Abstract
We propose a scheme for measuring the Wigner function of a two-mode cavityfield. The scheme bases on the interaction between the two-mode cavity fieldand three-level atoms. We find a simple relation between the Wigner functionand the atomic population. One can obtain the Wigner function by measuringthe atomic population with a micromaser-like experiment and doing anumerical integral. By using the two-mode Wigner function one can obtain theClauser–Horne combination and test the Bell's inequalities. We test ourequations with a two-mode entanglement state and the results are rather good.
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