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Several mechanisms are discussed which could determine the spatial coherence of a polariton condensate confined to a one dimensional wire. The mechanisms considered are polariton–polariton interactions, disorder scattering and non‐equilibrium occupation of finite momentum modes. For each case, the shape of the resulting spatial coherence function  g  (1) ( x ) is analysed. The results are compared with the experimental data on a polariton condensate in an acoustic lattice from E. A. Cerda‐Mendez et al. [Phys. Rev. Lett.  105 , 116402 (2010)]. It is concluded that the shape of  g  (1) ( x ) can only be explained by non‐equilibrium effects, and that ∼10 modes are occupied in the experimental system.

Spatial coherence of a polariton condensate in 1D acoustic lattice