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Nearly invariant boundary entanglement in optomechanical systems

Chinese Physics B 2021年第11期30卷 253-260页

作者： Shi-Wei Cui Zhi-Jiao Deng Chun-Wang Wu Qing-Xia Meng Department of Physics College of Liberal Arts and SciencesNational University of Defense TechnologyChangsha 410073China Interdisciplinary Center for Quantum Information National University of Defense TechnologyChangsha 410073China Northwest Institute of Nuclear Technology Xi’an 710024China

In order to understand our previous numerical finding that steady-state entanglement along the instability boundary remains unchanged in a three-mode optomechanical system[***.A 101023838(2020)],we investigate in detail the boundary entanglement in a simpler two-mode optomechanical *** show that both the mechanism to generate entanglement and the parameter dependence of boundary entanglement are quite similar in these two ***,the two-mode system has captured the main features in the three-mode *** the help of analytical calculations and discussing in a much bigger parameter interval,we find that the unchanging behavior previously discovered is actually an extremely slow changing behavior of the boundary entanglement function,and most importantly,this nearly invariant boundary entanglement is a general phenomenon via parametric down conversion process in the weak dissipation *** is by itself interesting as threshold quantum signatures in optomechanical phonon lasers,or may have potential value in related applications based on boundary quantum properties.

关键词： boundary entanglement optomechanical system

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Numerical studies on the boundary entanglement in an optomechanical phonon laser system

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Communications in Theoretical Physics 2020年第11期72卷 37-42页

作者： Qing-Xia Meng Zhi-Jiao Deng Shi-Wei Cui Department of Physics College of Liberal Arts and SciencesNational University of Defense TechnologyChangsha 410073China Northwest Institute of Nuclear Technology Xi’an 710024ShaanxiChina Interdisciplinary Center for Quantum Information National University of Defense TechnologyChangsha 410073China

In our previous work(Meng et al 2020 ***.A 101023838),we discover the phenomenon that the quantum entanglement on the driving threshold line remains a constant in a three-mode optomechanical phonon laser *** this paper,to find the conditions under which the constant boundary entanglement shows up,we explicitly study how this boundary entanglement depends on various parameters through numerical *** results show that the necessary and sufficient condition is a resonant frequency match between the optical frequency difference and the mechanical vibrational frequency,and this constant value is proportional to the multiplication of the square of the optomechanical coupling strength and the resonant driving threshold power.

关键词： boundary entanglement optomechanics phonon laser

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