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Chinese Journal of Quantum Electronics

Controlling dipole squeezing of entangled atoms via superposition coherent state field

Zhihua Liu

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

Considering two two-level atoms (A and B) initially in the EPR state,atom B is put into one cavity prepared in coherent superposition state.When atom B flies out of the cavity,an arbitrary state measurement is carried out on it.The law about the effects on the dipole of atoms A exerted by light field intensity and superposition coefficients is obtained,and the result also shows that the dipole squeezing of atoms A can be achieved under certain conditions.

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Considering two two-level atoms (A and B) initially in the EPR state,atom B is put into one cavity prepared in coherent superposition state.When atom B flies out of the cavity,an arbitrary state measurement is carried out on it.The law about the effects on the dipole of atoms A exerted by light field intensity and superposition coefficients is obtained,and the result also shows that the dipole squeezing of atoms A can be achieved under certain conditions.
Considering two Λ-type three-level atoms initially in the entangled state,one atom is poured into the cavity and interacts with a two-mode cavity.The dipole squeezing of an atom inside the cavity are investigated.The influences of the selective atomic measurement and the intensity of the coherent field which interacts with atom on dipole squeezing of an atom inside the cavity are discussed.The result obtained by numerical calculations shows that the dipole squeezing of an atom inside the cavity can be strengthened through selective atomic measurement for atom outside of the cavity.
The atomic dipole squeezing effect in the system of two identical two-level atoms in the Bell state interacting with the two-mode entangled coherent state field in Kerr medium are investigated by means of solving the Schrdinger equation and numerical calculations. The effects on the atomic dipole squeezing effect produced by the atomic initial state, mean photon number of light field, the degree of the entanglement of the entangled coherent field, the coupling strength of the Kerr medium with the light field and the coupling strength of dipole-dipole interaction between atoms are discussed. The results show that the dipole squeezing effect does not appear for the Bell state |β11>, while there can be dipole squeezing effect under certain conditions for the Bell states |β00> or |β01> or |β10>. In the latter case, the dipole squeezing effect depends on the coupling strength of the Kerr medium with the light field, the mean photon number and the degree of entanglement of the two-mode entangled coherent field.