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quant-ph2007★ 14 cited
Robustness of entangled states that are positive under partial transposition
Somshubhro Bandyopadhyay, Sibasish Ghosh, Vwani Roychowdhury
We study robustness of bipartite entangled states that are positive under partial transposition (PPT). It is shown that almost all PPT entangled states are unconditionally robust,…
quant-ph2007★ 3 cited
Entangled multi-qubit states without higher-tangle
Heng Fan, Yong-Cheng Ou, Vwani Roychowdhury
We analyze mixed multi-qubit states composed of a W class state and a product state with all qubit in |0>. We find the optimal pure state decomposition and convex roofs for higher-…