耦合腔阵列与Λ-型三能级原子非局域耦合系统中单光子的传输特性研究

发布时间：2018-04-27 02:21

本文选题：耦合腔阵列 + 三能级原子　；参考：《物理学报》2017年15期

【摘要】：讨论了理想和非理想情况下耦合腔阵列中两个最邻近的腔与Λ-型三能级原子非局域耦合系统中单光子的传输特性.运用准玻色子方法,精确地解出了开放系统中单光子的透射率.Λ-型三能级原子与耦合腔阵列非局域耦合系统具有更多的优点,如:该系统比其他系统调控光子传输特性的可调控参数更多;单光子在该系统中传输的透射谱有三个透射峰.此外,该系统还具有自身的特点,当拉比频率?取值给定之后,改变原子与其中一个腔的耦合强度时,光子的透射谱有一个透射率始终为1的定点,该点对应的光子频率为ω_c-?.在非理想情况下,系统耗散对光子的透射谱有着很大的影响.当只考虑原子耗散时,耗散使得光子透射谱的谷值增大,而峰值不变;当只考虑腔场耗散时,光子透射谱的峰值减小,而谷值不变.另外,随着腔场耗散率和腔的个数的增多,光子透射谱的峰值逐渐减小,但谷值始终不变.对比原子耗散和腔场耗散的情况可以发现,原子耗散使得光子不能被完全反射,而腔场耗散使得光子不能被完全透射.当同时考虑原子和腔场耗散时,光子透射谱谷值的大小不但会受原子耗散率大小的影响,也受腔场耗散率大小的影响,随着腔场耗散率的增大,谷值反而减小;而光子透射谱的峰值始终只受腔场耗散率大小和腔的个数的影响,与原子耗散率取值的大小无关.
[Abstract]:In this paper, the propagation characteristics of single photon in two nearest cavities in an ideal or non-ideal coupled cavity array and a non local coupling system of a three level atom with a type A-type are discussed. By using the quasi-boson method, the transmittance of a single photon in an open system is accurately calculated. For example, the system has more adjustable parameters than other systems, and the transmission spectrum of single photon in the system has three transmission peaks. In addition, the system also has its own characteristics when the rabbi frequency? When the coupling intensity between atom and one of the cavities is changed after a given value, the transmission spectrum of the photon has a fixed point whose transmittance is always 1, and the photon frequency corresponding to this point is 蠅 -c-C. In the non-ideal case, the system dissipation has a great influence on the transmission spectrum of photons. When only atom dissipation is considered, the valley value of photon transmission spectrum increases, but the peak value remains unchanged, while the peak value of photon transmission spectrum decreases and valley value remains unchanged when only cavity field dissipation is considered. In addition, with the increase of cavity field dissipation rate and the number of cavities, the peak value of photon transmission spectrum decreases gradually, but the valley value remains unchanged. Compared with the case of atomic dissipation and cavity field dissipation, it can be found that the atom dissipation makes the photon can not be completely reflected, and the cavity field dissipation makes the photon unable to be completely transmitted. When atom and cavity field dissipation are considered at the same time, the valley value of photon transmission spectrum is affected not only by the atomic dissipation rate, but also by the cavity field dissipation rate. With the increase of cavity field dissipation rate, the valley value decreases. The peak value of the photon transmission spectrum is always affected only by the size of the cavity field dissipation rate and the number of cavities, and is independent of the value of atomic dissipation rate.
【作者单位】：北方民族大学电气信息工程学院;北方民族大学物理与光电信息功能材料重点实验室;兰州大学理论物理研究所;
【基金】：国家民委科研基金(批准号:14BFZ013) 国家自然科学基金(批准号:11647009)资助的课题~~
【分类号】：O562

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