CAREER: A 'holistic' approach toward scalable quantum optical networks in semiconductors

在这项工作中，我们研究了一种新的量子比特系统，用于实现光连接量子网络：III-V量子阱（QW）中的单受体结合孔（A0）。该系统具有将毫秒级的自旋相干时间与纳米材料中强、均匀的光学跃迁相结合的潜力。为了分离单杂质束缚激子（A0X），远场超分辨率光学技术将得到发展，其目标是达到有效质量玻尔半径数量级的光学分辨率。这些技术将与超快光自旋控制相结合，研究量子阱约束和附近表面对A0-A0X系统光学和自旋相干性的影响。从这些研究中获得的知识将指导将单一杂质整合到光学纳米腔中的研究。该项目的长期目标是在可扩展架构中实现光连接的少量量子比特设备。基于光子和自旋的量子信息网络将实现量子模拟、安全的远距离量子通信和量子计算。在这项工作中，我们研究了半导体中的单一杂质作为这种网络的潜在量子比特。纳米低温成像技术将用于分离单一杂质。超快光学技术将用于杂质量子比特寿命的研究。该项目的长期目标是实现几个量子位网络，其中自旋通过片上光学器件连接。该研究项目将涉及、教授和培训实验物理、量子光学和纳米科学方面的本科生、研究生和博士后。除了培养量子光学、物理学和纳米技术方面的本科生、研究生和博士后外，该项目还包括在当地一所小学开展社区推广活动。华盛顿大学物理和电气工程专业的学生与一名Sansislo小学的科学老师密切合作，让4 -5年级的学生参加每周一次的科学活动，旨在了解光。

In this work we investigate a new qubit system ideal for realizing an optically connected quantum network: single acceptor-bound holes (A0) in III-V quantum wells (QW). This system has the potential to combine millisecond long spin coherence times with strong, homogeneous optical transitions in a nanofabrication-ready material. Far-field super-resolution optical techniques will be developed in order to isolate single impurity-bound excitons (A0X), with the goal of reaching optical resolutions on the order of the effective mass Bohr radius. These techniques will be combined with ultrafast optical spin control to study the effect of QW confinement and nearby surfaces on the optical and spin coherence properties of the A0-A0X system. Knowledge gained from these studies will guide research on integrating single impurities into optical nanocavities. The longer term goal of the project is to realize optically-connected few qubit devices in a scalable architecture. A quantum information network based on photons and spins would enable quantum simulation, secure long-distance quantum communication, and quantum computation. In this work we study single impurities in semiconductors as potential quantum bits for such a network. Nanoscale low temperature imaging techniques will be developed to isolate single impurities. Ultrafast optical techniques will be used to study the impurity qubit lifetime. The longer term goal of the project is to realize a few qubit network in which spins are connected through on-chip optical devices. The research program will involve, teach, and train undergraduates, graduate students, and postdoctoral associates in experimental physics, quantum optics, and nanoscience. In addition to training undergraduate students, graduate students and postdocs in quantum optics, physics and nanotechnology, an integral part of the broader impact of this program includes community outreach at a local elementary school. University of Washington physics and electrical engineering students, working closely with a Sansislo elementary school science teacher, are engaging 4th-5th grade students in weekly science activites aimed at understanding light.