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Frequency Dependence of the Entanglement Entropy Production in a System of Coupled Driven Nonlinear Oscillators

Department of Mathematics and Physics, North China Electric Power University, Baoding 071003, China
Author to whom correspondence should be addressed.
Entropy 2019, 21(9), 889;
Received: 29 July 2019 / Revised: 6 September 2019 / Accepted: 9 September 2019 / Published: 13 September 2019
(This article belongs to the Special Issue The Ubiquity of Entropy)
Driven nonlinear systems have attracted great interest owing to their applications in quantum technologies such as quantum information. In quantum information, entanglement is a vital resource and can be measured by entropy in bipartite systems. In this paper, we carry out an investigation to study the impact of driving frequency on the entanglement with a bipartite system of two coupled driven nonlinear oscillators. It is numerically found that the time evolution of the entanglement entropy between the subsystems significantly depends on the driving frequency. The dependence curve of the entropy production on the driving frequency exhibits a pronounced peak. This means the entanglement between the subsystems can be greatly increased by tuning the driving frequency. Further analyses show that the enhancement of the entropy production by the driving frequency is closely related to the energy levels involved in the quantum evolution. This is confirmed by the results related to the quantum spectrum and the dispersion of the wave function in the phase space. Our work gives a convenient way to enhance the entanglement in driven nonlinear systems and throws light on the role of driven nonlinear systems in quantum information technologies. View Full-Text
Keywords: entropy production; driven nonlinear systems; driving frequency entropy production; driven nonlinear systems; driving frequency
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Zhang, S.-H.; Yan, Z.-Y. Frequency Dependence of the Entanglement Entropy Production in a System of Coupled Driven Nonlinear Oscillators. Entropy 2019, 21, 889.

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