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Calculating the degree of non-Markovianity of a dissipative process is adifficult task, even for the dynamics of a single qubit, given the complexmaximization problem. In this work, focusing on the entanglement-basedquantifier of non-Markovianity, we present an analytical solution for such anoptimization problem. We then propose a computable non-Markovianity measurebased on generalized robustness of entanglement, an entanglement measure thatcan be readily calculated by a semidefinite programming method. We show thatthe non-Markovianity, in a given interval of time, can be witnessed bycalculating the expectation value of an observable, making it attractive forexperimental investigations.

Non-Markovianity Quantifier of an Arbitrary Quantum Process