By Alex Wilkins
Time can flow in multiple directions, according to quantum physicsFidan/iStockPhoto/Getty Images
A quantum experiment that sees a particle of light travel both forwards and backwards in time, at the same moment, is yet another example of the weirdness of the quantum realm. Although this experiment, which has been demonstrated by two research groups, has no immediate practical use, it could eventually have implications for quantum computers or even help develop a theory of quantum gravity.
Unlike our one-way sense of time, the laws of quantum physics are indifferent to the way things …
