Closed-Loop Measurements for Quantum Information Science

量子信息科学有望在通信、计算和精确测量方面取得巨大进步。然而，即使在理想的实验室条件下，从量子信息中获取理论概念并在实践中实现它们仍然存在实质性的挑战。该研究计划将通过开发新的、物理上可访问的量子测量方法来解决量子信息理论和实验之间日益增长的鸿沟。将特别关注那些最有可能提高计量精度的测量（如感应极弱的通信信号），使其超出目前的能力。数学技术，如量子滤波理论和实时反馈，将被用来解决模拟量子测量的问题，即使用反馈来强迫一个量子测量的统计数据模仿另一个量子测量的统计数据。这样做将为平衡通信和计算应用中理论最优性的需求与这些方法的实验可行性提供一条具体的途径。基于闭环方法的量子限噪态判别程序的实验室实现将进行。这项研究将有助于量子信息理论的基础，并导致更好地理解物理学中的基本不确定性。该计划将在当前一代年轻科学家中寻找最有前途的研究生和本科生。它的目标是在一个新的和快速发展的领域培养研究人员，提供可能在下一代技术中发挥关键作用的先进数学技术和实验方法的第一手经验，并培养年轻科学家成为有创造力、负责任、活跃的科学界成员。学生将参与项目的各个方面，从设计和规划到结果的传播。通过同时发展理论和实验方法的研究，我们的团队将有助于消除一些传统上划分理论和实验的、挥之不去的、人为的障碍。与其他学术机构、工业界和国家实验室合作，将通过西南量子信息和技术网络（SQuInT）促进外展和教育。此外，扩大代表性不足的群体参与科学的努力将与新墨西哥EPSCoR纳米技术项目一起进行。纳米技术，其中量子力学效应可以产生显著的影响，已确定其潜力，以加强新墨西哥州的经济；这个项目有助于实现这一目标。

Quantum information science promises great advances in the theories of communication, computation, and precision measurement. There remain, however, substantial challenges inherent in taking theoretical concepts from quantum information and realizing them in practice, even under idealized laboratory conditions. This research program will address the growing divide between quantum information theory and experiment by developing new, physically accessible approaches to quantum measurement. Particular attention will be devoted to those measurements most likely to improve precision metrology (such as sensing extremely weak communication signals) beyond current capabilities. Mathematical techniques, such as quantum filtering theory, and real-time feedback, will be harnessed to address the problem of simulating quantum measurements, i.e., using feedback to force the statistics of one quantum measurement to mimic those of another. Doing so will offer a concrete path to balancing the need for theoretical optimality in communication and computing applications with the experimental feasibility of those methods. Laboratory implementation of quantum noise-limited state discrimination procedures based on closed-loop methodologies will be conducted. This research will contribute to the foundations of quantum information theory and lead to a better understanding of fundamental uncertainties in physics.The program will seek out the most promising graduate and undergraduate students in the current generation of young scientists. It aims to educate researchers in a new and rapidly-developing field, provide first-hand experience in both advanced mathematical techniques and experimental methods likely to play crucial roles in next-generation technology, and train young scientists to be creative, responsible, active members of the scientific community. Students will be involved in all aspects of the project, from design and planning to the dissemination of results. By pursuing research that develops theoretical and experimental methods simultaneously, our group will help to erode some of the lingering, but artificial, barriers that traditionally divide theory and experiment. Outreach and education, in partnership with other academic institutions, industry and the national labs, will be promoted via the Southwest Quantum Information and Technology (SQuInT) Network. And, an effort to broaden the participation of underrepresented groups in science will proceed in conjunction with the New Mexico EPSCoR program in nanotechnology. Nanotechnology, where quantum mechanical effects can have a pronounced effect, has been identified for its potential to enhance the New Mexico economy; this program contributes toward that goal.