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Extendibility of Werner States
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We investigate the two-sided symmetric extendibility problem of Werner states. The interplay of the unitary symmetry of these states and the inherent bipartite permutation symmetry of the extendibility scenario allows us to map this problem into the ground state problem of a highly symmetric spin-model Hamiltonian. We solve this ground state problem analytically by utilizing the representation theory of SU(d), in particular a result related to the dominance order of Young diagrams in Littlewood-Richarson decompositions. As a result, we obtain necessary and sufficient conditions for the extendibility of Werner states for arbitrary extension size and local dimension. Interestingly, the range of extendible states has a non-trivial trade-off between the extension sizes on the two sides. We compare our result with the two-sided extendibility problem of isotropic states, where there is no such trade-off.
Forward citations
Cited by 2 Pith papers
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New bound on $S_{1}\times S_{2}$-setting Bell locality of a nonseparable Werner state
For d ≤ min{S1,S2}, every nonseparable Werner state with parameter Φ ∈ [−(d−1)/min{S1,S2}, 0) satisfies all Bell inequalities under any S1×S2-setting scenario with generalized measurements; for d > min{S1,S2}, every n...
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