  We utilize the Hubbard model to demonstrate that doping of the
antiferromagnetic parent compounds of cuprate superconductors stabilizes a spin
liquid state. Superconductivity in such a state emerges due to the spin-orbit
coupling between charge current and superfluidity of spinon condensate,
resulting in a chiral relation between the order parameter phase gradient and
supercurrent. We propose simple experimental tests for the presented mechanism.
