  A hybrid quantum state is a combination of the Hartle-Hawking state for the
physical particles and the Boulware state for the non-physical ones (such as
ghosts), as was introduced in our earlier work [1]. We present a
two-dimensional example, based on the RST model, when the corresponding
back-reacted spacetime is a causal diamond, geodesically complete and free of
the curvature singularities. In the static case it shows no presence of the
horizon while it has a wormhole structure mimicking the black hole. In the
dynamical case, perturbed by a pulse of classical matter, there appears an
apparent horion while the spacetime remains to be a regular causal diamond. We
compute the asymptotic radiation both in the static and dynamic case. We define
entropy of the asymptotic radiation and demonstrate that as a function of the
retarded time it shows the behavior typical for the Page curve. We suggest
interpretation of our findings in terms of correlations in the virtual pairs of
physical and non-physical particles spontaneously created in the spacetime.
