Resonant Interaction of Tow-Level Atoms with Two Light Waves

智 藤井, 敏雄 伊東

Zheng Nai-qing

Anti-bunching effect of the light field in the system of a two-mode field initially in an SU(2) coherent state resonantly interacting with a three-level V-type atom are investigated by numerical calculations.The influences of the selective atomic measurement,the total photon of the tow-mode,the partition parameter,the coupling constant and the atomic initial state on the anti-bunching effect of the light field is discussed.The results indicate: the a mode anti-bunching effect is distinctly enhanced when the state-selective measurement is performed on the atom or the atom is initially on the lower level;the anti-bunching effect of the field does not change over time when the tow coupling constants are same and the direct state-selective measurement is performed on the atom;the anti-bunching effect of the two mode of the field is distinctly enhanced when the total photon number of the two-mode is decreased.

P. van der Straten, Harold J. Metcalf

Zheng Nai-qing

Difference squeezing properties of the field in the system of a two-mode field initially in an SU (2) coherent state resonantly interacting with a three-level V-type atom are investigated by means of the quantum theory and numerical calculations. The dependence of the difference squeezing of two-mode on the total photon of the tow-mode, the partition parameter, the coupling constant and the atomic initial state is discussed for three cases: (1) no state-selective atomic measurement; (2) direct state-selective atomic measurement; (3) state-selective atomic measurement after the application of a classical field. The results indicate that when the atom is initially on the lower level or the total photon number of the two-mode is increased, the average intensity of the difference squeezing is distinctly enhanced; when the partition parameter is decreased, the average intensity of the difference squeezing is distinctly deadened; when the tow coupling constants are same and the state-selective measurement is performed on the atom, the average intensity of the difference squeezing does not change over time.

Zheng Nai-qin

Anti-bunching effect of the field in the system of a two-mode field initially in an SU(2) coherent state resonantly interacting with a three-level Λ-type atom are investigated by means of quantum theory and nu-merical calculations.The dependence of the anti-bunching effect on the total photon of the tow-mode,the parti-tion parameter,the coupling constant and the atomic initial state is discussed for two cases:(1) no state-selective atomic measurement;(2) direct state-selective atomic measurement.The results indicate: the anti-bunching effect of the two mode of the field exhibits when the two coupling coefficients are the same;a mode anti-bunching ef-fect is distinctly enhanced when the atom is initially on the lower level or direct state-selective measurement is performed on the atom;the anti-bunching effect of the two mode of the field is distinctly enhanced when the to-tal photon number of the two-mode is decreased;the anti-bunching effect of the field does not change over time when the two coupling coefficients are the same and the state-selective measurement is performed on the atom.

С. С. Фанченко