Quantum Phase Transitions And Many-Body Localization In Unconventional 1D Josephson Arrays

非技术摘要我们生活在建立在量子力学基础上的经典世界。经典行为的迷人复杂性是如何从我们世界的量子本质中显现出来的？该研究项目通过设计由超导体（所谓的约瑟夫森结阵列）制成的复杂量子系统，并使用为表征量子比特而开发的方法探索它们在超低温下的行为，来解决这个基本问题。该研究计划的实现对于量子超导电子学的新兴领域非常重要：约瑟夫森阵列为构建具有改进相干性的量子比特提供了新的令人兴奋的机会。 该项目支持研究生的教育，他们广泛接触现代固态研究的最先进工具。多组件的教育和推广计划，该项目的一个重要组成部分，旨在开发创新的nanoscience courses.TECHNICAL ABSTRACTThis奖支持实验研究的两个基本问题的量子力学相互作用的量子系统：量子相变在一维，和多体本地化的复杂量子系统孤立于环境。为了解决这些现象，设计了新型纳米级约瑟夫森结阵列来模拟量子模型的范围。该研究计划的目标是探索量子临界点附近新对称的出现以及这些新系统的动力学，使用微波光谱和时域技术来表征超低温下的超导量子比特。该研究计划的实现对量子超导电子学这一广阔的领域具有重要意义。 特别是，具有大动态电感和最小损耗的约瑟夫森阵列的开发提供了新的功能，例如容错量子位和量子电路的高阻抗隔离。 该项目支持研究生的教育，他们广泛接触现代固态研究的最先进工具。多组成部分的教育和推广计划是该项目的重要组成部分，旨在开发创新的纳米科学课程。

NON-TECHNICAL ABSTRACTWe live in the classical world which is built upon quantum mechanics. How does the fascinating complexity of classical behaviors emerge from the underlying quantum nature of our world? This research project addresses this fundamental question by designing the complex quantum systems made of superconductors (the so-called arrays of Josephson junctions) and exploring their behavior at ultra-low temperatures using the methods developed for the characterization of quantum bits. Realization of the research program is important for the nascent field of quantum superconducting electronics: the Josephson arrays offer novel exciting opportunities for building quantum bits with improved coherence. The project supports the education of graduate students who enjoy broad exposure to the state-of-the-art tools of modern solid state research. The multi-component Educational and Outreach Program, an essential part of the project, is designed to develop innovative nanoscience curricula.TECHNICAL ABSTRACTThis award supports experimental research on two fundamental problems of quantum mechanics of interacting quantum systems: the quantum phase transitions in one dimension, and the many-body localization in complex quantum systems isolated from the environment. To address these phenomena, novel arrays of nanoscale Josephson junctions are designed to emulate the range of quantum models. The objectives of the research program are to explore the emergence of novel symmetries near the quantum critical point and the dynamics of these novel systems using the microwave spectroscopic and time-domain techniques developed for the characterization of superconducting qubits at ultra-low temperatures. Realization of the research program is important for the broad field of quantum superconducting electronics. In particular, the development of Josephson arrays with large kinetic inductance and minimal losses offers new functionality, such as fault-tolerant qubits and high-impedance isolation of quantum circuits. The project supports the education of graduate students who enjoy broad exposure to the state-of-the-art tools of modern solid state research. The multi-component Educational and Outreach Program, an essential part of the project, is designed to develop innovative nanoscience curricula.