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Entropy 2017, 19(7), 331; https://doi.org/10.3390/e19070331

Dynamics of Entanglement in Jaynes–Cummings Nodes with Nonidentical Qubit-Field Coupling Strengths

Fujian Key Laboratory of Quantum Information and Quantum Optics, College of Physics and Information Engineering, Fuzhou University, Fujian 350116, China
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Received: 2 June 2017 / Revised: 18 June 2017 / Accepted: 29 June 2017 / Published: 3 July 2017
(This article belongs to the Collection Quantum Information)
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Abstract

How to analytically deal with the general entanglement dynamics of separate Jaynes–Cummings nodes with continuous-variable fields is still an open question, and few analytical approaches can be used to solve their general entanglement dynamics. Entanglement dynamics between two separate Jaynes–Cummings nodes are examined in this article. Both vacuum state and coherent state in the initial fields are considered through the numerical and analytical methods. The gap between two nonidentical qubit-field coupling strengths shifts the revival period and changes the revival amplitude of two-qubit entanglement. For vacuum-state fields, the maximal entanglement is fully revived after a gap-dependence period, within which the entanglement nonsmoothly decreases to zero and partly recovers without exhibiting sudden death phenomenon. For strong coherent-state fields, the two-qubit entanglement decays exponentially as the evolution time increases, exhibiting sudden death phenomenon, and the increasing gap accelerates the revival period and amplitude decay of the entanglement, where the numerical and analytical results have an excellent coincidence. View Full-Text
Keywords: coherent state; Jaynes–Cummings nodes; quantum entanglement; nonidentical qubit-field coupling; concurrence; sudden death coherent state; Jaynes–Cummings nodes; quantum entanglement; nonidentical qubit-field coupling; concurrence; sudden death
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Shen, L.-T.; Shi, Z.-C.; Wu, H.-Z.; Yang, Z.-B. Dynamics of Entanglement in Jaynes–Cummings Nodes with Nonidentical Qubit-Field Coupling Strengths. Entropy 2017, 19, 331.

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