  Large density fluctuations observed in active systems and hyperuniformity are
two seemingly incompatible phenomena. However, the formation of hyperuniform
states has been recently predicted in non-equilibrium fluids formed by chiral
particles performing circular motion with the same handedness. Here we report
evidence of hyperuniformity realized in a chiral active fluid comprised of
pear-shaped Quincke rollers of arbitrary handedness. We show that
hyperuniformity and large density fluctuations, triggered by dynamic
clustering, coexist in this system at different length scales. The system loses
its hyperuniformity as the curvature of particles' motion increases
transforming them into localized spinners. Our results experimentally
demonstrate a novel hyperuniform active fluid and provide new insights into an
interplay between chirality, activity and hyperuniformity.
