论文标题
电路量子电动力学的功能重归其化组方法
Functional Renormalization Group Approach to Circuit Quantum Electrodynamics
论文作者
论文摘要
开发了一种非扰动方法，以分析在功能重新归一化组框架内量化电磁连续性的超导电路。形式主义使我们能够确定具有高阻抗波导的电路量子电动力学（CQED）体系结构中平衡特性的完整物理图片，这些体系结构最近在实验中已可以访问。我们指出，非扰动效应可以触发所谓有效的描述的细分，例如自旋 - 玻色子和边界正弦模型，并导致定性新的相图。常规理解失败的起源可追溯到低能量尺度上电路参数的强烈重归其化。我们的结果表明，非扰动分析对于对由超导电路和长高阻力传输线组成的CQED平台的全面理解至关重要。
A nonperturbative approach is developed to analyze superconducting circuits coupled to quantized electromagnetic continuum within the framework of the functional renormalization group. The formalism allows us to determine complete physical pictures of equilibrium properties in the circuit quantum electrodynamics (cQED) architectures with high-impedance waveguides, which have recently become accessible in experiments. We point out that nonperturbative effects can trigger breakdown of the supposedly effective descriptions, such as the spin-boson and boundary sine-Gordon models, and lead to qualitatively new phase diagrams. The origin of the failure of conventional understandings is traced to strong renormalizations of circuit parameters at low-energy scales. Our results indicate that a nonperturbative analysis is essential for a comprehensive understanding of cQED platforms consisting of superconducting circuits and long high-impedance transmission lines.
