Ask HN: Location of article, geographically separated particles maintaining bond

I am looking for the location of an article I read a year or so ago. I think it was on a reputable scientific journal site. The basic premise of the experiment was that a particle (excuse my poor terminology) was split at a (sub?)atomic level, and the two parts geographically separated (opposite sides of the planet). One particle was acted upon in a lab on one side of the planet, and the particle on the other side of the planet reacted, indicating that they retained a bond of some kind. Thanks :)