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Optics and Spectroscopy

Micromaser action in atomic clusters

В. Н. Горбачев, Andrew I. Trubilko

Published May 1, 2003• 0 citations
Publisher

Abstract

Optical micromaser action is considered in atomic clusters that can be involved in separable and entangled initial correlations. An equation describing the evolution of the Glauber quasi-probability for a light field is constructed in the Fokker-Planck approximation. The statistics of radiation emitted by a cavity is analyzed.
DOI
10.1134/1.1576847

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Stimulated emission of two-level atoms in a high-Q cavity is considered under conditions when pumping produces correlated many-atomic states. Based on the many-body problem, a kinetic equation is obtained for the Glauber–Sudarshan probability, which describes the field in the Fokker–Planck approximation. The statistics of light in this approximation are determined by the atomic correlation functions of the order of no higher than the second. The noise of light is found in the regime of micromaser operation for two types of pumping producing the initial separable states with a classical correlation and entangled states. It is shown that the presence of the initial diatomic correlation enhances the intensity noise. The entangled state of atoms is found from which nonclassical light is generated with a steady-state phase and noise, which can be almost completely suppressed in the low-frequency spectral region.
Two-mode generation of light in a system of N identical relaxation-free atoms placed in a resonator is considered on the basis of the derived controlling Fokker-Planck equation for the Glauber-Sudarshan quasiprobability. Under steady-state conditions, a state of modes is formed with nonclassical correlation characterized by sub-Poison statistics of photons and leading to complete suppression of shot noise. Being an entangled pair, these sub-Poisson modes can be used as a quantum channel for teletransmission of light. In contrast to the standard Einstein-Podolskly-Rosen (EPR) channel, the recipient can reproduce only correlation functions of the intensity of an unknown state.
We present a theory which can explain the micromaser as well as its optical counterpart, the microlaser, for appropriate values of dissipative parameters. We show that, in both the the cases, the cavity radiation fields can have sub-Poissonian photon statistics. We further analyse if it is possible to attain a Fock state of the radiation field. The microlaser is precluded for such analysics due to the damping of its lasing levels making transitions at optical frequencies. Hence, we focus our attention on the micromaser and our exact simulation of the dynamics shows that it is not possible to generate a Fock state of the cavity radiation field.