  Recent studies using the Unruh-DeWitt detector model have revealed the
quantum signatures of black hole mass superposition. In this paper, we use the
equal-time density-density correlation function to reinvestigate the mass
superposition of BTZ black holes. Interestingly, the quantum signatures of BTZ
black hole mass superposition can be revealed by the equal-time density-density
correlation peaks. Additionally, different mass superpositions for the same
mass ratio can be distinguished, a phenomenon not previously documented.
Specifically, the correlation function method can pinpoint the location where
Hawking radiations are generated, even for mass-superposed BTZ black holes. Our
findings indicate that this location is approximately at two and a half times
the radius of the horizon, where the correlation function reaches its
maximum.This supports the concept of a quantum atmosphere as the origin locus
of Hawking radiation,even in quantum-superposed spacetimes.
