Mechanically Mediated Spin Entanglement in Diamond

金刚石中机械介导的自旋纠缠

• 批准号: 2012524
• 负责人: Hailin Wang
• 金额: $ 45万
• 依托单位: University of Oregon Eugene
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-08-01 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2012524&HistoricalAwards=false
• 关键词: Mechanically; Mediated; Spin; Entanglement; Diamond

Diamonds consist of a regular arrangement, or lattice, of carbon atoms, which often contains defects at the atomic level. Common defects include impurities, such as nitrogen or silicon atoms, and vacancies - places in the lattice where atoms are missing. A special defect is a “silicon-vacancy” center, which consists of two vacancies that are adjacent to each other, with a silicon atom inserted in between. An electron can be trapped around such a defect, and used as a “qubit,” or “quantum bit”—a fundamental unit of quantum information. An outstanding challenge for using these qubits to develop solid-state quantum computers is the precise control of the interactions between them. This program will develop an experimental approach that uses mechanical vibrations in an ultrathin diamond film to mediate interactions between two silicon-vacancy qubits. Mechanical waves can be conveniently confined and guided in a suitably designed solid-state nanostructure with negligible loss, opening up a new frontier in the development of quantum information technologies. In addition, this program will also make contributions to education and human resources by providing excellent training to graduate and undergraduate students in areas of both scientific and technological importance.This experimental program focuses on mechanically mediated coupling between electron spins in a diamond nanomechanical resonator, with the long-term goal of establishing a trapped-ion-like solid-state platform for quantum computing. The primary building block of this platform is a diamond Lamb wave mechanical resonator, in which electron spins in silicon vacancy centers couple to a symmetric mechanical compression mode. The Lamb wave resonator is protected by a phononic crystal lattice, which can enable the achievement of mechanical Q-factors limited only by the intrinsic material loss of diamond. Two mechanisms that take advantage of the special energy level structure of silicon vacancy centers will be explored for the coupling between spins and mechanical vibrations. One exploits optically driven sideband spin transitions. The other uses mechanical vibrations to directly drive spin transitions. The sideband spin transitions will be used for spin entanglement through a Molmer-Sorensen two-qubit gate, which is widely used for trapped ions. The direct acoustic driving will be used for spin entanglement via a phononic cavity QED process.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.

钻石由碳原子的规则排列或晶格组成，而碳原子通常在原子水平上存在缺陷。常见的缺陷包括杂质，如氮原子或硅原子，以及晶格中原子缺失的空位。一种特殊的缺陷是“硅空位”中心，它由两个彼此相邻的空位组成，中间插入一个硅原子。一个电子可以被困在这样一个缺陷周围，并被用作“量子位”或“量子比特”——量子信息的基本单位。使用这些量子比特来开发固态量子计算机的一个突出挑战是精确控制它们之间的相互作用。该项目将开发一种实验方法，利用超薄金刚石薄膜中的机械振动来调解两个硅空位量子比特之间的相互作用。机械波可以方便地限制和引导在一个适当设计的固体纳米结构中，损耗可以忽略不计，为量子信息技术的发展开辟了一个新的前沿。此外，该计划还将通过在科学和技术重要领域为研究生和本科生提供优秀的培训，为教育和人力资源做出贡献。这个实验项目的重点是在金刚石纳米机械谐振器中电子自旋之间的机械介导耦合，其长期目标是建立一个类似于捕获离子的量子计算固态平台。该平台的主要组成部分是一个金刚石Lamb波机械谐振器，其中电子在硅空位中心自旋耦合到对称的机械压缩模式。Lamb波谐振器由声子晶格保护，可以实现仅受金刚石本征材料损耗限制的机械q因子。利用硅空位中心特殊的能级结构，探讨了自旋与机械振动耦合的两种机制。一种是利用光学驱动的边带自旋跃迁。另一种是利用机械振动直接驱动自旋转变。边带自旋跃迁将用于通过Molmer-Sorensen双量子比特门进行自旋纠缠，该门广泛用于捕获离子。直接声驱动将通过声子腔QED过程用于自旋纠缠。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Coupling spins to nanomechanical resonators: Toward quantum spin-mechanics

• DOI: 10.1063/5.0024001
• 发表时间: 2020-11
• 期刊: arXiv: Mesoscale and Nanoscale Physics
• 作者: Hailin Wang;I. Lekavicius

Mechanical Photoluminescence Excitation Spectra of a Strongly Driven Spin-Mechanical System

强驱动自旋机械系统的机械光致发光激发光谱

• DOI: 10.1103/physrevapplied.19.064068
• 发表时间: 2023
• 期刊: Physical Review Applied
• 影响因子: 4.6
• 作者: Li, Xinzhu;Wang, Hailin
• 通讯作者: Wang, Hailin

Diamond Nanomechanical Resonators Protected by a Phononic Band Gap

受声子带隙保护的金刚石纳米机械谐振器

• DOI: 10.1021/acs.nanolett.2c04095
• 发表时间: 2022
• 期刊: Nano Letters
• 影响因子: 10.8
• 作者: Li, Xinzhu;Lekavicius, Ignas;Wang, Hailin
• 通讯作者: Wang, Hailin