EAPSI: Modeling of Interactions Between Single Photons and Quantum Systems for On-Chip Quantum Information Transfer

量子信息网络依靠由单光子组成的光脉冲来传输信息，并依靠量子系统（如电子自旋）来处理这些信息。这项新技术为高度安全的量子通信网络打开了大门，并提高了计算效率。实现这些目标需要精确控制光和量子系统之间的相互作用。该奖项将研究一种独特的系统，通过结合控制晶体中的单个电子自旋和腔中的光子，从而实现可以在单个信息上操作的光开关。光交换机是量子网络中扩展通信范围的重要组成部分。该研究员将与中国北京大学微腔光子学领域的著名专家肖云峰博士密切合作。该合作提供了纳米制造以及量子科学和技术方面的理论工作和培训机会。本项目重点研究了一种特殊的腔QED系统，该系统通过共振拉曼跃迁将金刚石中带负电荷的氮空位（NV）中心耦合到微谐振器中光学模式的倏逝场。该系统具有光子和电子自旋之间强相干耦合的独特特性，这是创建可以控制单光子量子态的光子开关所必需的。这些开关可以实现量子纠缠的产生和分布。目标是为提出的腔QED系统建立一个完整的量子模型，然后可以扩展到多个NV中心的通用解决方案。实验组件将制造和表征不对称环形微谐振器，用于未来的实验。固态平台可以广泛影响量子网络和片上量子信息处理的发展。该奖项隶属于东亚和太平洋暑期研究所项目，由美国国家科学基金会和中国科技部共同资助，支持美国研究生的暑期研究。

Quantum information networks rely on light pulses comprised of single photons to transmit information and on quantum systems, such as electron spins, to process this information. This new technology opens the door to highly secure quantum communication networks and increased computational effi;ciency. Achieving these goals requires precise control of interactions between light and quantum systems. This award will investigate a unique system by combining control of individual electrons spins in a crystal and photons in a cavity, thus realizing an optical switch that can operate on single bits of information. Optical switches are an important component in quantum networks that can extend the range of communication. The researcher will work closely with Dr. Yun-Feng Xiao, a noted expert in micro-cavity photonics, at Peking University in Beijing, China. The collaboration provides access to theoretical work and training opportunities in nano fabrication as well as quantum science and technology.This project highlights a special cavity QED system that couples negatively charged nitrogen vacancy (NV) centers in diamond to the evanescent field of am optical mode in a microresonator via a resonant Raman Transition. This system can feature unique properties of strong coherent coupling between a photon and an electron spin, which are necessary to create photonic switches that can control the quantum state of single photons. These switches can enable the generation and distribution of quantum entanglement. The goal is to build a full quantum model for the proposed cavity QED system, which can then be scaled up to a general solution for multiple NV centers. The experimental component will fabricate and characterize asymmetric toroidal microresonators for use in future experiments. A solid-state platform can broadly impact the development of quantum networks and on-chip quantum information processing.This award under the East Asia and Pacific Summer Institutes program supports summer research by a U.S. graduate student and is jointly funded by NSF and the Ministry of Science and Technology of China.