Distribution of squeezed spin quantum noise in an antiferromagnet

We study the magnon-squeezed states generated by second-Raman scattering. The magnon-squeezed states allow a reduction in the spin-component fluctuation to below the level of the vacuum fluctuation. As the laser fields change the symmetry of the spin system, this leads to the anisotropy of the spin-fluctuation distribution. We evaluate the fluctuation of the spin component and discuss the anomalies of the spin-fluctuation distribution. [Copyright &y& Elsevier]