Can a single light measurement force matter into a quantum superposition?

Shining intense 'squeezed vacuum' light on an ensemble of atoms and then measuring the outgoing light with a single detector forces the atoms into a macroscopic quantum superposition — a cat-like state involving the collective behavior of the whole ensemble. Without that measurement, the atoms just end up in a boring classical mixture. Brighter squeezed light speeds the process up, suggesting a path to engineering exotic quantum states in bulk matter on ultrafast timescales.