# Sudden Death and Birth of Entanglement Effects for Kerr-Nonlinear Coupler - Quantum Physics

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Abstract: We analyse the entanglement dynamics in a nonlinear Kerr-like couplerinteracting with external environment. Whenever the reservoir is in a thermalvacuum state the entanglement measured by concurrence for a two-qubit systemexhibits regular oscillations of decreasing amplitude. In contrast, for thermalreservoirs we can observe dark periods in concurrence oscillations which canbe called a -sudden death- of the entanglement and the entanglement rebuildwhich can be named the -sudden birth- of entanglement. We show that thesefeatures can be observed when we deal with 2-qubit system as well as $2\otimes3$ system.

Autor: A. Kowalewska-Kudłaszyk, W. Leoński

Fuente: https://arxiv.org/