  We present results from Langevin dynamics simulations of a glassy
active-passive mixture of soft-repulsive binary colloidal disks. Activity on
the smaller particles is applied according to the quorum sensing scheme, in
which a smaller particle will be active for a persistence time if its local
nearest neighbors are equal to or greater than a certain threshold value. We
start with a passive glassy state of the system and apply activity to the
smaller particles, which shows a nonmonotonous glassy character of the active
particles with the persistence time of the active force, from its passive limit
(zero activity). On the other hand, passive particles of the active-passive
mixture phase separate at the intermediate persistence time of the active
force, resulting in the hexatic-liquid and solid-liquid phases. Thus, our
system shows three regimes as active glass, phase separation, and active
liquid, as the persistence time increases from its smaller values. We show that
the solidlike and hexatic phases consisting of passive large particles are
stable due to the smaller momentum transfer from active to passive particles,
compared to the higher persistence time where the positional and orientational
ordering vanishes. Our model is relevant to active biological systems, where
glassy dynamics is present, e.g., bacterial cytoplasm, biological tissues,
dense quorum sensing bacteria, and synthetic smart amorphous glasses.
