利用光学纳米纤维界面实现冷原子的多能级级联电磁感应透明
Multi-level cascaded electromagnetically induced transparency in cold atoms using an optical nanofibre interface
摘要：
集成到冷原子装置中的超薄光纤被证明是原子-光子混合量子网络的理想构建模块。这种光学纳米纤维（ONF）可用于演示原子介质中的非线性光学和量子干涉现象。在这里，我们报告的观察多级级联的电磁感应透明（EIT）使用的光学纳米纤维接口冷$^{87}$ Rb原子通过强烈的倏逝场，可以实现在超低的探测和耦合功率。探测光束（在780 nm处）和耦合光束（在776 nm处）都通过纳米纤维传播。所观察到的探测光束的多峰透明光谱可以提供一种方法，用于同时减慢光学纳米纤维中的多个波长或用于产生ONF引导的纠缠光束，显示了这种原子纳米纤维系统用于量子信息的潜力。我们还证明了全光开关在全光纤系统中使用所获得的EIT效应。
英文摘要：
Ultrathin optical fibres integrated into cold atom setups are proving to be ideal building blocks for atom-photon hybrid quantum networks. Such optical nanofibres (ONF) can be used for the demonstration of nonlinear optics and quantum interference phenomena in atomic media. Here, we report on the observation of multilevel cascaded electromagnetically induced transparency (EIT) using an optical nanofibre to interface cold $^{87}$Rb atoms through the intense evanescent fields that can be achieved at ultralow probe and coupling powers. Both the probe (at 780 nm) and the coupling (at 776 nm) beams propagate through the nanofibre. The observed multipeak transparency spectra of the probe beam could offer a method for simultaneously slowing down multiple wavelengths in an optical nanofibre or for generating ONF-guided entangled beams, showing the potential of such an atom-nanofibre system for quantum information. We also demonstrate all-optical-switching in the all fibred system using the obtained EIT effect.
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