https://doi.org/10.1140/epjd/e2014-50145-0
Regular Article
Geometric quantum discord and entanglement between two atoms in Tavis-Cummings model with dipole-dipole interaction under intrinsic decoherence
1
Department of Physics, School of Physics and Nuclear Energy
Engineering, Beihang University, Xueyuan Road No. 37, Beijing
100191, P.R.
China
2
Beijing Computational Science Research Center,
Beijing
100084, P.R.
China
a
e-mail: gf1978zhang@buaa.edu.cn
Received: 25 February 2014
Published online: 27 June 2014
Quantum correlation and entanglement, measured by geometric quantum discord (GQD) and concurrence respectively, between two identical two-level atoms are investigated in detail in Tavis-Cummings model with dipole-dipole interaction (DDI) under intrinsic decoherence. The results show that the phase decoherence rate makes the original harmonic vibration with respective to time decay to a stable value. DDI coupling enhances GQD and corcurrence and even avoids entanglement sudden death (ESD). By the introduction of phase decoherence rate, the atom-light field coupling coefficient makes the decay of periodical curves quicker. Evolution periods are shortened as photon number increases, as well DDI and atomic-light field coupling become stronger. Moreover, both GQD and concurrence have nothing to do with frequency of cavity field and atoms for the resonant case.
Key words: Quantum Optics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2014