His subsequent work with John Rarity and Paul Tapster, from the Defence Research Agency (DRA) in Malvern, resulted in the proof-of-principle experimental quantum key distribution, introducing parametric down-conversion, phase encoding and quantum interferometry into the repertoire of cryptography.
A chance meeting on the ski slopes of the Alps with John Rarity, a scientist at DERA (the UK’s military research organisation), led to a collaboration in which Ekert’s scheme was tested experimentally in the early 90's.
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