Center for Quantum Information and Control

量子信息科学（QIS）是研究如何使用遵循量子力学定律的系统来执行传统信息处理系统无法有效执行的信息处理任务的跨学科领域。本项目资助量子信息与控制中心（CQuIC）的研究和推广活动。该中心涉及新墨西哥大学（UNM）的四名教员和亚利桑那大学（UA）的一名教员的努力。CQuIC的研究目标是将来自数学物理学和计算机科学的量子信息系统的抽象理解与来自物理学的物理系统的实践知识相结合，以设计实用的量子信息处理协议，并在新墨西哥大学和UA的实验室中实施这些协议。CQuIC的主要科学推广活动是管理和组织斜视网络，这是一个由26个节点机构组成的联盟，包括研究型大学、本科学院、国家和工业实验室以及QIS研究的国际中心。SQuInT年度研讨会于2015年2月举办了第十七届，已发展成为QIS的主要科学会议之一，其独特之处在于它将物理学和信息科学的讨论结合起来，并强调由高级人员、博士后和学生共同发表演讲。该项目为SQuInT年度研讨会提供部分但实质性的支持。在这个项目下进行的研究有两个不同的，但密切相关的重点。首先是量子态制备、量子动力学控制和精确测量的基本技术的发展，以及对这三者的验证。一些拟议的研究是理论和平台无关的：利用量子纠错的综合征数据研究量子信息处理（QIP）协议中错误的原位表征。其他研究是紧密耦合的理论-实验开发和改进特定量子系统的控制工具包，在这种情况下，光子和铯原子系综：开发和实现在铯原子的16维地面超精细流场中进行状态、过程和检测器（POVM）层析成像的复杂技术，开发和实现控制和挤压由1000到100万个铯原子组成的原子系综的集体自旋的技术。第二个重点是这些控制技术在QIP任务中的应用。其中一些工作主要是理论性的：研究模拟量子模拟的潜力、能力和鲁棒性，特别关注玻色子采样的前景。其他研究是在我们的实验室系统中紧密耦合理论-实验应用控制技术来执行QIP任务：在铯的16维地流形中实现量子踢顶，并实现复杂的技术来区分光频相干态以增强光通信。

Quantum information science (QIS) is the interdisciplinary field that investigates how to use systems obeying the laws of quantum mechanics to perform information-processing tasks that cannot be performed efficiently using conventional information-processing systems. This project funds center-wide research and outreach activities of the Center for Quantum Information and Control (CQuIC). The Center involves the efforts of four faculty members at the University of New Mexico (UNM) and one at the University of Arizona (UA). The goal of research at CQuIC is to combine the abstract understanding of QIS that comes from mathematical physics and computer science with the practical knowledge of physical systems that comes from physics, in order to design practical quantum-information-processing protocols and to implement such protocols in laboratories at UNM and UA. CQuIC's chief scientific-outreach activity is the administration and organization of the SQuInT Network, a consortium of 26 node institutions, including research universities, undergraduate colleges, national and industrial laboratories, and international centers for QIS research. The SQuInT Annual Workshop, which had its seventeenth installment in February 2015, has grown to be one of the major scientific meetings in QIS, unique in its integration of physics and information-science talks and its emphasis on presentations by a mix of senior personnel, postdocs, and students. This project provides partial, but substantial support for the SQuInT Annual Workshop. The research to be carried out under this project has two different, but closely related focuses. The first is development of fundamental techniques for preparation of quantum states, control of quantum dynamics, and precision measurement, together with verification of any of these three. Some of the proposed research is theoretical and platform independent: Investigate in-situ characterization of errors in quantum information processing (QIP) protocols using syndrome data from quantum error correction. Other research is tightly coupled theory-experiment development and refinement of control toolkits for particular quantum systems, in this case, optical photons and cesium atomic ensembles: Develop and implement sophisticated techniques for state, process, and detector (POVM) tomography in the 16-dimensional ground hyperfine manifold of the cesium atom, and develop and implement techniques to control and squeeze the collective spin of atomic ensembles consisting of a thousand to a million cesium atoms. The second focus is application of these control techniques to QIP tasks. Some of this work is primarily theoretical: Investigate the potential, capabilities, and robustness of analog quantum simulation, with particular attention to the prospects for boson sampling. Other research is tightly coupled theory-experiment application of control techniques to perform QIP tasks in our laboratory systems: Implement the quantum kicked top in the 16-dimensional ground manifold of cesium, and implement sophisticated techniques to discriminate optical-frequency coherent states for enhanced optical communication.