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Fuzhou daxue xuebao. Ziran kexue ban

Entropic squeezing properties of the field in the system of the cascade three-level atom interacting with superposition states field

LU Dao-ming

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

The entropic squeezing properties of the field in the system of the cascade three-level atom interacting with superposition states field are studied.When the field is superposition state of |0〉 and |1〉,the results obtained using the numerical method indicate that the entropic squeezing properties of the field is closely related to the superposition coefficient φ and is influenced by the superposition coefficient.When φ is larger than 0 and smaller than π/2,with the increasing of the value of φ,the entropic squeezing properties of the field is getting stronger.

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The entropic squeezing properties of the field in the system of the cascade three-level atom interacting with superposition states field are studied.When the field is superposition state of |0〉 and |1〉,the results obtained using the numerical method indicate that the entropic squeezing properties of the field is closely related to the superposition coefficient φ and is influenced by the superposition coefficient.When φ is larger than 0 and smaller than π/2,with the increasing of the value of φ,the entropic squeezing properties of the field is getting stronger.
The entropy squeezing for a three-level atom interacting with a single-model field is studied. A general definition of entropy squeezing for three-level atom is given according to entropic uncertainty relation of three-level system, and the calculation formalism of entropy is derived for a cascade three-level atom. By using numerical calculation, the entropy squeezing properties of a cascade three-level atom are examined. Our results show that, three-level atom can generate obvious entropy squeezing effect via choosing appropriate superposition state of three-level atom. Our results are meaningful for preparing three-level system information resources with ultra-low quantum noise.
The entropy evolution of the field in the system of the cascade three-level atom interacting with coherent state field is studied.The results obtained using the numerical method indicate that the field entropy is influenced by the field parameters ｜α｜,a) when ｜α｜ is small,with the increasing of the value of ｜α｜,the average value of the field entropy is increasing and the related degree of the field-atom is getting stronger;b) when ｜α｜ is larger than certain value,with the increasing of the value of ｜α｜,the average value of the field entropy is decreasing,and the related degree of the field-atom is getting weaker.
Antibunching effect and squeezing property of the binomial state field interact- ing with a cascade three-level atom are studied by using quantum theory and calculation method,and the influences of initial field parameters on the quantum properties of the field are discussed.The results are that,firstly,when the field is initially in a coherent state,its antibunching effect can be displayed discontinuously and squeezing effect can be exhibited in a short time;Secondly,when the initial field is in a middle state between the coherent state and number state,the field shows antibunching effect continuously and the deep degree and sustained time of its squeezing effect increase;Finally,while when the initial field transmits to a fock state,the field reveals continuously antibunching effect but its squeezing effect weak- ens to disappear.Our results show that binomial state field displays remarkable no-classical properties when it interacts with a cascade three-level atom.
Entropy squeezing effect of the binomial state field interacting with a cascade three-level at- om are studied by using quantum entropy theory effect and calculation method,and the influences of initial field parameters on the entropy squeezing effect of the field are discussed.The results are that, firstly,when the field is initially in a coherent state,entropy squeezing effect can be exhibited in a short time;secondly,when the initial field is in a middle state between the coherent state and number state,the depth and sustained time of the field's squeezing effect increase;finally,when the initial field transmit to a lock state,the field's squeezing effect weakens and disappears in the end.The re- sults show that binomial state field displays obviously entropy squeezing effect when it interacts with a cascade three-level atom.