Quantum Key Distribution: A Brief Overview 🔑

A very brief summary on what Quantum Key Distribution (QKD) is about. It omits deeper concepts involved in QKD such as detection, sifting, error correction (because the key is never perfectly correct due to accidental coincidences) & privacy amplification (to reduce the adversary's information using the leftover hash lemma), but hopefully it should convey a very high level idea of what QKD is.