naa a22 4500 510767109 CHVBK 20180411083200.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s12043-013-0527-2 doi (NATIONALLICENCE)springer-10.1007/s12043-013-0527-2 Collapse revival behaviour of the entanglement between V-type three-level atoms and two-mode photons in nonlinear Jaynes-Cummings model [Elektronische Daten] [M MAHJOEI, M GOLSHAN, H SAFARIf] In this paper the time evolution of von Neumann entropy, as a measure of entanglement between V-type three-level atoms and the union of a two-mode field, is studied. The atom-field interaction is assumed to occur in a Kerr-type medium with an intensity-dependent coupling. Introducing a Casmir operator whose eigenvalues, N, give total excitations in the system and commutes with the governing Hamiltonian, it is concluded that the latter is block-diagonal with ever growing dimensions. As we shall show, however, each block consists of two 2 × 2 blocks while all the others, (N −1) in number, are 3 × 3. We then proceed to analytically calculate the time-evolution operator which is also block-diagonal, each block with the same properties as that of the Hamiltonian. Our calculations show that, as expected, the atom-field entanglement oscillates which, depending upon the initial state, exhibits the phenomenon of collapse revivals. It is further shown that collapse revivals occur whenever both 2 × 2 blocks are involved in the time evolution of the system. Properties of such behaviour in the entanglement are also discussed in detail. Indian Academy of Sciences, 2013 Atom-photon entanglement nationallicence nonlinear medium nationallicence von Neumann entropy nationallicence three-level atom nationallicence two-mode field nationallicence MAHJOEI M. Physics Department, Vali-Asr University, Rafsanjan, Iran aut GOLSHAN M. Physics Department, Shiraz University, Pardis Eram, Shiraz, Iran aut SAFARIf H. Photonic Department, Kerman Graduate University of Technology, Mahan, Kerman, Iran aut Pramana Springer-Verlag 80/5(2013-05-01), 785-796 0304-4289 80:5<785 2013 80 12043 https://doi.org/10.1007/s12043-013-0527-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12043-013-0527-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- MAHJOEI M. Physics Department, Vali-Asr University, Rafsanjan, Iran aut NATIONALLICENCE 700 1- GOLSHAN M. Physics Department, Shiraz University, Pardis Eram, Shiraz, Iran aut NATIONALLICENCE 700 1- SAFARIf H. Photonic Department, Kerman Graduate University of Technology, Mahan, Kerman, Iran aut NATIONALLICENCE 773 0- Pramana Springer-Verlag 80/5(2013-05-01), 785-796 0304-4289 80:5<785 2013 80 12043 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer