Publikace ÚTF

Blackbody radiation contains (on average) an entropy of 3.9± 2.5 bits per photon. If the emission process
is unitary, then this entropy is exactly compensated by “hidden information” in the correlations. We
extend this argument to the Hawking radiation from GR black holes, demonstrating that the assumption
of unitarity leads to a perfectly reasonable entropy/information budget. The key technical aspect of our
calculation is a variant of the “average subsystem” approach developed by Page, which we extend beyond
bipartite pure systems, to a tripartite pure system that considers the influence of the environment.
© 2017 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license