Browsing by Author "ROA, L"

Now showing 1 - 5 of 5
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    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.
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    GENERATION OF HIGHLY SQUEEZED STATES IN A 2-PHOTON MICROMASER
    (1992) ORSZAG, M; RAMIREZ, R; RETAMAL, JC; ROA, L
    We consider a lossless two-photon micromaser with atomic polarization. We find that for particular values of the atomic flight time, the field evolves to a pure state which can be made of a superposition of even-photon-number states or odd-number states. These states approach to a perfectly squeezed state as the upper limit of the "trap" increases.
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    GENERATION OF PURE STATES IN A 2-PHOTON MICROMASER - EFFECTS OF FINITE DETUNING AND CAVITY LOSSES
    (1993) ORSZAG, M; ROA, L; RAMIREZ, R
    In this paper, we study the generation of pure states in a two-photon micromaser with finite detuning of the intermediate atomic level. This study was done via the temporal evolution of the discrete master equation. We show that it is possible to generate the ideal squeezed vacuum for a broad range of detunings in a lossless cavity and away from the trapping condition. We also-consider the effect of cavity losses.
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    SQUEEZING AND BIFURCATION IN THE PHASE PROBABILITY-DISTRIBUTION IN A 2-PHOTON MICROMASER
    (1991) ORSZAG, M; ROA, L; RAMIREZ, R
    We derive a master equation for the two-photon micromaser with atomic coherence. We find that the presence of the atomic coherence modifies the threshold condition in the two-photon micromaser, and also produces squeezing and bifurcation in the phase probability distribution. The maximum squeezing is of 36% and it happens below threshold.
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    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.