ExpandQISE: Track 1: Energy Efficient Quantum Control of Robust Spin Ensemble Qubits (EQ2)

ExpandQISE：轨道 1：鲁棒自旋系综量子位的节能量子控制 (EQ2)

• 批准号: 2231356
• 负责人: Jayasimha Atulasimha
• 金额: $ 80万
• 依托单位: Virginia Commonwealth University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-09-01 至 2025-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2231356&HistoricalAwards=false
• 关键词: ExpandQISE; Track; Energy; Efficient; Quantum

Non-technical Description:An important problem in scalable quantum computing is to locally address qubits in an energy-efficient manner. Current approaches, for example, use microwaves at different frequencies conveyed through waveguides to address different qubits that are resonant to different frequencies. Such microwave fields consume significant energy and their confinement to the nanometer scale is challenging. This project will use voltage-control of nanoscale magnets for energy efficient and selective addressing of spin qubits with high spatial resolution and will be easy to integrate with existing foundry manufacturing processes. Thus, this project will synergistically bring together the fields of spintronics and quantum computing. The project team will create a vibrant Quantum Information Science and Engineering (QISE) program at Virginia Commonwealth University (VCU) and integrate this research with teaching and outreach to educate students in QISE at the graduate, undergraduate, and K-12 levels while leveraging existing QISE expertise at the University of California, Los Angeles (UCLA) through collaboration. Such activities include developing a new QISE course, lab modules, and K-12 outreach through workshops and summer internships for underrepresented students in QISE. Technical Description:This project will simulate and demonstrate highly localized control of qubits using nanomagnets driven by an electric field at the Larmor frequency of proximally located spin qubits to implement single-qubit quantum gates with state-of-the-art fidelities and high energy efficiency. Towards realizing the above research vision, the project will (1) simulate and experimentally demonstrate voltage control of nanoscale magnets using heterostructures to generate the desired magnetic field pulses locally in a confined nanoscale volume for high fidelity single spin qubit gates, (2) demonstrate that the voltage-controlled magnetization dynamics of such nanomagnets can control NV spin qubit centers in diamond with high fidelity that can be read optically, and (3) simulate the collective dynamics of mesoscopic spin ensembles comprising 10-100 spins (for an increased signal to noise ratio and possibly error correction through spin interaction to reduce dephasing) and demonstrate that voltage-controlled nanomagnets can control such an ensemble of spins with high fidelity.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.

非技术描述：可伸缩量子计算中的一个重要问题是以节能方式局部解决Qubits。例如，当前的方法在通过波导传达的不同频率下使用微波来解决与不同频率共鸣的不同量子。这样的微波场消耗了重要的能量，并且将其限制到纳米量表非常具有挑战性。该项目将使用纳米级磁铁的电压控制来节能和选择性地解决具有高空间分辨率的自旋量子，并且很容易与现有的铸造厂制造工艺集成。因此，该项目将协同结合使用旋转和量子计算的领域。该项目团队将在弗吉尼亚联邦大学（VCU）创建一个充满活力的量子信息科学与工程（QISE）计划，并将这项研究与教学和宣传相结合，以通过合作，在加利福尼亚大学（UCLA）的加利福尼亚大学（UCLA）的现有QISE专业知识中，在研究生，本科和K-12水平上教育学生。此类活动包括通过研讨会和夏季实习，为Qise的代表性不足的学生开发新的QISE课程，实验室模块和K-12外展活动。技术描述：该项目将使用由电场驱动的纳米磁体模拟和演示对Qubits的高度局部控制，该纳米磁体以近端的旋转量子的Larmor频率驱动，以实现具有最先进的保真度和高能量效率的单量子量子门。 为了实现上述研究视觉，该项目将（1）模拟和实验证明使用异质结构对纳米级磁体的电压控制，以生成所需的磁场脉冲局部，以高保真单旋转量子闸门的高纳米级量，（2）表明，二元组可以控制这种高磁化量，以控制电压控制的磁性旋转量。可以在光学上读取，以及（3）模拟包括10-100次旋转的介质旋转组合的集体动力学（以增加信号比率增加信号比率，并可能通过旋转相互作用纠正误差以减少dephasing），并证明电压控制的纳米磁体可以控制高度的范围。通过使用基金会的智力优点和更广泛影响的评论标准进行评估。

项目成果

Quantum control of spin qubits using nanomagnets

• DOI: 10.1038/s42005-022-01041-8
• 发表时间: 2022-03
• 期刊: Communications Physics
• 影响因子: 5.5
• 作者: Mohamad Niknam;M. F. Chowdhury;M. Rajib;W. A. Misba;R. Schwartz;Kang L. Wang;J. Atulasimha;L. Bouc