Squeezed states in N-atom time-dependent resonance fluorescence

Abstract

The dependence of squeezing on the number of atoms is discussed in the time-dependent collective resonance fluorescence of N two-level atoms, coherently driven by a strong resonant laser field. It is shown that, for strong driving field, squeezing appears only in the transient regime of resonance fluorescence. The location of squeezing in time is independent of the number of atoms and the initial atomic populations. It is found that despite the reduction in the amount of squeezing per single atom, squeezing increases in the whole resonance fluorescence field as the number of atoms increases, and attains its maximal value for moderate N. Moreover, the maximal value of squeezing is dependent on the intensity of the driving field. As the latter increases, the maximum of squeezing increases and shifts towards larger numbers of atoms. For a very large number of atoms, however, squeezing is altogether removed Dependance de la compression des fluctuations du champ en fonction du nombre d'atomes dans le cas de la fluorescence de resonance collective dependant du temps, lorsque N-atomes a deux niveaux sont soumis de maniere coherente a un champ laser resonnant et intense