Macroscopic Quantum Phenomena and Charge Fluctuations in Submicron Superconductor Devices

亚微米超导器件中的宏观量子现象和电荷涨落

• 批准号: 8722080
• 负责人: Dale Van Harlingen
• 金额: $ 25.93万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-04-01 至 1991-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8722080&HistoricalAwards=false
• 关键词: Macroscopic; Quantum; Phenomena; Charge; Fluctuations

Experiments will be carried out by Professor Van Harlingen to determine noise sources in ultrasmall area tunnel junctions and macroscopic quantum dynamics in Josephson superconductor devices. Superconductor devices have served important functions as sensitive detectors and amplifiers for research. Equally important, superconductor devices and thin film structures have proven to be valuable test systems for studying a wide range of important physical phenomena in condensed matter systems including quantum effects, localization, non-linear dynamics, chaos, phase transitions, and fluctuations. Two problems in particular will be studied, discreet charge trapping fluctuations, which are a major source of low frequency noise and will allow investigation of the kinetics and interactions of localized defect traps in amorphous materials, and quantum dynamics of macroscopic systems, which study will encompass the effect of dissipation on the evolution of quantum states and the validity of quantum mechanics and quantum measurement theory to complex physical systems.

Van Harlingen教授将进行实验，以确定超小区域隧道结中的噪声源和约瑟夫森超导器件中的宏观量子动力学。超导器件在研究中起着灵敏的探测器和放大器的重要作用。同样重要的是，超导器件和薄膜结构已被证明是研究凝聚态系统中广泛的重要物理现象的有价值的测试系统，包括量子效应、局域化、非线性动力学、混沌、相变和涨落。将特别研究两个问题，离散电荷陷阱波动，这是低频噪声的主要来源，并将允许研究非晶态材料中局域缺陷陷阱的动力学和相互作用，以及宏观系统的量子动力学，这项研究将包括耗散对量子态演化的影响，以及量子力学和量子测量理论对复杂物理系统的有效性。