An integrated photonic device in diamond to generate quantum entanglement, a computational resource for quantum information processing

摘要标题：一个集成的光子器件在钻石产生量子纠缠，计算资源的量子信息processingAbstract：Nontechnical描述：该项目旨在证明量子设备是一个重要的构建块在量子计算网络。该设备将在钻石中的两个电子自旋之间产生纠缠，这是一种计算资源。在自旋之间产生纠缠的主要挑战是与纠缠寿命相比快速执行操作。先前利用自由空间光学组件的金刚石实验实现了10-100毫赫兹范围内的产生速率。 在这里，我们寻求利用集成光子学来实现千赫兹速率。该材料平台包含内置于半导体磷化镓中的光波导层。该波导层连接由金刚石中的氮空位中心组成的量子节点。由超导材料氮化铌制成的第三个探测器层用于探测从氮空位中心发射的光子。 可扩展平台中的千赫兹纠缠速率将使大型量子网络得以实现。这些网络可以用来解决在经典计算机上无法解决的计算问题。参与研究的研究生和本科生将接受尖端光子和量子器件技术的设计，制造和测试方面的培训。此外，一个移动的，动手演示表，其中提出了材料科学的基本概念，通过基于钻石的活动，将开发和应用在华盛顿大学和西雅图范围内的科学推广events.Technical描述：原子类固态缺陷是有吸引力的候选人，可扩展的量子信息处理，由于这些缺陷的潜力集成到设备。然而，与调整这些缺陷的个体量子特性相关的挑战，以及控制缺陷之间的相互作用的困难，迄今为止已经阻止了可扩展的基于缺陷的量子网络的实现。 这项工作旨在展示一种量子设备，一种片上纠缠生成单元，预计将作为这种网络的基本构建模块。将利用一种新型的混合光子结构，其将磷化镓作为光学器件层与金刚石衬底集成，金刚石衬底承载氮空位量子信息节点。该装置利用光子干涉产生纠缠，这需要控制单个氮空位中心的光学性质。这种控制由与磷化镓层兼容的集成电极提供。磷化镓器件层能够有效地收集氮空位光子并将其路由到波导集成超导探测器，以实现千赫兹电子纠缠速率。

Abstract title: An integrated photonic device in diamond to generate quantum entanglement, a computational resource for quantum information processingAbstract:Nontechnial description:This project seeks to demonstrate a quantum device that is an essential building block in a quantum computing network. The device will generate entanglement, a computational resource, between two electron spins in diamond. The main challenge for generating entanglement between spins is performing the operation quickly compared to the entanglement lifetime. Prior experiments in diamond which utilized free-space optical components realized generation rates in the 10-100 millihertz regime. Here we seek to utilize integrated photonics to realize kilohertz rates. The materials platform contains an optical waveguiding layer built in the semiconductor gallium phosphide. This waveguiding layer connects quantum nodes composed of nitrogen-vacancy centers in diamond. A third detetor layer, made from the superconducting material niobium nitride, is used to detect the photons emitted from the nitrogen-vacancy centers. Kilohertz entanglement rates in a scalable platform will enable the realization of large quantum networks. These networks can be utilized to solve computational problems which cannot be solved on a classical computer. Graduate and undergraduates involved in the research will be trained in the design, fabrication, and testing of cutting edge photonic and quantum device technologies. Additionally, a mobile, hands-on demonstration table, which presents fundamental concepts of materials science through diamond-based activities, will be developed and employed at the University of Washington and Seattle-wide science outreach events.Technical description:Atomic-like solid-state defects are attractive candidates for scalable quantum information processing due to the potential to integrate these defects into devices. However, the challenges associated with tuning the individual quantum properties of these defects, as well as the difficulty in controlling interactions between defects, has thus far prohibited the realization of a scalable defect-based quantum network. This works seeks to demonstrate a quantum device, an on-chip entanglement generation unit, that is expected to serve as an essential building block for such a network. A novel, hybrid photonic structure will be utilized that integrates gallium phosphide as an optical device layer with a diamond substrate which hosts the nitrogen-vacancy quantum information nodes. The device utilizes photon interference to generate entanglement, which requires control of the optical properties of individual nitrogen-vacancy centers. This control is provided by integrated electrodes compatible with the gallium phosphide layer. The gallium phosphide device layer enables efficient collection and routing of nitrogen-vacancy photons to waveguide-integrated superconducting detectors to achieve kilohertz electron entanglement rates.