  Suprecontinuum (SC) light contains complex spectral noise structure and its
accurate characterization is important for fundamental understanding of its
physics as well as for its applications. Several experimental and theoretical
noise characterizations have been performed so far. However, none of them takes
into account the quantum mechanical properties. Here, we demonstrate
experimental characterisation of quantum noise and its spectral correlations
formed in the SC light generated from a photonic crystal fiber. Moreover, by
applying an appropriate basis transformation to these correlations, we
demonstrate that the SC noise amplitude can be squeezed below the shot-noise
limit in some bases, even in the presence of excessively large nonlinearities.
