Broad-Band Parametric Deamplification of Quantum Noise in an Optical Fiber

Abstract

Broad-band squeezed states of light are generated by forward nondegenerate four-wave mixing in a single-mode optical fiber cooled below 4.2 K. The minimum total noise level was (12.5 \ifmmode\pm\else\textpm\fi{} 0.5)% below the standard quantum limit.