Polariton superfluid is predicted to be a state of the exciton-polaritons system that combines the characteristics of lasers with those of excellent electrical conductors.
[3] Wave behavior in this state results in a light beam similar to that from a laser but possibly more energy efficient.
In particular, important properties of superfluids, such as zero viscosity, and of lasers, such as perfect optical coherence, are a matter of debate.
[8][9] Although, there is clear indication of quantized vortices when the pump beam has orbital angular momentum.
[10] Furthermore, clear evidence has been demonstrated also for superfluid motion of polaritons, in terms of the Landau criterion and the suppression of scattering from defects when the flow velocity is slower than the speed of sound in the fluid.