  Understanding the mechanism through which an open quantum system exchanges
information with an environment is central to the creation and stabilization of
quantum states. This theme has been explored recently, with attention mostly
focused on system control or environment engineering. Here, we bring these
ideas together to describe the many-body dynamics of an extended atomic array
coupled to a squeezed vacuum. We show that fluctuations can drive the array
into a pure dark state decoupled from the environment. The dark state is
obtained for an even number of atoms and consists of maximally entangled atomic
pairs, or dimers, that mimic the behavior of the squeezed field. Each pair
displays reduced fluctuations in one polarization quadrature and amplified in
another. This dissipation-induced stabilization relies on an efficient transfer
of correlations between pairs of photons and atoms. It uncovers the mechanism
through which squeezed light causes an atomic array to self-organize and
illustrates the increasing importance of spatial correlations in modern quantum
technologies where many-body effects play a central role.
