标题： 基于双Λ系统的少光子全光π相位调制 显示英文标题

标题： Few-Photon All-Optical π Phase modulation Based on a Double-Λ System

摘要： 我们提出了一种基于双-{\Lambda }系统的高效全光相位调制方法，并通过该方案演示了在冷铷原子中由另一个少光子脉冲诱导的少光子脉冲的{\pi }相移。 通过改变施加激光场的相位，可以控制双-{\Lambda }非线性介质的性质。 这种依赖相位的机制使双-{\Lambda }系统不同于传统的基于交叉克尔效应的系统，后者仅依赖于施加激光的强度。 所提出的方案为光子之间产生强非线性相互作用提供了新的途径，并可能在量子信息技术中有潜在应用。 显示英文摘要

摘要： We propose an efficient all-optical phase modulation based on a double-{\Lambda} system and demonstrate a {\pi} phase shift of a few-photon pulse induced by another few-photon pulse in cold rubidium atoms with this scheme. By changing the phases of the applied laser fields, one can control the property of the double-{\Lambda} medium. This phase-dependent mechanism makes the double-{\Lambda} system different form the conventional cross-Kerr-based system which only depends on the applied laser intensities. The proposed scheme provides a new route to generate strong nonlinear interactions between photons, and may have potential for applications in quantum information technologies.