  Identification over quantum broadcast channels is considered. As opposed to
the information transmission task, the decoder only identifies whether a
message of his choosing was sent or not. This relaxation allows for a
double-exponential code size. An achievable identification region is derived
for a quantum broadcast channel, and a full characterization for the class of
classical-quantum broadcast channels. The identification capacity region of the
single-mode pure-loss bosonic broadcast channel is obtained as a consequence.
Furthermore, the results are demonstrated for the quantum erasure broadcast
channel, where our region is suboptimal, but improves on the best previously
known bounds.
