Time travel, such as, say, through a “wormhole,” appears to make it possible to distinguish quantum information that usually can’t be distinguished. That ability would disrupt the absolute security of quantum encryption, theoretical physicist Todd Brun and collaborators report online in the quantum physics archive.

Israeli researchers have developed a theoretical model of a time machine that, in the distant future, could possibly enable future generations to travel into the past.

Physicists are re-exploring the concept of time by thinking about wormholes in space, warp drives and other cosmic constructions, that "absurdly advanced civilizations" might use to travel through time.

Traveling through time may cost less than previously thought, as physicists have found that the amount of an exotic material thought necessary for building a time machine is infinitesimally small.

A brief overview of the discussions within the theoretical physics community on the possibility of time travel.

Scientists provide a 'how-to-guide' for a theoretically acceptable time travel technique.

UConn physicist Ronald Mallett has plans to build a machine to transport a subatomic particle through time. Mallett's experiment will be based ideas introduced in Einstein's theory of gravity, and he hopes to use rotating lasers to warp the space around a particle such as a neutron so that a second neutron from the future would appear.

Ronald Mallett thinks he has found a practical way to make a time machine.
Mallett isn\'t mad. None of the known laws of physics forbids time travel,
and in theory, shunting matter back and forth through time shouldn\'t be that
difficult.