Taming Quantum Many-Body Systems for Quantum Information

在作为信息社会的现代生活中，像计算机这样的信息处理设备已经变得无处不在并且不可或缺。一个新的有前途的范例，称为量子信息处理（QIP），使用微观量子态来编码信息，并利用违反直觉的量子效应，如叠加和称为纠缠的量子相关，以实现对传统设备的大幅改进。随着QIP的概念开始在量子多体物理学中得到更多的重视，当大自然展示出对我们的技术有用的各种奇异的宏观物理现象时，它对量子信息的处理比我们想象的要好。在这个项目中，我们将研究如何有效地利用量子多体系统的内在复杂性来推进和扩大QIP。强关联的量子多体系统，如受抑量子磁体，被探索为可从大规模QIP获得纠缠的潜在资源。该理论研究项目将在量子信息学和量子多体物理学的交叉前沿领域相互促进，并为更大规模的量子模拟和量子计算铺平道路。该研究将有助于建立量子信息科学的知识基础，并有助于培养这一高度交叉学科领域的未来科学家。学生将参与该项目的各个方面，包括教育，研究和成果的传播。该项目拓宽了NSF资助的量子信息与控制中心（CQuIC）目前的研究范围，大大扩展了与量子多体物理学的接口。视频会议被用来让CQuIC合作伙伴参与CQuIC的定期活动，包括每周的小组会议和研究研讨会。所有学生和高级人员将积极参与西南量子信息技术（SQuInT）网络，包括年度研讨会。在其15年的历史中，SQuInT为QIP的思想和成果交流提供了一个充满活力的途径，特别强调博士生，博士后和该领域的新研究人员。

Information processing devices, like computers, have become ubiquitous and indispensable in our modern life as an information society. A new promising paradigm, called quantum information processing (QIP), uses microscopic quantum states to encode information, and harnesses counterintuitive quantum effects such as superposition and quantum correlation called entanglement to attain drastic improvements over conventional devices. As the concepts from QIP start to be appreciated more in quantum many-body physics, it becomes clearer that nature handles quantum information better than we have imagined when it exhibits various exotic macroscopic physical phenomena useful in our technology. In this project we will study how effectively the intrinsic complexity of quantum many-body systems can be harnessed for the advancement and scaling-up of QIP. Strongly-correlated quantum many-body systems, like frustrated quantum magnets, are explored as potential resources for entanglement available from large-scale QIP. This theoretical project is expected to cross-fertilize QIP and quantum many-body physics at their newly intersecting frontiers, and to help pave the way to larger scale quantum simulation and quantum computation.The research will contribute to the knowledge base of quantum information science, and to the training of future scientists in this highly interdisciplinary field. Students will be involved in all aspects of the project, including education, research, and the dissemination of results. The project broadens the current research spectrum of the NSF-funded Center for Quantum Information and Control (CQuIC) significantly towards the interface with quantum many-body physics. Video conferencing is used to allow participation of CQuIC partners in the regular activities of CQuIC, including weekly group meetings and research seminars. All students and senior personnel will actively participate in the Southwest Quantum Information Technology (SQuInT) network, including the annual workshop. During its 15-year history SQuInT has provided a vibrant avenue for exchange of ideas and results in QIP, with particular emphasis given to PhD students, postdocs, and new researchers in the field.