Experimental determination of entanglement for arbitrary pure states
Shao-Ming Fei, Ming‐Jing Zhao, Kai Chen, Zhi‐Xi Wang · Physical Review A · 2009
We present a way of experimentally determining the concurrence in terms of the expectation values of local observables for arbitrary multipartite pure states. Instead of the joint measurements on two copies of a state in the experiment for two-qubit systems [S. P. Walborn et al., Nature (London) 440, 20 (2006)], we only need one copy of the state in every measurement for any arbitrary dimensional multipartite systems, avoiding the preparation of twin states or the imperfect copy of the state.