NOISE OF QUANTUM SOLITONS AND THEIR QUASI-COHERENT STATES

Quantum noise of optical solitons is analysed based on the exact solut ions of the quantum nonlinear Schrodinger equation (QNSE) and the cons truction of the quantum soliton states. The noise limits are obtained for the local photon number and for the local quadrature phase amplitu de. They are larger than the vacuum fluctuation. So in the fundamental soliton states the variance of the local photon number and the local quadrature phase amplitude cannot be squeezed. The soliton states with the minimum noise are quasi-coherent states, in which the quantum dis persion effects are negligible.