Browsing by Author "SAAVEDRA, C"

Now showing 1 - 4 of 4
  • Thumbnail Image
    Item
    DIFFUSION-PROCESSES ASSOCIATED TO A LASER MODEL
    (AMER INST PHYSICS, 1992) REBOLLEDO, R; RETAMAL, JC; SAAVEDRA, C
    A diffusion process is constructed as a model for the electromagnetic field in a laser. The process is characterized by means of a Martingale problem of Nelson's type, under a finite entropy assumption.
  • No Thumbnail Available
    Item
    EFFECT OF FINITE ATOMIC LIFETIMES ON THE GENERATION OF NONCLASSICAL STATES IN MICROMASERS
    (1993) ROA, L; RETAMAL, JC; SAAVEDRA, C
    We study the effect of finite atomic lifetimes on a micromaser from temporal evolution. A stream of finite-lifetime two-level atoms is injected inside a cavity in a coherent superposition of their upper and lower levels. We study the effect of the atomic decay on the generation of quasipure states of the inner electromagnetic field. First, we study the stationary photon number distribution when the atoms are injected in their upper level. We compare our results with previous calculations by Zhu, Wang, and Fearn [Phys. Rev. A 44, 737 (1991)]. We find that quasinumber states can be generated for a long time, in a range of physical parameters that allows their experimental realization. Second, we investigate the effect of finite atomic lifetimes on the generation of cotangent states, and we study their squeezing properties.
  • Thumbnail Image
    Item
    QUANTUM FLOWS ASSOCIATED TO MASTER-EQUATIONS IN QUANTUM OPTICS
    (AMER INST PHYSICS, 1994) FAGNOLA, F; REBOLLEDO, R; SAAVEDRA, C
    A stochastic dilation of master equation for a maser is constructed using the technique of quantum stochastic differential equations with unbounded operator coefficients. The associated quantum Markov flow is characterized and turns out to extend a classical birth and death process. Furthermore, the stationary distribution of the aforementioned process, which is connected to the stationary state of the micromaser, is obtained in a closed form.
  • No Thumbnail Available
    Item
    TRAPPING STATES IN A 3-LEVEL LAMBDA-SYSTEM
    (1992) RETAMAL, JC; ROA, L; SAAVEDRA, C
    We study the temporal evolution and the stationary regime of an electromagnetic-field mode interacting with three-level LAMBDA-type atoms in a lossless microwave cavity. We find that under certain conditions the field evolves to the recently defined tangent or cotangent states [J. J. Slosser and P. Meystre, Phys. Rev. A 41, 3867 (1990)]. In particular, in this system number states can be generated for any value of the atomic-upper-level population. In addition, a strong squeezing in the quadrature fluctuations is found.