CAREER: Macroscopic Quantum Phenomena in Nanomagnets and SQUIDs

职业：纳米磁体和 SQUID 中的宏观量子现象

• 批准号: 0449516
• 负责人: Jonathan Friedman
• 金额: --
• 依托单位: Amherst College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-01 至 2011-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0449516&HistoricalAwards=false
• 关键词: CAREER; Macroscopic; Quantum; Phenomena; Nanomagnets

Where the frontier between the quantum and classical worlds lies and what defines the border are some of the most fundamental questions in physics. This Faculty Early Career Development (CAREER) project concentrates on low-temperature studies of single-molecule magnets and SQUIDs. Both of these systems are known to exhibit quantum properties such as tunneling on the mesoscopic/macroscopic scale. In this project, new experiments will endeavor to control these quantum properties and explore how environmental degrees of freedom lead to decoherence of the quantum state. Experiments on single-molecule magnets will focus on controlling the tunneling process using an applied transverse field or uniaxial stress. In SQUIDs, experiments will look for the Aharonov-Casher effect, in which tunneling can be modulated with an induced charge, a uniquely quantum effect. In addition, how the SQUID's quantum state decoheres will be studied by using a controlled ohmic environment. A new mechanism of decoherence due to angular momentum conservation will be investigated. All of these projects will be performed at Amherst College with undergraduate student participation. Research will also involve collaborations with faculty and students at the University of Massachusetts - Amherst. The educational aspect of this project involves the revamping of the physics curriculum at Amherst College. To this end, a new intermediate laboratory course emphasizing hands-on experience in modern physics experiments will be developed. Furthermore, an advanced laboratory elective course will be introduced to give students experience in a research-style environment. Where the frontier between the quantum and classical worlds lies and what defines the border are some of the most fundamental questions in physics and are of utmost importance to the development of practical quantum computers. This Faculty Early Career Development (CAREER) project concentrates on low-temperature studies of single-molecule magnets and superconducting devices to understand how these systems lose their "quantumness" through interactions with their respective environments. Experiments will focus on controlling how these systems change their quantum states and by engineering the environment with which they interact. How their quantum behavior is altered by a controlled environment will shed light on the nature of the quantum-classical frontier. All of these projects will be performed at Amherst College with undergraduate student participation. Research will also involve collaborations with faculty and students at the University of Massachusetts - Amherst. The educational aspect of this project involves the revamping of the physics curriculum at Amherst College. To this end, a new intermediate laboratory course emphasizing hands-on experience in modern physics experiments will be developed. Furthermore, an advanced laboratory elective course will be introduced to give students experience in a research-style environment.

量子世界和经典世界之间的边界在哪里，以及边界的定义是物理学中一些最基本的问题。 这个教师早期职业发展（CAREER）项目专注于单分子磁体和SQUID的低温研究。 已知这两种系统都表现出量子特性，例如介观/宏观尺度上的隧穿。 在这个项目中，新的实验将奋进控制这些量子特性，并探索环境自由度如何导致量子态的退相干。 单分子磁体的实验将集中在使用施加的横向场或单轴应力来控制隧穿过程。 在SQUID中，实验将寻找Aharonov-Casher效应，其中隧道可以用感应电荷调制，这是一种独特的量子效应。此外，如何SQUID的量子态消球差将通过使用一个受控的欧姆环境进行研究。 本文将研究由于角动量守恒引起的退相干的一种新机制。 所有这些项目将在阿默斯特学院进行，本科生参与。 研究还将涉及与马萨诸塞州大学阿默斯特分校的师生合作。该项目的教育方面涉及阿默斯特学院物理课程的改革。 为此，将开发一个新的中级实验室课程，强调现代物理实验的实践经验。 此外，将引入一个先进的实验室选修课程，让学生在一个研究式的环境中的经验。 量子世界和经典世界之间的边界在哪里，以及边界的定义是物理学中一些最基本的问题，对实用量子计算机的发展至关重要。 该学院早期职业发展（CAREER）项目专注于单分子磁体和超导设备的低温研究，以了解这些系统如何通过与各自环境的相互作用而失去“量子性”。 实验将侧重于控制这些系统如何改变它们的量子态，并通过工程设计它们相互作用的环境。 它们的量子行为是如何被受控环境改变的，这将揭示量子-经典前沿的本质。 所有这些项目将在阿默斯特学院进行，本科生参与。 研究还将涉及与马萨诸塞州大学阿默斯特分校的师生合作。该项目的教育方面涉及阿默斯特学院物理课程的改革。 为此，将开发一个新的中级实验室课程，强调现代物理实验的实践经验。 此外，将引入一个先进的实验室选修课程，让学生在一个研究式的环境中的经验。