  The dissipative variant of the Ising model in a transverse field is one of
the most important models in the analysis of open quantum many-body systems,
due to its paradigmatic character for understanding driven-dissipative quantum
phase transitions, as well as its relevance in modelling diverse experimental
platforms in atomic physics and quantum simulation. Here, we present an exact
solution for the steady state of the transverse-field Ising model in the limit
of infinite-range interactions, with local dissipation and inhomogeneous
transverse fields. Our solution holds despite the lack of any collective spin
symmetry or even permutation symmetry. It allows us to investigate first- and
second-order dissipative phase transitions, driven-dissipative criticality, and
captures the emergence of a surprising "spin blockade" phenomenon. The ability
of the solution to describe spatially-varying local fields provides a new tool
to study disordered open quantum systems in regimes that would be extremely
difficult to treat with numerical methods.
