“I'm sorry to disappoint science fiction fans, but if information is preserved, there is no possibility of using black holes to travel to other universes. If you jump into a black hole, your mass energy will be returned to our universe but in a mangled form which contains the information about what you were like but in a state where it can not be easily recognized. It is like burning an encyclopedia. Information is not lost, if one keeps the smoke and the ashes. But it is difficult to read. In practice, it would be too difficult to re-build a macroscopic object like an encyclopedia that fell inside a black hole from information in the radiation, but the information preserving result is important for microscopic processes involving virtual black holes.”
"Information Loss in Black Holes" http://arxiv.org/abs/hep-th/0507171 (July 2005)
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Stephen Hawking 122
British theoretical physicist, cosmologist, and author 1942–2018Related quotes

[Black holes and everyday physics, General relativity and gravitation, 14, 4, April 1982, 355–359, 10.1007/BF00756269]

[Black Holes and Entropy, Phys. Rev. D, 7, 8, 2333–2346, 15 April 1973, 10.1103/PhysRevD.7.2333]

"Stephen Hawking at 70: Exclusive interview" http://www.newscientist.com/article/mg21328460.500-stephen-hawking-at-70-exclusive-interview.html in New Scientist, (4 January 2012). In his comment that he "used to think that information was destroyed in black holes", he is referring to the black hole information paradox.