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Disentanglement and decoherence from classical non-Markovian noise: random telegraph noise

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Abstract

We calculate the two-qubit disentanglement due to classical random telegraph noise using the quasi-Hamiltonian method. This allows us to obtain analytical results even for strong coupling and mixed noise, important when the qubits have tunable working point. We determine when entanglement sudden death and revival occur as functions of qubit working point, noise coupling strength and initial state entanglement. For extended Werner states, we show that the concurrence is related to the difference of two functions: one is related to dephasing and the other longitudinal relaxation. A physical interpretation based on the generalized Bloch vector is given: revival only occurs for strongly-coupled noise and comes from the angular motion of the vector.

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Authors and Affiliations

  1. Physics Department, University of Wisconsin-Madison, Madison, WI, 53706, USA

    Dong Zhou, Alex Lang & Robert Joynt

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  1. Dong Zhou
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  2. Alex Lang
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  3. Robert Joynt
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Correspondence to Dong Zhou.

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Zhou, D., Lang, A. & Joynt, R. Disentanglement and decoherence from classical non-Markovian noise: random telegraph noise. Quantum Inf Process 9, 727–747 (2010). https://doi.org/10.1007/s11128-010-0165-2

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