The weirdness of quantum teleportation offers a solution for getting
information out of a black hole, should you have dropped something in there
Not exact matches
Likewise, if
black holes act like
information mirrors, as Hayden and Preskill suggested, a particle falling into a
black hole would be followed by an antiparticle coming
out — a partner with the opposite electric charge — which would carry the
information contained in the spin
of the original particle.
One theorist who requested anonymity
out of respect for Hawking says his various solutions for the
black hole information problem pale next to his best work.
Hawking spent much
of his later years trying to figure
out how a
black hole could regurgitate
information — although he also worked on theories
of what triggered the big bang.
The
information would basically remain encoded in an infinite number
of low - energy photons racing to get
out of the
black hole, but stuck at its event horizon by the
black hole's intense gravity, according to a study in Physical Review Letters.
Carroll agrees, but hopes their work «starts us thinking in slightly different ways about what it would mean to get qubits
out [
of a
black hole]», and thus solve the puzzle about what happens to the
information that falls into a
black hole.
By taking the change in the
black hole's spin, and her half
of the Hawking radiation that is emitted after she drops the qubit, Alice can use the rules
of quantum teleportation to work
out the spin
of the qubit she dropped into the
black hole — and hence retrieve
information from beyond the
black hole's event horizon.
Nearly all
of the
information that falls into a
black hole escapes back
out, a controversial new study argues.
Chatwin - Davies and colleagues realized that they could teleport the
information about the state
of an electron
out of a
black hole, too.
The calculation touches on one
of the biggest mysteries in physics: how all
of the
information trapped in a
black hole leaks
out as the
black hole «evaporates.»
When the
black hole evaporates and disappears, it has already preserved the
information of everything that fell into it, radiating it
out into the universe.
Picking
out twisted photons from a
black hole would provide new
information about the objects themselves and provide important tests
of general relativity, says Martin Bojowald, a theoretical physicist at Pennsylvania State University who wrote a commentary on Thidé and his colleagues» work for Nature Physics.
But this conflicted with the laws
of quantum physics, which state that
information about what fell into the
black hole can never be completely wiped
out.
For example, if a
black hole is modelled according to string theory — in which the universe is made
of tiny, vibrating strings rather than point - like particles — there are pretty convincing arguments that say
information can get
out, according to Joseph Polchinski from the University
of California in Santa Barbara, US.
Physicists believe that
information about the contents
of a
black hole radiates
out from its surface in the form
of Hawking radiation.