  We propose a microscopic quantum description for Hawking radiation as Andreev
reflections, which resolves the quantum information paradox at black hole event
horizons. The detailed microscopic analysis presented here reveals how a black
hole, treated as an Andreev reflecting mirror, provides a manifestly unitary
description of an evaporating black hole, expanding our previous analysis
presented in [PRD 96, 124011 (2017), PRD 98, 124043 (2018)]; In our analogy, a
black hole resolves the information paradox by accepting particles -- pairing
them with the infalling Hawking quanta into a Bardeen-Cooper-Schrieffer (BCS)
like quantum ground state -- while Andreev reflecting the quantum information
as encoded in outgoing Hawking radiation. The present approach goes beyond the
black hole final state proposal by Horowitz and Maldacena [JHEP 02, 008
(2004)], by providing necessary microscopic details which allows us to
circumvent important shortcomings of the black hole final state proposal. We
also generalize the present Hamiltonian description to make an analogy to the
apparent loss of quantum information possible in an Einstein-Rosen bridge, via
crossed Andreev reflections.
