Generation of a coherent state of the micromaser field

M. H. Naderi, M. Soltanolkotabi, R. Roknizadeh

Georg A. Raithel, Oliver J. Benson, HERBERT WALTHER

M. H. Naderi, M. Soltanolkotabi, R. Roknizadeh

In this paper the possibility of generating nonlinear coherent states of the radiation field in a micromaser is explored. It is shown that these states can be provided in a lossless micromaser cavity under the weak Jaynes-Cummings interaction with intensity-dependent coupling of large number of individually injected two-level atoms in a coherent superposition of the upper and lower states. In particular, we show that the so-called nonlinear squeezed vacuum and nonlinear squeezed first excited states, as well as the even and odd nonlinear coherent states can be generated in the presence of two-photon transitions.

Günter Manzke, W. Vogel, D.‐G. Welsch

A. F. Gomes, José Antonio Roversi, A. Vidiella-Barranco

We propose a two-photon micromaser-based scheme for the generation of a non-classical state from a mixed state. We conclude that a faster, as well as a higher degree of field purity, is achieved in comparison to one-photon processes. We investigate the statistical properties of the resulting field states, for initial thermal and (phase-diffused) coherent states. Quasiprobabilities are employed to characterize the state of the generated fields

Federico Casagrande, Alessandro Ferraro, ALFREDO LULLI +3 more

We discuss a scheme to relate the phase diffusion dynamics of the micromaser field to the measured atomic population statistics. This can allow us to measure the linewidth of the micromaser spectrum and to solve a relevant decoherence problem in cavity quantum electrodynamics. The main steps are (i) a suitable preparation of the cavity field state to generate coherences, (ii) the transfer of information on the dynamics of field coherences to probe atoms by the action of an external resonant coherent field and (iii) the derivation of the phase diffusion rate, hence the micromaser linewidth, from the measured population statistics of the probe atoms. The method can be applied even in the presence of trapping states, where peculiar linewidth oscillations are expected for increasing pump rate, due to the quantum nature of the micromaser field.