Properties of entanglement molecules
Yanxia Huang, Mingsheng Zhan · Journal of Physics B Atomic Molecular and Optical Physics · 2004
We propose a scheme to prepare a certain kind of N-atom entangled state that allows us to construct some possible types of entanglement molecules via cavity QED. The entanglement properties of entanglement molecules \psi(N)>(alpha) are studied with respect to bipartite entanglement that is robust against the disposal of particles and are compared with entanglement molecules p, introduced in Dur (2001 Phys. Rev. A 63 020303). We also give the maximal amount of entanglement achievable for two particular situations in two possible configurations. Meanwhile, we investigate the entanglement properties of entanglement molecules \psi(N)>(alpha) in terms of local measurement using the maximum connectedness and persistency and compare them with other kinds of N-atom entangled states such as \GHZ>, \W-N> and \phi(N)>. We show that the maximal value N - 1 of the persistency of the state \psi(N)>(alpha) corresponds to the case that all atoms are pairwise entangled. If any pair of atoms rho(ij) is disentangled, the entanglement of the state \psi(N)>(alpha) is very easy to destroy by a single local measurement.