CAREER: Quantum Coherence, Optical Readout, and Quantum Transduction for Spin Qubits from First-Principles Calculations

职业：基于第一原理计算的自旋量子位的量子相干性、光学读出和量子传导

• 批准号: 2143233
• 负责人: Yuan Ping
• 金额: $ 55.53万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-07-01 至 2023-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2143233&HistoricalAwards=false
• 关键词: CAREER; Quantum; Coherence; Optical; Readout

NONTECHNICAL SUMMARYThis award supports research and education to develop computational methods to investigate properties of smallest computation units – quantum bits that are important for storing and manipulating data in quantum computers. These quantum bits (qubits) have a spin state, an angular momentum that is a quantum mechanical property of an elementary particle, such as an electron, as their basic element. Characterizations and study of these building blocks help in determining how to make quantum computers dependable and scalable. The PI will develop computational tools to understand critical properties of different materials and their qubits. These properties include their ability to support complex computer applications (quantum coherence), to read high-fidelity information (quantum readout) and to transfer information efficiently (quantum transduction). Modelling these properties of different materials will help in predicting how they will behave in different conditions (for example, different temperatures) before performing experiments to observe their behavior. Methods developed in this project will accelerate discovery of materials that show promise for scalable quantum computing.The education and outreach plan includes strengthening undergraduate education on physical chemistry through summer bootcamp and developing computational materials research through new courses and REU programs, and supporting women and underrepresented groups through organizing coffee hours and seminars through UCSC WiSE program.TECHNICAL SUMMARYThe overarching goal of this project is to develop first-principles computational platforms to study critical physics processes in quantum information science (QIS) - quantum coherence, readout, and transduction of spin qubits. Understanding kinetics of excited states and spin qubit relaxation and decoherence is the core issue of spin-based QIS. Quantum coherence determines how long the spin state will last or the information will be intact; qubit readout efficiency determines if one can extract information from qubit with high fidelity; quantum transduction determines if quantum information can be transferred and communicated among qubits over a long range. All these properties are materials-specific, and have been mostly computed by simplified models which require prior inputs from experiments. In this project the PI aims to develop a fully first-principles computational platform to tackle these issues for spin qubits, which do not require prior input parameters.The general approach is to leverage the ab-initio density-matrix dynamics framework for open quantum systems that the PI has developed to resolve environmental couplings, have predictive capabilities for quantum relaxation and coherence time of spin qubit, as well as spin qubit initialization and readout efficiency through spin-photon interface. The latter will incorporate inputs of radiative, nonradiative and intersystem-crossing rates including many-body interactions. Accurate predictions of these physical parameters from first-principles will eliminate the need for prior input parameters or simplified models for general systems and open the path for designing novel quantum materials, such as new spin-defects and qubit network, which will create unprecedented performance for applications in quantum information science. The education and outreach plan include strengthening undergraduate education on physical chemistry through summer bootcamp and developing computational materials research through new courses and REU programs, and supporting women and underrepresented groups through organizing coffee hours and seminars through UCSC WiSE program.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.

非技术摘要这一奖项支持研究和教育，以开发计算方法来研究最小的计算单元的属性 - 量子位对于存储和操纵量子计算机中的数据很重要。这些量子位（Qubits）具有旋转状态，一种角动量，是基本粒子（例如电子）作为基本元素的量子机械性能。对这些构件的表征和研究有助于确定如何使量子计算机可靠和可扩展。 PI将开发计算工具，以了解不同材料的关键特性及其数量。这些属性包括它们支持复杂计算机应用程序（量子相干），读取高保真信息（量子读数）并有效传输信息（量子传输）的能力。对不同材料的这些特性进行建模将有助于预测它们在执行实验之前观察其行为之前在不同条件（例如不同温度）的行为。 Methods developed in this project will accelerate discovery of materials that show promise for scalable quantum computing.The education and outreach plans include strengthening undergraduate education on physical chemistry through summer bootcamp and developing computational materials research through new courses and REU programs, and supporting women and underrepresented groups through organizing coffee hours and sewers through UCSC WiSE program.TECHNICAL SUMMARYThe overarching goal of this project is to develop first-principles computational platforms研究量子信息科学（QIS）中的关键物理过程 - 量子相干性，读数和旋转量的转移。了解激发态的动力学和自旋数量松弛和破坏性是基于自旋的QI的核心问题。量子相干确定旋转状态将持续多长时间或信息完整；量子读数效率确定是否可以从高保真度中提取Qubit信息；量子转移确定是否可以在远距离范围内传输和传达量子信息。所有这些属性都是特定于材料的，并且主要是由简化的模型计算的，这些模型需要实验中的先前输入。 In this project the PI aims to develop a fully first-principles computational platform to tackle these issues for spin qubits, which do not require prior input parameters.The general approach is to leverage the ab-initio density-matrix dynamics framework for open quantum systems that the PI has developed to resolve environmental couplings, have predictive capabilities for quantum relaxation and coherence time of spin qubit, as well as spin qubit initialization and readout通过自旋光子接口效率。后来的将结合辐射，非辐射性和系统间交叉的输入，包括多体相互作用。对这些物理参数的准确预测将消除对通用系统的先前输入参数或简化模型的需求，并为设计新型量子材料（例如新的Spin-Defects和Quantum Network）开辟了道路，这将在量子信息科学中为应用创造前所未有的性能。 The education and outreach plan include strengthening Undergraduate education on physical chemistry through summer bootcamp and developing computational materials research through new courses and REU programs, and supporting women and underrepresented groups through organizing coffee hours and semiars through UCSC WiSE program.This award reflects NSF's statutory mission and has been deemed precious of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

项目成果

Effect of environmental screening and strain on optoelectronic properties of two-dimensional quantum defects

• DOI: 10.1088/2053-1583/acddf6
• 发表时间: 2023-04
• 期刊: 2D Materials
• 影响因子: 5.5
• 作者: Shiminm Zhang;Kejun Li;Chunhao Guo;Y. Ping