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Coherent State Control to Recover Quantum Entanglement and Coherence

Fujian Key Laboratory of Quantum Information and Quantum Optics, College of Physics and Information Engineering, Fuzhou University, Fuzhou 350116, China
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Entropy 2019, 21(10), 917; https://doi.org/10.3390/e21100917
Received: 10 August 2019 / Revised: 4 September 2019 / Accepted: 11 September 2019 / Published: 20 September 2019
(This article belongs to the Special Issue Correlations in Open Quantum Systems)
How to analytically deal with the entanglement and coherence dynamics of separated Jaynes–Cummings nodes with continuous-variable fields is still an open question. We here generalize this model to a more common situation including either a small or large qubit-field detuning, and obtain two new analytical formulas. The X-state simplification, Fock-state shortcut and detuning-limit approximation work together in an amazingly accurate way, which agrees with the numerical results. The new formulas almost perfectly predict the two-qubit entanglement dynamics both in sudden death and rebirth phenomenon for detuning interactions. We find that when both the qubit-field detuning and amplitude of coherent states are large enough, the maximal entanglement and coherence peaks can be fully and periodically retrieved, and their revival periods both increase linearly with the increasing detuning. View Full-Text
Keywords: coherent state; Jaynes–Cummings models; entanglement; coherence; open quantum system coherent state; Jaynes–Cummings models; entanglement; coherence; open quantum system
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Shen, L.-T.; Shi, Z.-C.; Yang, Z.-B. Coherent State Control to Recover Quantum Entanglement and Coherence. Entropy 2019, 21, 917.

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