.
An entanglement-based protocol closely related to BB84 with correlated measurement outcomes.
Alice and Bob send states to an untrusted relay, reducing detector side-channel assumptions.
Twin-field protocols use single-photon interference at a middle station to improve distance scaling under strict phase control.
Continuous-variable QKD encodes information in optical quadratures and relies on reconciliation under noise constraints.
An unknown quantum state can be transferred using shared entanglement plus classical feed-forward.
Intermediate Bell measurements create entanglement between nodes that never directly interacted.
Repeaters aim to extend entanglement distribution using memories, swapping, purification, or error correction.