Generation of squeezed Schr\"odinger cat states with an operation   allowing iterative growth
  We present what is to our knowledge the first implementation of a Schr\"odinger cat states "breeding" operation, which allows an iterative growth of these states. We thus report the experimental generation of a squeezed Schr\"odinger cat state from two single photon Fock states, which can be seen as cat states with zero amplitude. These Fock states are mixed on a symmetrical beamsplitter and the generation is heralded by a homodyne measurement in one of the two output arms. The output state has a fidelity of 61% with an even squeezed Schr\"odinger cat state of amplitude $\alpha=1.63$. This hybrid operation opens up new prospects in quantum optics as the protocol depicted here can be iterated in order to produce new kind of mesoscopic states. 
Jean Etesse, Martin Bouillard, Bhaskar Kanseri and Rosa Tualle-Brouri
quant-ph