We propose a five-level quasi-tripod type atomic system for realizing two-channel cross-phase modulation (XPM) based on the light-storage. Due to the existence of the double dark-state polaritons, both probe fields can be coherently mapped into and out of the cold atoms by switching off and on the coupling field adiabatically. The analytic results and the numerical simulations show that the application of an additional weak microwave field during the storage time can efficiently modify the atomic spin coherence, and a continuous and controllable phase shift can be imposed on the retrieved probe fields with negligible attenuation in the amplitude. The phase shift and the energy retrieving rate of the probe fields are neither influenced by the coupling field nor by the atomic optical density. Such a novel scheme can be easily extended to realize the XPM of multiple-probe fields and may find potential applications in multiple-channel classical and quantum information processing.

为了实现基于光存储的两通道交叉相位调制（XPM），我们提出了一种五级准三脚架型原子系统。由于存在双暗态极化子，因此可以通过绝热地关闭和打开耦合场，将两个探测场连贯地映射到冷原子中和从冷原子中导出。分析结果和数值模拟表明，在存储时间内施加一个附加的弱微波场可以有效地改变原子的自旋相干性，并且在振幅可忽略不计的情况下，可以对检索到的探测场施加连续且可控的相移。 。探测场的相移和能量获取速率既不受耦合场的影响，也不受原子光密度的影响。