Experimental determination of entanglement for arbitrary pure states

Date: 2009-09-21
Authors S. -M. Fei, M. -J. Zhao, K. Chen, and Z. -X. Wang
Journal No. Phys. Rev. A 80, 032320 (2009)
Abstract 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.