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Image: Gangqiang Liu and David Snoke, University of Pittsburgh
Interference pattern showing the phase coherence of a polariton superfluid circulating in a ring. The polaritons are produced when photons in a specially designed optical medium are altered to have mass and repulsive interactions, so that they act like a gas of atoms. From Liu et al., Proc. Nat. Acad. Sci. (USA), (2015).