Collaborative Research: Quantum acoustics for optomechanical transduction and entanglement of solid-state spin qubits

合作研究：用于光机械传导和固态自旋量子位纠缠的量子声学

• 批准号: 2006103
• 负责人: Mo Li
• 金额: $ 46.23万
• 依托单位: University of Washington
• 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: 2020-05-01 至 2023-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2006103&HistoricalAwards=false
• 关键词: Collaborative; Research; Quantum; acoustics; optomechanical

Future quantum computers will need to utilize different physical types of qubits that need to communicate and convert between each other with high fidelity and high efficiency. While photons are ideal for quantum communication, different qubit systems couple to photons of vastly different frequency ranges. The strain field generated by the mechanical wave in a solid-state material is a promising approach to enable coupling with a broad range of qubits with theoretically high efficiency. With a traveling velocity of five orders of magnitude lower than photons, acoustic waves are ideal for quantum interconnect between multiple qubits. The quantum acoustic technology developed in this project and the integration with NV-defect center qubits is an essential first step toward a chip-scale hybrid, multiple qubit systems. The proposed research both addresses the imminent issue of frequency inhomogeneity that has been plaguing solid-state optical qubits and explores the frontier of strong coupling of mechanical modes with spin qubits. The project will make significant advances from previous studies of discrete systems to realizing a monolithic quantum system that includes waveguides, optical and acoustic cavities, and acoustic transducers to directly interface with qubits, all integrated on a novel material platform. The approach offers a path to the realization of the integrated quantum computing system based on hybrid solid-state qubits interconnected with photons and phonons. The research leverages the tremendous technological development in the acoustic MEMS technology and advances it to the quantum regime, with the potential outcome that can impact both quantum information science and microwave photonics for classical communication. Education and outreach activities aim to increase the participation of students from underrepresented groups and improve the diversity of the STEM workforce and include course development in advanced quantum computing and K-12 science outreach programs with publicly accessible online courses. Technical Abstract:The project aims to develop a novel integrated quantum acoustic device platform for optomechanical transduction and quantum state manipulation of solid-state spin qubits based on defect centers in diamond. The integrated devices will be built on the high-performance heterogeneous material platform of gallium phosphide (GaP) on the crystalline diamond. The platform uniquely utilizes the layer of piezoelectric GaP for the dual functions of optical waveguiding and acoustic wave generation and guiding, thereby to achieve tremendously enhanced acousto-optic interaction. The effort will include three main thrusts. The first thrust will realize integrated acousto-optic frequency shifter (AOFS) to address the optical frequency inhomogeneity problem of qubits based on defect centers. AOFS can achieve single-sideband, carrier-suppressed frequency shift of photons from qubits freely over a range of ±3GHz and with an efficiency better than 80%. The second thrust will investigate the coupling of itinerant acoustic waves to ensembles and single defect centers. The acoustic coupling strength will be enhanced to reach the strong coupling regime and realize time-dependent control over the states of the qubits. The final thrust will realize the strong coupling of acoustic modes confined in a high-Q cavity with single defect centers embedded therein. Quantum state manipulation and quantum entanglement of the qubits by utilizing the acoustic mode will be achieved. Ensembles of NV-centers coupled to the cavity acoustic mode in the strong-coupling regime and novel physics effects in this regime will be explored.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.

未来的量子计算机将需要利用不同物理类型的量子比特，这些量子比特需要以高保真和高效率相互通信和转换。虽然光子是量子通信的理想选择，但不同的量子比特系统耦合到频率范围非常不同的光子。固体材料中机械波产生的应变场是一种很有前途的方法，可以在理论上高效率地与大范围的量子比特耦合。声波的传播速度比光子低五个数量级，是多个量子比特之间量子互连的理想选择。在该项目中开发的量子声学技术以及与NV缺陷中心量子比特的集成是迈向芯片规模混合多量子比特系统的关键的第一步。这项拟议的研究既解决了困扰固态光学量子比特的迫在眉睫的频率不均匀问题，又探索了机械模与自旋量子比特强耦合的前沿。该项目将从以前对离散系统的研究取得重大进展，实现一个单片量子系统，其中包括波导、光学和声学腔，以及直接与量子比特对接的声波换能器，所有这些都集成在一个新的材料平台上。这种方法为实现基于光子和声子互连的混合固态量子比特的集成量子计算系统提供了一条途径。这项研究利用了声学MEMS技术的巨大发展，并将其推进到量子领域，潜在的结果可能会对经典通信的量子信息科学和微波光子学产生影响。教育和外展活动旨在增加来自代表性不足群体的学生的参与，改善STEM劳动力的多样性，并包括高级量子计算和K-12科学外展计划的课程开发，以及可公开访问的在线课程。技术摘要：该项目旨在开发一种新型的集成量子声学装置平台，用于基于钻石中缺陷中心的固态自旋量子比特的光机械转换和量子态操纵。集成器件将建立在水晶钻石上的高性能磷化镓(GAP)异质材料平台上。该平台独特地利用了压电隙的层来实现光波导和声波产生和引导的双重功能，从而实现了极大地增强声光相互作用。这一努力将包括三个主要方面。第一个推力将实现集成声光移频器(AOFS)，以解决基于缺陷中心的量子比特的光学频率不均匀问题。AOFS可以在±3 GHz的范围内自由地实现量子比特的单边带、载波抑制的光子频移，效率优于80%。第二个推力将研究巡回声波与系综和单个缺陷中心的耦合。声耦合强度将增强到强耦合区域，实现对量子比特状态的随时间变化的控制。最终的推力将实现单个缺陷中心嵌入的高Q腔内声模的强耦合。利用声学模式实现量子比特的量子态操纵和量子纠缠。将探索在强耦合区域中NV中心与腔声学模式耦合的集合以及在该区域中的新的物理效应。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势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

Tunable phononic coupling in excitonic quantum emitters

• DOI: 10.1038/s41565-023-01410-6
• 发表时间: 2023-06-01
• 期刊: NATURE NANOTECHNOLOGY
• 影响因子: 38.3
• 作者: Ripin，Adina;Peng，Ruoming;Li，Mo
• 通讯作者: Li，Mo