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October 10, 2022

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Calculating concentratable entanglement in graph states

Cullen AR., Kok P.”Calculating concentratable entanglement in graph states”, Phys. Rev. A 106, 042411, 2022. DOI: 10.1103/PhysRevA.106.042411

We propose a method to calculate the purity of reduced states of graph states entirely within the stabilizer formalism, using only the stabilizer generators for a given state. We apply this method to find the concentratable entanglement of graph states, with examples including a single qubit within any graph state, states proposed for use in quantum repeaters, and states that maximize and minimize the overall concentratable entanglement.