Peter A. Bouvrie, aka Alex, a postdoc from the qig@CBPF, has recently published a PRA in collaboration with the quantum information group from UFRJ, and colleagues from Mexico e Argentina — a Latin America collaboration! See the details below, and read the article here
Title: Multipartite concurrence for identical-fermion systems
Authors: A. P. Majtey, P. A. Bouvrie, A. Valdés-Hernández, and A. R. Plastino
Abstract: We study the problem of detecting multipartite entanglement among indistinguishable fermionic particles. A multipartite concurrence for pure states of N identical fermions, each one having a d-dimensional single-particle Hilbert space, is introduced. Such an entanglement measure, in particular, is optimized for maximally entangled states of three identical fermions that play a role analogous to the usual (qubit) Greenberger-Horne-Zeilinger state. In addition, it is shown that the fermionic multipartite concurrence can be expressed as the mean value of an observable, provided two copies of the composite state are available.