  The notion of broadcasting is extended to include the case where an arbitrary
input density state of a two-mode radiation field gives rise to an output state
with identical marginal states for the respective modes, albeit different from
the input state. The initial unknown input density state is unitarily related
to the output state but is not equal to the two identical output marginal
states. This extended notion of broadcasting suggests a possible way of
discriminating between two noncommuting quantum states.
