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中国科学通报：英文版

Quantum storage of optical signals and coherent manipulation of quantum states based on electromagnetically induced transparency

Wang, Hai Hai, Xie Xie, ChangDe, Peng, Kun-Chi

Published Jan 1, 2012• 0 citations
OpenAlex

Abstract

电磁地导致的透明性(EIT ) 技术是为在原子整体并且为在光子之间的相互作用的改进的轻地的量状态的存储的重要工具。在这份报纸，我们简短总结我们的组在一个单个三脚架为光子的极化基于两倍 EIT 效果，存储双隧道的纺纱波浪刺激的量干扰和旋转波浪向量的协调操作在提高的跨阶段的调整上进行的最近的试验性的研究原子系统。这里介绍的工作在量信息处理的发展中的领域里有潜在的申请。

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电磁地导致的透明性(EIT ) 技术是为在原子整体并且为在光子之间的相互作用的改进的轻地的量状态的存储的重要工具。在这份报纸，我们简短总结我们的组在一个单个三脚架为光子的极化基于两倍 EIT 效果，存储双隧道的纺纱波浪刺激的量干扰和旋转波浪向量的协调操作在提高的跨阶段的调整上进行的最近的试验性的研究原子系统。这里介绍的工作在量信息处理的发展中的领域里有潜在的申请。
量子存储器是量子通信和量子网络中的重要器件, 可用于存储量子态并按需读取, 同时保持量子信息的完整性和稳定性. 时间多模量子存储作为一种能够同时存储多个量子态的技术, 对于提升量子通信效率、 扩展存储容量具有重要意义. 本文提出了一种基于电磁诱导透明效应的时间多模高效率量子存储方法, 以原子系综为存储介质, 通过动态调控控制光的拉比频率和控制光关断时间, 实现对光子多脉冲的高效存储与按需读取. 结果表明, 该方法在大光学厚度的原子系综中可以同时实现较高的存储效率和多个存储模式, 其中存储效率至少可达70%以上, 在较少模式数时甚至高达90%左右. 此外, 还讨论了时间多模存储的模式数受光学厚度的限制, 通过优化介质光学厚度可以进一步提升存储容量和效率. 这种方法有效解决了量子态存储中的容量和灵活性问题, 为量子网络中的信息处理和远距离量子通信提供了新思路和技术支持.
Electromagnetically induced transparency (EIT) techniques are important tools for the storage of the quantum states of light fields in atomic ensembles and for enhancement of the interaction between photons. In this paper, we briefly summarize the recent experimental studies conducted by our group on enhanced cross-phase modulation based on double EIT effects, the quantum interference of stored dual-channel spin-wave excitations and the coherent manipulation of the spin wave vector for the polarization of photons in a single tripod atomic system. The work presented here has potential application in the developing field of quantum information processing.
We reviewed the recent progress in coherent manipulation on light fields based on the electromagnetically-induced transparency (EIT) effect in Pr3+-doped Y2SiO5 crystal. The results show that, on one hand, the atomic coherence grating, formed when the light pulse is stored in Pr3+:Y2SiO5 crystal under the EIT condition has similar properties to the traditional holographic grating. On the other hand, the atomic coherence grating has its own unique characteristics that are different from those of traditional holographic grating. The EIT-induced nonlinearity and atomic coherence gratings can be used to manipulate the amplitude, the phase and the polarization state of light fields; therefore, they are of important applications for optical signal processing, quantum information processing and imaging processing.
近年来，强场物理与量子光学两个领域交叉产生的物理效应正逐步成为研究热点。融合超快宽谱激发与共振调控，可在亚周期内制备电子-电子、电子-离子多体纠缠与相干，进而产生强场相干性诱导的空气激光、超连续辐射与自由感应衰变等新型相干辐射。本文围绕强场量子光学这一新兴交叉领域，聚焦强场下量子相干辐射及应用，综述其理论基础、物理机制及潜在应用等方面的现状和挑战。期望以此推动开放系统多体强场量子光学的理论与实验研究，以及对多自由度强场量子相干性建立、演化与弛豫规律的探索，拓展强场量子相干辐射与放大机制，为构建时-频-空稳定可控的新型辐射源、发展远程探测新技术、实现空气激光在痕量分子检测与燃烧诊断等方面的应用提供参考。
Electromagnetically induced transparency is a promising approach to implement quantumcommunication in quantum system. In this study, quantum coherence and interference in theexcitation pathways of a three-level Λ atomic system leads to the formation of new states of matter(i.e. the dark state). This state decouples itself from the excitation beams leading to phenomenasuch as coherent population trapping (CPT), electromagnetically induced transparency (EIT).Taking into account quantum coherence and interference in an optically dense electromagneticallyinducedtransparent medium, we investigate the non-destructive storage and retrieval of singlephotonquantum states in the dark state of this dense ensemble of gas phase medium. The storageand retrieval process is based on the intracavity electromagnetically induced transparency by whichproperties of a cavity filled with three-level Λ-type atoms are manipulated by an external control field.We demonstrate the peculiar case for the storage and retrieval of time-entangled periodic input pulses(a soliton train) in the dark state by adiabatic photon transfer under conditions of dynamicalimpedance matching. These multiplexed photon states are expected to allow sharing quantuminformation among many users, and are currently of very high demand for applications in longdistanceand multiplexed quantum communication.