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We study the properties of a monitored ensemble of atoms driven by a laserfield and in the presence of collective decay. By varying the strength of theexternal drive, the atomic cloud undergoes a measurement-induced phasetransition separating two phases with entanglement entropy scalingsub-extensively with the system size. The critical point coincides with thetransition to a superradiant spontaneous emission. Our setup is implementablein current light-matter interaction devices, and most notably, the monitoreddynamics is free from the post-selection measurement problem, even in the caseof imperfect monitoring.

Post-selection-free Measurement-Induced Phase Transition in Driven Atomic Gases with Collective Decay