Observation of Macroscopic Quantum Fluctuations in Stimulated Raman Scattering

Abstract
Large-scale quantum fluctuations have been observed in the energy of light pulses produced by transient stimulated Raman scattering of laser pulses in hydrogen gas. This experiment verifies recent theoretical work on quantum initiation of light scattering, and provides an example of a macroscopic system which begins in a pure state and, through essentially pure-state quantum evolution, ends up having highly unpredictable values of its physical observables.