Multipartite entanglement witnesses.

Research paper by J J Sperling, W W Vogel

Indexed on: 01 Oct '13Published on: 01 Oct '13Published in: Physical review letters


We derive a set of algebraic equations, the so-called multipartite separability eigenvalue equations. Based on their solutions, we introduce a universal method for the construction of multipartite entanglement witnesses. We witness multipartite entanglement of 10(3) coupled quantum oscillators, by solving our basic equations analytically. This clearly demonstrates the feasibility of our method for studying ultrahigh orders of multipartite entanglement in complex quantum systems.