Quantum memory 'world record' smashedQuantum Computers use the weird behaviour of individual atoms to be in many places at once (described in Quantum Theory), which gives them the potential of awesome power and speed for particular kinds of application.

Although many  fantastical claims that they are the ultimate computer technology are made by journalists who don't understand the technology, quantum computing is definitely an exciting technology which has so far been beset with difficulties in implementation.

This article on BBC News explains recent advances in one of the main hurdles: keeping their processing memory stable at room temperature.