Tensorial characterization and quantum estimation of weakly entangled qubits

Details Tensorial characterization and quantum estimation of weakly entangled qubits Tensorial characterization and quantum estimation of weakly entangled qubits

2012-02-14

arxiv.org/abs/1202.3070v1

Physics

Quantum Physics

23 pages, 3 figures

Scientific paper

In the case of two qubits, standard entanglement monotones like the linear entropy fail to provide an efficient quantum estimation in the regime of weak entanglement. In this paper, a more efficient entanglement estimation, by means of a novel class of entanglement monotones, is proposed. Following an approach based on the geometric formulation of quantum mechanics, these entanglement monotones are defined by inner products on invariant tensor fields on bipartite qubit orbits of the group SU(2)xSU(2).

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