A characterization of global entanglement

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dc.creatorLove, Peter J.
dc.creatorBrink, Alec Maassen van den
dc.creatorSmirnov, A. Yu.
dc.creatorAmin, M. H. S.
dc.creatorGrajcar, M.
dc.creatorIl'ichev, E.
dc.creatorIzmalkov, A.
dc.creatorZagoskin, A. M.
dc.date2006-02-16
dc.date2006-03-22
dc.date.accessioned2026-07-07T07:04:20Z
dc.date.available2026-07-07T07:04:20Z
dc.descriptionWe define a set of $2^{n-1}-1$ entanglement monotones for $n$ qubits and give a single measure of entanglement in terms of these. This measure is zero except on globally entangled (fully inseparable) states. This measure is compared to the Meyer-Wallach measure for two, three, and four qubits. We determine the four-qubit state, symmetric under exchange of qubit labels, which maximizes this measure. It is also shown how the elementary monotones may be computed as a function of observable quantities. We compute the magnitude of our measure for the ground state of the four-qubit superconducting experimental system investigated in [M. Grajcar et al., Phys. Rev. Lett._96_, 047006 (2006)], and thus confirm the presence of global entanglement in the ground state.
dc.description4 pages, 1 figure, REVTeX 4, v2 Minor errors corrected, three new references, expanded discussion of extension to mixed states
dc.identifierhttps://arxiv.org/abs/quant-ph/0602143
dc.identifierhttp://arxiv.org/abs/quant-ph/0602143
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/109323
dc.subjectQuantum Physics
dc.titleA characterization of global entanglement
dc.typetext

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