In April of this year I wrote about how quantum cryptography (more properly called Quantum Key Distribution or QKD) was leaving the laboratory bench and is balanced on the cusp of entering into real-world use. At the time, many thought I was talking about the far distant future.  However, as is so often the case, people underestimate how rapidly technology moves on. A paper just published by a research group in Cambridge UK could be a game changer for QKD.

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