Using the Born-Oppenheimer approximation, we derive an effective Hamiltonian for an optomechanical system that leads to a nonlinear Kerr effect in the system's vacuum. The oscillating mirror at one edge of the optomechanical system induces a squeezing effect in the intensity spectrum of the cavity field. A near-resonant laser field is applied at the other edge to drive the cavity field, in order to enhance the Kerr effect. We also propose a quantum-nondemolition-measurement setup to monitor a system with two cavities separated by a common oscillating mirror, based on our effective Hamiltonian approach.
@article{arxiv.0805.4102,
title = {Effective Hamiltonian approach to the Kerr nonlinearity in an optomechanical system},
author = {Z. R. Gong and H. Ian and Yu-xi Liu and C. P. Sun and Franco Nori},
journal= {arXiv preprint arXiv:0805.4102},
year = {2010}
}