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量子光学学报

开放简并二能级原子系统F_g=2F_e=1跃迁中的量子相干效应

蔡德欢, 张俊香, 程荣龙, 李中华

Published Jan 1, 2014• 0 citations
OpenAlex

Abstract

文章分析了满足Fg=2Fe=1跃迁的开放简并二能级原子系统在磁场作用下的量子相干效应。该模型中,驱动场的偏振方向平行于磁场方向且与探针光偏振方向相互垂直。由于驱动场和塞曼分裂对原子的耦合作用,在不同驱动场拉比频率作用下将会分别出现电磁诱导透明(EIT)和电磁诱导吸收(EIA)效应,同时伴随相应的正常色散和反常色散。通过控制驱动场强度可以有效控制系统的量子相干效应,同时实现光速调控。更多还原

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文章分析了满足Fg=2Fe=1跃迁的开放简并二能级原子系统在磁场作用下的量子相干效应。该模型中,驱动场的偏振方向平行于磁场方向且与探针光偏振方向相互垂直。由于驱动场和塞曼分裂对原子的耦合作用,在不同驱动场拉比频率作用下将会分别出现电磁诱导透明(EIT)和电磁诱导吸收(EIA)效应,同时伴随相应的正常色散和反常色散。通过控制驱动场强度可以有效控制系统的量子相干效应,同时实现光速调控。

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近年来,电磁诱导透明(EIT)效应得到了广泛的研究,特别是对其群延迟的动态可调谐在光通信领域有良好的应用前景。提出了一种一维光子晶体纳米梁腔辅助微环谐振腔的动态可调谐电磁诱导透明系统。在该系统中引入了石墨烯,通过改变石墨烯的费米能级实现了对类电磁诱导透明的开关调控和群延迟的动态调谐。此外,在改变纳米梁腔与微环谐振腔的耦合距离和微环谐振腔的半径时,实现了对EIT窗口“关—开—关”的调控。采用三能级原子系统解释了类EIT效应的物理机制,采用三维时域有限差分法对该结构进行仿真,并分析了该结构的传感特性和延迟特性,仿真结果表明,灵敏度为614.4 nm/RIU、品质因数为370.8、群延迟为7.1 ps、群指数高达895。该系统为光开关、传感器和慢光器件的研发提供了一种可行方案。

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Mangesh Bhattarai, Vineet Bharti, Vasant Natarajan A

Abstract We demonstrate a technique for continuous tuning of the Hanle effect from electromagnetically induced transparency (EIT) to electromagnetically induced absorption (EIA) by changing the polarization ellipticity of a control beam. In contrast to previous work in this field, we use spatially separated probe and control beams. The experiments are done using magnetic sublevels of the Fg = 4 → Fe = 5 closed hyperfine transition in the 852 nm D2 line of 133Cs. The atoms are contained in a room temperature vapor cell with anti-relaxation (paraffin) coating on the walls. The paraffin coating is necessary for the atomic coherence to be transported between the beams. The experimental results are supported by a density-matrix analysis of the system, which also explains the observed amplitude and zero-crossing of the resonances. Such continuous tuning of the sign of a resonance has important applications in quantum memory and other precision measurements.

arXiv:1710.04378•Scientific Reports•May 8, 2018•26 citations
文章分析了满足Fg=2Fe=1跃迁的开放简并二能级原子系统在磁场作用下的量子相干效应。该模型中,驱动场的偏振方向平行于磁场方向且与探针光偏振方向相互垂直。由于驱动场和塞曼分裂对原子的耦合作用,在不同驱动场拉比频率作用下将会分别出现电磁诱导透明(EIT)和电磁诱导吸收(EIA)效应,同时伴随相应的正常色散和反常色散。通过控制驱动场强度可以有效控制系统的量子相干效应,同时实现光速调控。更多还原
文章分析了满足Fg=2Fe=1跃迁的开放简并二能级原子系统在磁场作用下的量子相干效应。该模型中,驱动场的偏振方向平行于磁场方向且与探针光偏振方向相互垂直。由于驱动场和塞曼分裂对原子的耦合作用,在不同驱动场拉比频率作用下将会分别出现电磁诱导透明(EIT)和电磁诱导吸收(EIA)效应,同时伴随相应的正常色散和反常色散。通过控制驱动场强度可以有效控制系统的量子相干效应,同时实现光速调控。
量子力学与经典力学之间的兼容性总是值得讨论的。薛定谔方程(SE)可以 由F=马和T+V=E。重要的经典物理公式可以从SE推导出来。SE直观上包含质量m和势能公式(该质量m可以足够大以进入宏观范围,势能来自经典吸引力)。这三点确定了SE是波函数和经典力学定律的有机结合。基于此,可以预测可用于描述宏观物体的SE能够被建立。从电子在磁场中的衍射实验中可以观察到,运动电子的挥发性和性质可以同时呈现。这一实验现象,加上上述数学分析,支持牛顿第二定律在微观世界中仍然适用的结论。根据SE,可以证明“波动定律描述的运动粒子的能量等价于其动能的整数倍”;宏观与微观(或经典与量子)之间没有绝对的界限,它们可以兼容。
Outside of the perturbation theory for bichromatic field of two co-propagating elliptically polarized waves, the type of the subnatural (electromagnetically induced transparency (EIT) or absorption (EIA)) resonance is theoretically found to determined only by the angular momenta of the ground (Fg) and the excited (Fe) states of atomic gas. Herewith, the spontaneous transfer of anisotropy from the excited state to the ground one leads to the formation of the EIA resonance at the transition Fg= F → Fe= F + 1.
近年来,电磁诱导透明(EIT)效应得到了广泛的研究,特别是对其群延迟的动态可调谐在光通信领域有良好的应用前景。提出了一种一维光子晶体纳米梁腔辅助微环谐振腔的动态可调谐电磁诱导透明系统。在该系统中引入了石墨烯,通过改变石墨烯的费米能级实现了对类电磁诱导透明的开关调控和群延迟的动态调谐。此外,在改变纳米梁腔与微环谐振腔的耦合距离和微环谐振腔的半径时,实现了对EIT窗口“关—开—关”的调控。采用三能级原子系统解释了类EIT效应的物理机制,采用三维时域有限差分法对该结构进行仿真,并分析了该结构的传感特性和延迟特性,仿真结果表明,灵敏度为614.4 nm/RIU、品质因数为370.8、群延迟为7.1 ps、群指数高达895。该系统为光开关、传感器和慢光器件的研发提供了一种可行方案。
Abstract We demonstrate a technique for continuous tuning of the Hanle effect from electromagnetically induced transparency (EIT) to electromagnetically induced absorption (EIA) by changing the polarization ellipticity of a control beam. In contrast to previous work in this field, we use spatially separated probe and control beams. The experiments are done using magnetic sublevels of the Fg = 4 → Fe = 5 closed hyperfine transition in the 852 nm D2 line of 133Cs. The atoms are contained in a room temperature vapor cell with anti-relaxation (paraffin) coating on the walls. The paraffin coating is necessary for the atomic coherence to be transported between the beams. The experimental results are supported by a density-matrix analysis of the system, which also explains the observed amplitude and zero-crossing of the resonances. Such continuous tuning of the sign of a resonance has important applications in quantum memory and other precision measurements.