Quantum superpositions and Schrodinger cat states in quantum optics

We describe the properties of a quantum system prepared in superpositions of classically distinguishable states, These states, often called Schrodinger cat states, are of great interest at present. We discuss how they may be realized in quantum optics using nonlinear Interactions and cavity quantum electrodynamics. We first describe the quantum properties of field states in a cavity, and demonstrate the interference properties which characterize superposition states and discuss how fragile they are in dissipative environments, Finally, we review current experimental approaches which may realize these states. (C) 1997 American Association of Physics Teachers.