RAISE: TAQS: Engineering high quality, practical qubits in diamond

半导体中的色心，如钻石，已经成为实现可扩展量子技术（量子计算机和量子互联网）的一个有前途的平台。然而，到目前为止，大多数结果都是不切实际的，在实验室中进行概念验证，并且依赖于超冷温度下的实验，由于系统效率低，实验时间长。为了实现真正的量子飞跃，这项研究将开发一种低噪声，高保真度和效率，实用和可扩展的量子技术，该技术在更友好的环境中运行，因此可能无处不在。拟议的研究将影响量子工程和设备，基础物理和材料科学。该跨学科团队由量子光学理论和实验，材料加工和纳米纤维，量子技术和优化光子学设计领域的世界领先专家组成。 该项目包括与研究相结合的教育和外联活动，PI已经启动，包括积极招募少数民族和妇女从事科学和工程职业，开发新课程，本科生研究和咨询，以及参与K-12学生和教师的外联计划。技术说明本项目的重点是工程高质量，实用的量子比特的基础上的钻石色心与反转对称（硅，锗，锡空缺），这是更强大的环境比他们的非对称对应（如氮空缺）。这项工作将集中在工程高质量的量子位与优良的光学接口，其中应变，以及光学和声学声子态密度将通过制造方法（如应力源的沉积，退火）和结构几何形状局部控制。目标是提高量子效率，并在高温下（可能高达~ 77 K）实现长相干时间。此外，光子优化方法将用于提高量子电路的效率，并提高芯片上功能性光学互连量子器件的产量。该奖项反映了NSF的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

Color centers in semiconductors, such as diamond, have emerged as a promising platform for implementation of scalable quantum technologies (quantum computers and quantum internet). However, most of the results so far are impractical, proof-of-concept demonstrations in laboratories, and rely on experiments at ultracold temperature, with long experiment times resulting from poor system efficiencies. In order to enable a true quantum leap, this research will develop a low noise, high fidelity and efficiency, practical and scalable quantum technology which operates in friendlier environments and could thus be ubiquitous. The proposed research will impact quantum engineering and devices, fundamental physics, and materials science. The interdisciplinary team consists of world leading experts in the areas of quantum optics theory and experiment, materials processing and nanofabrication, quantum technologies, and optimized photonics design. The project includes educational and outreach activities integrated with research, which the PIs have already initiated, including active recruitment of minorities and women for science and engineering careers, development of new classes, undergraduate research and advising, and participation in outreach programs for K-12 students and teachers. Technical descriptionThis project is focused on engineering high quality, practical qubits based on diamond color centers with inversion symmetry (Si, Ge, and Sn vacancy) which are more robust to their environment than their non-symmetric counterparts (such as nitrogen vacancy). The effort will be focused on engineering high quality qubits with excellent optical interfaces, where strain, as well as optical and acoustic phonon density of states will be locally controlled by fabrication methods (such as deposition of stressors, annealing) and by structure geometry. The goal is to increase quantum efficiency and enable long coherence times at elevated temperatures (potentially up to ~77K). In addition, photonic optimization methods will be used to increase efficiency of quantum circuits and to increase the yield of functional, optically interconnected quantum devices on chip. The proposed effort has the potential to revolutionize the field of quantum engineering and cavity QED by enabling scalable experiments in friendlier environments.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.