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Tunable Entanglement Sudden Death and Birth in Cavity QED with Nonlinear Kerr-Like Medium

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He Q., Xu J.

Acta Physica Polonica A

2011

vol. 120

issue 3

390-396

The influence of nonlinear Kerr-like medium on the phenomenon of entanglement sudden death and birth in a double Jaynes-Cummings model is investigated. It is shown that the entanglement sudden death and birth phenomenon may appear in this system and the duration of entanglement sudden death and birth can be controlled by the nonlinear Kerr-like medium. Particularly, the phenomenon of entanglement sudden death and birth disappears one after another if we increase the value of the Kerr coefficient χ continuously, and all disappears if the value of the Kerr coefficient χ is large enough.

Elastic Constants for Various Classes of Solids at High Temperature

100%

Liu Q., He Q.

Acta Physica Polonica A

2007

vol. 112

issue 1

69-76

In the present communication, a new relationship for the temperature dependences of elastic constants are developed using a new expression for the temperature dependence of bulk modulus and the formulation derived from Tallon's model. The proposed relationship is applied to study elastic constants of NaCl, KCl, CaF_2, MgO, CaO, and Mg_2SiO_4. The result obtained for second-order elastic constants are found to compare well with the experimental data.

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2 Acta Physica Polonica A

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1 2007

2 He Q.

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Tunable Entanglement Sudden Death and Birth in Cavity QED with Nonlinear Kerr-Like Medium

Elastic Constants for Various Classes of Solids at High Temperature