  It is shown that the internal stationary state of the Schwarzschild black
hole can be represented by a maximally entangled two-mode squeezed state of
collapsing matter and infalling Hawking radiation. The final boundary condition
at the singularity is then described by the random unitary transformation
acting on the collapsing matter field. The outgoing Hawking radiation is
obtained by the final state projection on the total wave function, which looks
like a quantum teleportation process without the classical information
transmitted. The black hole evaporation process as seen by the observer outside
the black hole is now a unitary process but non-local physics is required to
transmit the information outside the black hole. It is also shown that the
final state projection by the evaporation process is strongly affected by the
quantum state outside the event horizon, which clearly violates the locality
principle.
