Physics – Quantum Physics
Scientific paper
2002-11-22
Phys. Rev. A 67, 042310 (2003)
Physics
Quantum Physics
minor corrections, title changed
Scientific paper
10.1103/PhysRevA.67.042310
We present an explicit construction of entanglement witnesses for depolarized states in arbitrary finite dimension. For infinite dimension we generalize the construction to twin-beams perturbed by Gaussian noises in the phase and in the amplitude of the field. We show that entanglement detection for all these families of states requires only three local measurements. The explicit form of the corresponding set of local observables (quorom) needed for entanglement witness is derived.
D'Ariano Giacomo M.
Macchiavello Chiara
Paris Matteo G. A.
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