  The effective field theory description of a radiating black hole introduces
redundant degrees of freedom that necessitate annihilation of those modes at
late stages to conserve entropy. The prevailing view is that such effective
process can result in information loss unless the redundant states are
annihilated in maximally entangled pairs, resembling quantum teleportation. In
this Letter, we demonstrate that this view can be relaxed in a new
postselection model. We investigate information recoverability in a radiating
black hole through the non-unitary dynamics that projects the randomly-selected
modes from a scrambling unitary. We show that the model has the merit of
producing the von Neumann entropy of black holes consistent with the island
formula calculation and that information in the black hole interior can be
decoded from the Hawking radiation without loss after the Page time. Moreover,
in this model the Page time gains a new interpretation as the transition point
between two channels of information transmission when sufficient amounts of
effective modes are annihilated inside the horizon. We present two decoding
strategies along with their quantum circuit realizations. The experimental
verification of the strategies employs 7-qubit IBM quantum processors,
demonstrating the viability of these strategies and the potential for quantum
processors to probe the black hole interior.
