Taming Quantum Many-Body Systems for Quantum Information

作为一个信息社会，信息处理设备，如计算机，在我们的现代生活中已经无处不在，不可或缺。一种新的有前途的范式，称为量子信息处理（QIP），使用微观量子态来编码信息，并利用反直觉的量子效应，如叠加和量子相关，称为纠缠，以获得比传统设备的巨大改进。随着量子量子ip的概念开始在量子多体物理学中得到更多的理解，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，它比我们想象的更好地处理量子信息，这一点变得越来越清楚。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量子量子ip。强相关的量子多体系统，如受挫的量子磁体，被探索为大规模量子量子ip中可用的纠缠的潜在资源。该理论项目有望在QIP和量子多体物理的新交叉领域相互促进，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库，并有助于培养这一高度跨学科领域的未来科学家。学生将参与项目的各个方面，包括教育、研究和成果的传播。该项目拓宽了美国国家科学基金会资助的量子信息与控制中心（CQuIC）目前在量子多体物理界面方面的研究范围。视频会议用于让CQuIC的合作伙伴参与CQuIC的日常活动，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领域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.