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T. Felbinger, S. Schiller, and J. Mlynek
Oscillation and Generation of nonclassical states in three-photon down conversion
Phys. Rev. Lett. 80 (1998) 492


    The process of 3-photon down conversion 3 + + in an optical cavity is analyzed theoretically. A classical feature of this system is a first-order transition of the fundamental mode above a threshold 3 pump power. We calculate the quantum properties of the steady state both using quantum trajectory simulations, and by perturbation expansion of the density operator. A nongaussian Wigner function exhibiting a threefold symmetry is found. Above threshold the Wigner function displays separate peaks among which tunneling occurs.

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