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Acta Sinica Quantum Optica

The Entropy Squeezing Properties in a System of Single-mode FieldInteracting with Ξ Type Three-level Atom

HE Jin-yu

Published Jan 1, 2002• 0 citations
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Abstract

The field entropy squeezing properties in a system of vacuum of field interacting with Ξ type three-level atom are studied. The influence of the initial state of atoms and atom-field coupling constants on the field entropy squeezing is also discussed.

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The entropy squeezing properties of different types of moving three-level atoms coupled with a single-mode coherent field are studied. The influences of the moving velocity and initial states of the three-level atom on the entropy squeezing are discussed. The results show that, the entropy squeezing properties of the three-level atom depend on its initial state, moving velocity, and the type. A stationary three-level atom can not obtain a steady entropy squeezing whatever initial conditions are chosen, while a moving three-level atom can achieve a steady and optimal entropy squeezing through choosing higher velocity and appropriate initial state. Our result provides a simple method for preparing squeezing resources with ultra-low quantum noise of the three-level atomic system without additional any complex techniques.
The position- and momentum-entopic squeezing properties of the optical field in the system of a nearly degenerate three-level atom interacting with a single-mode field are investigated. Calculation results indicate that when the field is initially in the vacuum state, it may lead to squeezing of the position entropy or the momentum entropy of the field if the atom is prepared properly. The effects of initial atomic state and the splitting of the excited levels of the atom on field entropies are discussed in this case. When the initial field is in a coherent state, we find that position-entropy squeezing of the field is present even if the atom is prepared in the ground state. By comparing the variance squeezing and entropy squeezing of the field we confirm that entropy is more sensitive than variance in measuring quantum fluctuations.
By means of solving Schrdinger equation and numerical calculations,the dynamic behavior of the interaction between the single mode squeezed vacuum field and a moving Ξtype three-level atom has been studied,and the relations between the radiation squeezing effects and the coupling parameter of the system are discussed.The results of numerical calculations indicate that,the squeezed property of the radiation field is determined by the speed of the atom,and the squeezed property of the radiation field can be obviously influenced by the squeezing parameter of the system when the Ξ-type three-level atom moves with great speed.the radiation field can show complete squeezing effects when the system parameters are selected appropriately.
In this paper, we study the entropy properties of the field interacting with a Ξ type three-level atom, derive the calculating formula of the field(atomic)ent ropy, and discuss the influence of the initial atomic state and the one-photon d etuning on the field(atomic)entropy. With the help of Q function of the field(qu asiprobability distribution), the statistical properties of the field states are discussed. It is shown that the field is in the Schrodinger-Cat state at t=12TR when the atom is initially in the middle-level.