By comparing a subset of the photons that Alice sends with what Bob measures, the pair can check for the presence of errors introduced by Eve.

ECONOMIST: Secure cryptography is only as safe as its weakest link

In June 2011, a pair of undercover detectives and an underage informant entered a Hooters restaurant to check to see if the employees there were properly checking for identification when serving alcohol.

CNN: STORY HIGHLIGHTS

The pair told the Sun that they are "ecstatic" but had delayed announcing the pregnancy until a medical check-up confirmed the child was healthy.

BBC: Jordan's two-year-old son Harvey (centre) was born blind

We got to check out those 14 lumens of projection power in a dimly lit room, and came away with a pair of impressions.

ENGADGET: Nikon Coolpix S1100pj and S5100 hands-on Hands-on