Photonic Quantum Networking of Trapped Ion Qubits

俘获离子量子位的光子量子网络

• 批准号: 0903945
• 负责人: Christopher Monroe
• 金额: $ 48万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0903945&HistoricalAwards=false
• 关键词: Photonic; Quantum; Networking; Trapped; Ion

This project will push experimental limits in the local and nonlocal networking of quantum information. It is generally accepted that future quantum networks will require both stable quantum memories and appropriate quantum channels that can traverse macroscopic distances. We concentrate on the use of hyperfine ground states of trapped ions as quantum memories, and individual photons as the quantum communication channel. Building on previous work from our group in the Yb+ system, we will investigate (a) larger numbers of ions at each network node, (b) enhanced probabilities of heralded gate operations with nearby optical elements, (c) larger distances between trapped ion nodes by exploiting infrared transitions in the Yb+ system. These directions represent promising routes toward a variety of quantum information and quantum communication protocols, including distributed quantum computing and long-distance quantum repeaters circuits. This research may also lead to an attractive method for observing a "loophole-free" Bell inequality test, where the entangled ions are space-like separated with respect to the qubit measurement time. Finally, the ion/photon interfaces discussed here are not necessarily specific to trapped ions memories, and may be applied to other systems such as quantum dots in a semiconductor or doped glass host.This work is at the heart of laboratory quantum information science, and it is expected to attract great interest from students at all levels and backgrounds from a variety of disciplines in physics, computer science, and engineering. The results of this research will be widely disseminated at meetings and workshops, and also through lectures at primarily undergraduate institutions. As part of an internal initiative at U. Maryland to attract the best high school science students in the area to College Park, this work will be aggressively presented at local high schools. Where possible, the presentation of this research to young students and other newcomers to the field will be rooted in a particular approach to the foundations of quantum mechanics that relies more on information theoretic viewpoints such as entropy and measurement and less on wave mechanics, differential equations, and complex mathematics.

该项目将推动量子信息局域和非局域网络的实验极限。人们普遍认为，未来的量子网络将需要稳定的量子存储器和能够穿越宏观距离的适当量子通道。我们专注于使用超精细基态的囚禁离子作为量子存储器，和个人的光子作为量子通信信道。基于我们小组在Y B+系统中的先前工作，我们将研究（a）每个网络节点处的离子数量更多，（B）与附近光学元件的预示门操作的概率增强，（c）通过利用Y B+系统中的红外跃迁，捕获离子节点之间的距离更大。 这些方向代表了通往各种量子信息和量子通信协议的有前途的路线，包括分布式量子计算和长距离量子中继器电路。这项研究还可能带来一种有吸引力的方法来观察“无空洞”的贝尔不等式测试，其中纠缠离子相对于量子位测量时间呈空间状分离。最后，这里讨论的离子/光子界面不一定是特定于捕获的离子存储器，并且可以应用于其他系统，例如半导体或掺杂玻璃中的量子点host.This工作是实验室量子信息科学的核心，预计将吸引来自物理学，计算机科学和工程学各个学科的各个层次和背景的学生的极大兴趣。这项研究的结果将在会议和讲习班上广泛传播，并通过在主要是本科院校的讲座进行传播。作为美国大学内部计划的一部分。马里兰州，以吸引最好的高中科学学生在该地区的学院公园，这项工作将积极提出在当地高中。在可能的情况下，向年轻学生和该领域的其他新人介绍这项研究将植根于量子力学基础的特定方法，该方法更多地依赖于信息理论观点，如熵和测量，而不是波动力学，微分方程和复杂数学。