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Physical Review A

Generation of sub-Poissonian and squeezed fields in the thermal superposition Jaynes-Cummings model

M. Kozierowski, Juan F. Poyatos, Luis Lorenzo Sánchez-Soto

Published Mar 1, 1995• 10 citations
Publisher

Abstract

Approximate analytical expressions for the time evolution of the photon-number statistics and squeezing in the thermal Jaynes-Cummings model with a two-level atom being initially in a coherent superposition of its ground and excited states are presented.
DOI
10.1103/physreva.51.2450

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The behavior of the mean photon number, photon number variance and field squeezing is investigated for the two two-level atoms prepared in a multiatom squeezed state coupled to the vacuum or thermal field. The value of superposition angle (θ) of the atomic states is found to affect the photon number variance as well as field squeezing. The bound on the sun-Poissonian field concerning the value of θ and input mean photon number is determined. One of the field quadrature is found to exhibit permanent squeezing for the vacuum input in a small range of the value of θ. It is shown that the input thermal photons degrade the sub-Poissonian character and spontaneous squeezing. However, a considerable amount of squeezing is obtained even in the presence of thermal photons.