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arXiv · 1002.2248

Phase Space Structure of Generalized Gaussian Cat States

Fernando Nicacio·Raphael N. P. Maia·Fabricio Toscano·Raul O. Vallejos
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Abstract

We analyze generalized Gaussian cat states obtained by superposing arbitrary Gaussian states, e.g., a coherent state and a squeezed state. The Wigner functions of such states exhibit the typical pair of Gaussian hills plus an interference term which presents a novel structure, as compared with the standard superposition of coherent states (degenerate case). We prove that, in any dimensions, the structure of the interference term is characterized by a particular quadratic form; in one degree of freedom the phase is hyperbolic. This phase-space structure survives the action of a thermal reservoir. We also discuss certain superpositions of {\em mixed} Gaussian states generated by conditional Gaussian operations or Kerr-type dynamics on thermal states.

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Fernando Nicacio, Raphael N. P. Maia, Fabricio Toscano, Raul O. Vallejos. 2010-02-11. Phase Space Structure of Generalized Gaussian Cat States. https://doi.org/10.1016/j.physleta.2010.08.076

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