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Abstract: We calculate the two-qubit disentanglement due to classical random telegraphnoise using the quasi-Hamiltonian method. This allows us to obtain analyticalresults even for strong coupling and mixed noise, important when the qubitshave tunable working point. We determine when entanglement sudden death andrevival occur as functions of qubit working point, noise coupling strength andinitial state entanglement. For extended Werner states, we show that theconcurrence is related to the difference of two functions: one is related todephasing and the other longitudinal relaxation. A physical intepretation basedon the generalized Bloch vector is given: revival only occurs forstrongly-coupled noise and comes from the angular motion of the vector.



Author: Dong Zhou, Alex Lang, Robert Joynt

Source: https://arxiv.org/







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