Physics – Quantum Physics
Scientific paper
2008-09-12
Phys. Rev. A 78, 062305 (2008)
Physics
Quantum Physics
6 pages, 2 figures, RevTex. v2: new title, minor changes in the explanation of the witness for hyperentangled states, more com
Scientific paper
10.1103/PhysRevA.78.062305
A new criterium to detect the entanglement present in a {\it hyperentangled state}, based on the evaluation of an entanglement witness, is presented. We show how some witnesses recently introduced for graph states, measured by only two local settings, can be used in this case. We also define a new witness $W_3$ that improves the resistance to noise by increasing the number of local measurements.
Ceccarelli Raino
Martini Francesco de
Mataloni Paolo
Vallone Giuseppe
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