Brian Greene mentioned this might be only a few years away in Fabric of the Cosmos. Assuming others validate this is true, this is a great step forward for String Theory.
Researchers create gravity in lab experiment | Science Blog
Scientists funded by the European Space Agency have measured the gravitational equivalent of a magnetic field for the first time in a laboratory. Under certain special conditions the effect is much larger than expected from general relativity and could help physicists to make a significant step towards the long-sought-after quantum theory of gravity.