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Modern Physics 2022
相位阻尼噪声环境中复合腔光力学系统两原子间局域量子不确定性的调控
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Abstract:
局域量子不确定性(LQU)是表征量子关联的一种重要度量方式，在量子信息处理中发挥了不可或缺的作用。本文研究了在复合腔光力学系统中相位阻尼参数对LQU的影响，分析了系统中各项参数对两原子间LQU的调控作用。结果表明：随着相位阻尼参数增大，两原子间LQU的衰减速率逐渐增加，但其衰减速率要低于共生纠缠度的衰减速率，表明LQU相比于共生纠缠度更适合表征复合腔光力学系统的量子关联。通过增大原子–腔场(含振动镜)耦合系数和振动镜–腔场耦合系数，以及同时增大原子–腔场(J-C模型)耦合系数和原子–腔场(含振动镜)耦合系数，均可增强复合腔光力学系统中两原子间的量子关联。此外，调节原子–腔场(含振动镜)耦合系数、振动镜–腔场耦合系数可以对LQU演化的周期进行调控。
Local quantum uncertainty (LQU) is one of the important measures for characterizing quantum correlations and it plays an integral role in quantum information processing. In this paper, we have studied the effect of dephasing parameters on LQU in the composite cavity optomechanical system and the controlling of various parameters in the system on LQU of two atoms. The results show that as the dephasing parameter increases, the LQU of two atoms decays with a greater decay rate. But, this decay rate is much slower than that of the concurrence, it indicates that LQU is more suitable for characterizing quantum correlations in composite cavity optomechanical systems than concurrence. By increasing the atom-cavityfield (with vibrating mirror) coupling and the vibrating mirror-cavityfield coupling, as well as both increasing the atom-cavityfield (J-C model) coupling and the atom-cavityfield (with vibrating mirror) coupling, the quantum correlation of two atoms can achieve the enhancement in the composite cavity optomechanical system. Furthermore, adjusting the atom-cavityfield (with vibrating mirror) coupling and the mirror-cavityfield coupling can effectively control the period of LQU evolution with time.
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