自由空间远程时间传递的量子优化技术研究

项目名称： 自由空间远程时间传递的量子优化技术研究

项目编号： No.91336108

项目类型： 重大研究计划

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 董瑞芳

作者单位： 中国科学院国家授时中心

项目金额： 95万元

中文摘要： 随着时间频率的研究水平不断提高，实现比现有精度大幅提高的新一代时间传递技术的研究受到广泛关注。激光脉冲时间传递作为目前自由空间时间传递精度最高的技术，其精度提高与采用的探测手段和脉冲光量子特性紧密关联。利用平衡零拍探测技术结合脉冲整形的本地参考源，可实现实时且精度达到散粒噪声极限的时间延迟测量，测量准确度还可免受自由空间温度、压强、湿度等参数变化导致的群延迟变化影响；应用具有压缩特性的量子光频梳替代传统光频梳，将使时间延迟的测量精度突破散粒噪声极限。因此，基于量子测量和量子光源的量子优化在提高自由空间远程时间传递精度方面具有巨大应用潜力，是未来时间频率的高精度传输与比对技术的重要研究方向。本项目拟开展自由空间远程光学时间传递精度量子优化的关键技术研究：主要围绕本地参考脉冲时域整形，量子压缩光脉冲源的产生开展理论和实验研究，为后续开展亚飞秒量级的超高精度时间传递提供技术基础。

中文关键词： 高精度时间传递；量子优化；脉冲微分整形；量子光频梳；宽带共振无缘腔

英文摘要： High-precision time synchronization plays an important role in the areas of fundamental research and applications. Accompanying with the remarkable improvements in the ability of generating and measuring high-accuracy time-frequency signal, seeking for new time-transfer techniques between distant clocks with much further improved accuracy attracts attensions world-widely. The time-transfer technique based on optical pulses has the highest-precision presently, the further improvement in the accuracy is heavily dependent on the time-domain properties of the pulse as well as the sensitivity of the applied measurement on the exchanged pulse. Recent investigations shows that, utilizing quantum techniques, i.e. quantum measurement technique and quantum optical pulse source, can lead to a new limit on the measured timing information. Furthermore, it can be immune from atmospheric parameters, such as pressure, temperature, humidity and so on. The quantum measurement technique refers to the homodyne detection combined with an appropriately pulse-shaped mode-locked femtosecond laser as the local oscillator. The quantum optical pulse source refers to a multimode squeezed mode-locked femtosecond laser along the certain orthogonal quadratures. Such quantum improvements on time-transfer have a bright prospect in the future ap

英文关键词： high-precision time transfer；quantum improvement；pulse differentiation shaping；；quantum optical frequency comb；broadband passive cavity