Local observables for entanglement witnesses

Local observables for entanglement witnesses

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...

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Veröffentlicht in:arXiv.org 2003-01
Hauptverfasser: G Mauro D'Ariano, Macchiavello, Chiara, Paris, Matteo G A
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Depolarization
Entanglement
Gaussian beams (optics)
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description 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.
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subjects Depolarization
Entanglement
Gaussian beams (optics)
title Local observables for entanglement witnesses
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