Quantum nonlinear cavity quantum electrodynamics with coherently prepared atoms
Quantum nonlinear cavity quantum electrodynamics with coherently prepared atoms
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DOI：
10.1103/physreva.92.033822
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发表时间：
2015-07
影响因子：
2.9
通讯作者：
Guo-qing Yang;W. Gu;Gao-xiang Li;B. Zou;Yifu Zhu
中科院分区：
文献类型：
--
作者：
Guo-qing Yang;W. Gu;Gao-xiang Li;B. Zou;Yifu Zhu
本文提出了一种研究多原子CQED系统的量子非线性和观察多光子跃迁的方法。我们发现，通过对CQED系统中的单光子和双光子激发同时引入相消量子干涉，可以观察到CQED系统中高阶梯形态的直接三光子激发.我们报道了一个实验，冷Rb原子被限制在一个光学腔中，并证明了这种干涉控制的多光子激发的CQED系统。所观察到的CQED梯形态的非线性激发与基于CQED系统的完全量子化处理的理论分析一致，但与CQED系统的半经典分析不一致。因此，它代表了第一次直接观察到的量子性质的多原子CQED系统，并开辟了新的途径来探索量子非线性及其应用在量子光学系统中，其中多个吸收器/发射器与光子耦合的限制腔结构。
We propose a method to study the quantum nonlinearity and observe the multiphoton transitions in a multiatom CQED system. We show that by inducing simultaneously destructive quantum interference for the single-photon and two-photon excitations in the CQED system, it is possible to observe the direct three-photon excitation of the higher-order ladder states of the CQED system. We report an experiment with cold Rb atoms confined in an optical cavity and demonstrate such interference control of the multi-photon excitations of the CQED system. The observed nonlinear excitation of the CQED ladder states agrees with a theoretical analysis based on a fully quantized treatment of the CQED system, but disagrees with the semiclassical analysis of the CQED system. Thus it represents the first direct observation of the quantum nature of the multiatom CQED system and opens new ways to explore quantum nonlinearity and its applications in quantum optical systems in which multiple absorbers/emitters are coupled with photons in confined cavity structures.