Ultimate entanglement robustness of two-qubit states against general local noises

21 Jan 2018  ·  Filippov Sergey N., Frizen Vladimir V., Kolobova Daria V. ·

We study the problem of optimal preparation of a bipartite entangled state, which remains entangled the longest time under action of local qubit noises. We show that for unital noises such a state is always maximally entangled, whereas for nonunital noises, it is not... We develop a decomposition technique relating nonunital and unital qubit channels, based on which we find the explicit form of the ultimately robust state for general local noises. We illustrate our findings by amplitude damping processes at finite temperature, for which the ultimately robust state remains entangled up to two times longer than conventional maximally entangled states. read more

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Quantum Physics