Abstract
Numerical simulations and calculation of both the total entropy and the sub-entropies are used to investigate the purity loss in nonlinear interaction of a qubit with coherent field. While, the mutual entropy is used as a measure of the total correlations and the negativity as a measure to the entanglement. We show that the purity and entanglement behave different for standard energy dissipation as compared to an energy preserving phase noise coupling as introduced by Milburn. It is found that a very strong sensitivity of the degradation both total correlation with entanglement to the amount of phase damping and the chosen coupling. In particular for a coherent initial field state the maximum obtainable correlation is strongly reduced even for very weak noise.
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Hessian, H.A., Mohamed, A.B.A. Purity loss and degradation of qubit-field correlations and entanglement due to phase noise in nonlinear interaction. Opt. Spectrosc. 117, 474–479 (2014). https://doi.org/10.1134/S0030400X14080128
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DOI: https://doi.org/10.1134/S0030400X14080128