CAREER: Characterization of quantum dot qubits by scannable mechanical resonator

职业：通过可扫描机械谐振器表征量子点量子位

• 批准号: 2044920
• 负责人: Yoichi Miyahara
• 金额: $ 50.31万
• 依托单位: Texas State University - San Marcos
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-02-01 至 2026-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2044920&HistoricalAwards=false
• 关键词: CAREER; Characterization; quantum; dot; qubits

Non-technical abstract:In order to speed up the realization of the quantum technology for novel applications such as quantum computing, it is critical to carefully study new types of materials that can be used as quantum bits. This CAREER project pursues experimental techniques to study diverse nanometer-scale materials such as nanoparticles, nanowires and molecules for their potential use in making quantum bits at their individual level. The research adopts a scanning probe microscopy technique which employs a mechanical resonator to detect the motion of a single electron in these materials. The project lays the foundation of a new way of studying nanomaterials as quantum bits. The research activities are closely integrated with educational activities that include: 1) training graduate and undergraduate students at Texas State University and collaborating universities in applying state­-of-the art scanning probe microscopy based measurement techniques for material characterization and create a network of researchers, and 2) engaging a diverse student body at various levels including middle and high school in nano- and quantum-science through workshops with hands-on activities.Technical abstract:This CAREER project aims to investigate how a mechanical resonator can be used to characterize quantum mechanical properties of qubits realized in a double quantum dot such as tunnel coupling, relaxation and coherence, by adopting a mechanical charge sensing technique based on atomic force microscopy. The use of scannable probes makes it possible to characterize double quantum dots by positioning the probe above the target quantum dot, without integrating a resonator or sensing electrodes nearby. The outcome of this project will broaden the fundamental understanding of the coupling between mechanical resonators and qubits based on double quantum dots and will open the path for the study of a broad range of nanomaterials – nanoparticle complexes, nanowires, self­-assembled quantum dots and engineered molecules– that have not been investigated as qubits. These qubits could operate at much higher temperatures due to their higher confinement energy, enabling wider spread use of quantum technology. The project will support the training of graduate and undergraduate students in advanced cryogenic scanning probe microscopy instrumentation and nanofabrication.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.

非技术摘要：为了加快量子技术在量子计算等新应用中的实现，仔细研究可用作量子比特的新型材料至关重要。这个CAREER项目追求实验技术，以研究各种纳米尺度的材料，如纳米颗粒，纳米线和分子，以其在个人层面上制造量子比特的潜在用途。该研究采用了扫描探针显微镜技术，该技术采用机械谐振器来检测这些材料中单个电子的运动。该项目为研究纳米材料作为量子比特的新方法奠定了基础。研究活动与教育活动紧密结合，其中包括：1）在德克萨斯州立大学和合作大学培训研究生和本科生，应用最先进的基于扫描探针显微镜的测量技术进行材料表征，并创建研究人员网络，和2）通过讲习班和实践活动，让不同层次的学生参与纳米和量子科学，包括初中和高中。技术摘要：本CAREER项目旨在研究如何通过采用基于原子力显微镜的机械电荷传感技术，使用机械谐振器来表征在双量子点中实现的量子比特的量子力学特性，例如隧道耦合，弛豫和相干性。可扫描探针的使用使得可以通过将探针定位在目标量子点上方来表征双量子点，而无需在附近集成谐振器或感测电极。该项目的成果将拓宽对机械谐振器与基于双量子点的量子比特之间耦合的基本理解，并将为研究广泛的纳米材料-纳米颗粒复合物，纳米线，自组装量子点和工程分子-开辟道路。这些量子位可以在更高的温度下工作，因为它们具有更高的限制能量，从而能够更广泛地使用量子技术。该项目将支持研究生和本科生在先进的低温扫描探针显微镜仪器和nanofablets.This奖项的培训反映了NSF的法定使命，并已被认为是值得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的支持。