QuotePhysicists at the University of Queensland in Australia have used photons - single particles of light - to simulate quantum particles travelling through time and study their behaviour.

They were hoping to find out more about whether time travel would be possible at the quantum level - a theory first predicted in 1991.

http://sciencealert.com.au/news/20142306-25717-2.html

For the likes of macro objects and information, the answer still seems ... no we can't time travel.

All the maths that point to it require a substance that emits negative energy. This substance has not been found and may not exist. Though we still haven't found dark energy and dark matter so never say never.