Squeezing and entanglement of a two-mode field in a four-level tripod atomic system |
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Authors: | J.L. Ding |
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Affiliation: | a School of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610068, Chinab Visual Computing and Virtual Reality Key Laboratory of Sichuan Province, Chengdu 610068, China |
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Abstract: | The interaction of a collection of N four-level tripod configuration atoms with two orthogonally polarized probe fields is investigated. Under the condition of electromagnetically induced transparency (EIT), we calculate the squeezing and entanglement spectra of the output probe fields. By analyzing the output spectrum, we find that the squeezing and entanglement of the probe fields can be well-preserved after passing through the optically thick medium. Additionally, the effects of the ground state dephasing rates of the atoms on the entanglement and squeezing of the output two-mode squeezed fields are investigated. It is shown that the dephasing rates will degrade the entanglement and squeezing, and these quantum properties can be lost when the dephasing rates increase up to a certain value. This will be useful in the quantum computation and quantum communication. |
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Keywords: | Squeezing Entanglement Electromagnetically induced transparency |
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