There is a great deal of reason to believe that
the answer is "no", the strongest of which is that
nobody from the future has ever come back in time
to visit us here in the present. That said, some
physicists have speculated about quantum foam,
wormholes in both space and time that are on the
scale of 10-35 meters in size, and
science-fiction writers have further speculated
that by enlarging and stabilizing these wormholes,
it might be possible to use them to teleport
around. So far, this quantum foam is entirely
unobserved, so we aren't even sure that it exists,
let alone that it is possible to enlarge it (or
that it is practically feasible to do so).
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