title: Quantum superposition state production by continuous observations and feedback.
abstract: We present a protocol for the generation of superpositions of states with distinguishable field amplitudes in an optical cavity by quantum nondemolition photon number measurements and coherent feeding of the cavity.
authors.affiliation: Lundbeck Foundation Theoretical Center for Quantum System Research, Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark. negretti@phys.au.dk
authors.forename: Antonio
authors.initials: A
authors.lastname: Negretti
authors.forename: Uffe V
authors.initials: UV
authors.lastname: Poulsen
authors.forename: Klaus
authors.initials: K
authors.lastname: Mølmer