RUI: Clock Transitions, Coherence and Quantum Dynamics in Molecular Nanomagnets

RUI：分子纳米磁体中的时钟跃迁、相干性和量子动力学

• 批准号: 2207624
• 负责人: Jonathan Friedman
• 金额: $ 47.5万
• 依托单位: Amherst College
• 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: 2022-08-01 至 2025-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2207624&HistoricalAwards=false
• 关键词: RUI; Clock; Transitions; Coherence; Quantum

Non-Technical Abstract:The burgeoning field of quantum computation and quantum information relies on the ability to control the quantum states of qubits, the physical systems used for quantum information processing. Unlike classical bits, in which information is stored as zeros or ones, qubits can be put into quantum superpositions of zero and one states. In addition, qubits can be entangled with one another to create unique states that cannot be described as belonging to any individual qubit. Superposition and entanglement are the quantum underpinnings that give quantum computation its potential power, a power that is accompanied by a certain delicacy: the information stored and processed in a quantum computer can easily be disturbed by interactions with uncontrolled elements of the environment, such as fluctuating magnetic fields or vibrations. This project focuses on employing molecular nanomagnets as qubits and understanding and mitigating the environmental elements that affect the magnets’ ability to retain quantum information. So-called clock transitions can help isolate the magnets from the effects of fluctuating magnetic fields. In this research, microwave photons are used to control the magnetic states of these magnets and to measure how long quantum information can be stored in these systems, the coherence time. In the process of conducting this research, the team is investigating fundamental quantum properties of these magnets in the presence of microwave radiation. The research is being conducted at a primarily undergraduate institution with the participation of undergraduate student-scholars and graduate students. These researchers are all gaining valuable research skills that will further the development of their careers in scientific and related technical fields in academia and the rapidly growing commercial quantum information sector. Technical Abstract:The burgeoning field of quantum computing and quantum information requires qubits with long coherence times that are also easy to manipulate with external control parameters. This project focuses on employing molecular nanomagnets as qubits and understanding and mitigating the decoherence from environmental degrees of freedom. The molecular magnets studied in this project exhibit “clock transitions” that reduce the decohering effects of fluctuating magnetic fields. Using pulse electron-spin resonance techniques, the quantum states of these molecules are controlled, and their coherence times are measured. Mechanisms of decoherence are investigated by comparing the coherence times at clock transitions with those measured when the system is tuned away from clock transitions. In addition, the researchers are exploring various pulse schemes to dynamically decouple the magnets from decohering environmental fluctuations. Pulsed microwave radiation is also being employed to investigate using an ensemble of molecular magnets as a medium for the holographic storage of quantum information. In the process of conducting this research, the team is investigating fundamental quantum properties of these magnets when coupled to a microwave radiation field. The research is being conducted at a primarily undergraduate institution with the participation of undergraduate student-scholars and graduate students. These researchers are all gaining valuable research skills that will further the development of their careers in scientific and technical fields.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：量子计算和量子信息的冲水场依赖于控制量子状态的量子状态的能力，即用于量子信息处理的物理系统。与经典位以零或零的位存储的经典位不同，可以将量子放入零和一种状态的量子叠加中。另外，量子位可以彼此纠缠以创建无法描述为属于任何个人定量的独特状态。叠加和纠缠是给量子计算的量子基础，这些基础具有量子计算的潜在能力，该功能伴随着某个检测器：在量子计算机中存储和处理的信息很容易通过与环境不受控制的元素的相互作用（例如波动磁场或振动）的相互作用而变形。该项目着重于采用分子纳米磁铁作为量化，理解和减轻影响磁体保留量子信息能力的环境元素。所谓的时钟过渡可以帮助将磁铁从波动磁场的影响中隔离开来。在这项研究中，微波照片用于控制这些磁铁的磁态，并测量可以在这些系统中存储多长时间的量子信息，即相干时间。在进行这项研究的过程中，该团队正在研究微波辐射的情况下这些磁铁的基本量子特性。这项研究是在小学的本科机构进行的，并参加了本科生 - 学院和研究生的参与。这些研究人员都获得了宝贵的研究技能，这将进一步发展学术界和迅速发展的商业量子信息领域的科学和相关技术领域的职业发展。技术摘要：量子计算和量子信息的Brugeoning字段需要具有较长连贯时间的配额，并且使用外部控制参数也很容易操纵。该项目侧重于采用分子纳米磁铁作为数量，理解和减轻自由度的破裂。该项目中研究的分子磁铁显示出“时钟跃迁”，从而减少了波动磁场的变质作用。使用脉冲电子自旋共振技术，控制了这些分子的量子状态，并测量它们的相干时间。通过将时钟过渡时的相干时间与系统从时钟过渡调节时测量的相干时间进行比较，可以研究破坏的机制。此外，研究人员正在探索各种脉搏方案，以动态地使磁体与磨刀的环境波动脱离。脉冲微波辐射也被聘请使用分子磁体集合作为量子信息全息存储的介质进行研究。在进行这项研究的过程中，当耦合到微波辐射场时，团队正在研究这些磁体的基本量子性能。这项研究是在小学的本科机构进行的，并参加了本科生 - 学院和研究生的参与。这些研究人员都在获得价值研究技能，将进一步发展其科学和技术领域的职业。该奖项反映了NSF的法定任务，并通过使用基金会的知识分子优点和更广泛的影响评估标准来评估，认为NSF的法定任务是宝贵的。