Atom--photon entanglement in the system with competing k-photon and l-photon transitions
Wu Qin(吴琴)a)†, Fang Mao-Fa(方卯发)b), and Hu Yao-Hua(胡要花)b)
a School of Basic Medical Science, Guangdong Medical College, Dongguan 523808, China; b College of Physics and Information Science, Hunan Normal University, Changsha 410081, China
Abstract We have investigated the evolution of the atomic quantum entropy and the entanglement of atom--photon in the system with competing k-photon and l-photon transitions by means of fully quantum theory, and examined the effects of competing photon numbers (k and l), the relative coupling strength between the atom and the two-mode field ($\lambda/g$), and the initial photon number of the field on the atomic quantum entropy and the entanglement of atom--photon. The results show that the multiphoton competing transitions or the large relative coupling strength can lead to the strong entanglement between atoms and photons. The maximal atom--photon entanglement can be prepared via the appropriate selection of system parameters and interaction time.
Received: 18 December 2006
Revised: 12 January 2007
Accepted manuscript online:
PACS:
42.50.Hz
(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10374025).
Cite this article:
Wu Qin(吴琴), Fang Mao-Fa(方卯发), and Hu Yao-Hua(胡要花) Atom--photon entanglement in the system with competing k-photon and l-photon transitions 2007 Chinese Physics 16 1971
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