EXPLORING NONLINEAR QUANTUM DYNAMICS WITH SUPERCONDUCTING CIRCUITS

用超导电路探索非线性量子动力学

• 批准号: 1940674
• 金额: --
• 依托单位: University of Nottingham
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1940674
• 关键词: EXPLORING; NONLINEAR; QUANTUM; DYNAMICS; SUPERCONDUCTING

Circuit quantum electrodynamics (QED) devices typically consist of 'artificial atoms' containing Josephson junctions (JJ) coupled to modes of the electromagnetic field confined within a microwave cavity. Such systems facilitate strong interactions between the microwave electromagnetic field and the artificial atoms, whilst at the same time suppressing decoherence. Circuit QED has already proved an extremely fruitful tool for exploring quantum physics, opening up exciting new avenues of research in areas as diverse as many-body quantum physics, ultra-strong light-matter coupling the production of highly non-classical states and quantum vacuum fluctuations. This project aims to develop theoretical models for a new class of circuit-QED devices in which a JJ is embedded within a microwave cavity and a dc bias voltage applied rather than ac control fields, leading to the flow of a current of charges through the device. Such systems bring together two important subfields of physics: the quantum transport of charge (i.e. Cooper pairs) and the quantum optics of photons in the microwave cavity. Furthermore, the interactions between charges and photons are highly nonlinear and can be made exceptionally strong. The project will explore the fascinating physics of such systems and their connections with other driven-dissipative quantum systems.

电路量子电动力学（QED）器件通常由包含约瑟夫森结（JJ）的“人造原子”组成，该约瑟夫森结耦合到微波腔内的电磁场模式。这样的系统促进微波电磁场和人造原子之间的强相互作用，同时抑制退相干。电路QED已经被证明是探索量子物理的一个非常富有成效的工具，在多体量子物理、超强光物质耦合产生高度非经典态和量子真空涨落等不同领域开辟了令人兴奋的新研究途径。该项目旨在为一类新的电路QED器件开发理论模型，其中JJ嵌入在微波腔中，并施加直流偏置电压而不是交流控制场，从而导致电流通过器件。这种系统将物理学的两个重要子领域结合在一起：电荷的量子传输（即库珀对）和微波腔中光子的量子光学。此外，电荷和光子之间的相互作用是高度非线性的，并且可以变得非常强。该项目将探索这些系统的迷人物理学及其与其他驱动耗散量子系统的联系。

项目成果

Theory of double Cooper-pair tunneling and light emission mediated by a resonator

谐振器介导的双库珀对隧道效应和光发射理论

• DOI: 10.1103/physrevb.100.054515
• 发表时间: 2019
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Morley W