The relation between the entanglement of two atoms and the entanglement of two-mode fields
Heng-Na Xiong, Guo Hong, Jiang Jian, Chen Jun, Tang Li-Yan, (1)华中师范大学物理科学与技术学院,武汉 430079; (2)华中师范大学物理科学与技术学院,武汉 430079;中国科学院武汉物理与数学研究所,波谱与原子分子物理国家重点实验室,武汉 430071;中国科学院冷原子物理中心,武汉 430071 · Acta Physica Sinica · 2006
By means of negativity and concurrence, we investigate the time evolution of the entanglement of the two atoms and the entanglement between the two modes in the system of two atoms interacting with two-mode fields. We find the two entanglements can swap with each other, and they have a very good coincidence relation under certain conditions. In two -qubit system, negativity and concurrence in the same range can keep identical with each other on the standard of the existence of entanglement, but they may not always keep pace with each other for mixed states of the system.