Multipartite entanglement and quantum state exchange
We investigate multipartite entanglement in relation to the process of quantum state exchange. In particular, we consider such entanglement for a certain pure state involving two groups of N trapped atoms. The state, which can be produced via quantum state exchange, is analogous to the steady-state intracavity state of the subthreshold optical nondegenerate parametric amplifier. We show that, first, it possesses some 2N-way entanglement. Second, we place a lower bound on the amount of such entanglement in the state using a measure called the entanglement of minimum bipartite entropy.
Physical Review A (Atomic, Molecular and Optical Physics)
© 2003 American Physical Society. Reproduced in accordance with the copyright policy of the publisher. This journal is available online - use hypertext links.