The Emergence of Classicality via Decoherence: Beyond the Caldeira-Legget Environment

The double Caldeira-Leggett model: Derivation and solutions of the master equations, reservoir-induced interactions and decoherence

In this paper we analyze the double Caldeira-Leggett model: the path integral approach to two interacting dissipative harmonic oscillators. Assuming a general form of the interaction between the oscillators, we consider two different situations: i) when each oscillator is coupled to its own reservoir, and ii) when both oscillators are coupled to a common reservoir. After deriving and solving the master equation for each case, we analyze the decoherence process of particular entanglements in the positional space of both oscillators. To analyze the decoherence mechanism we have derived a general…

相位耦合Caldeira-Leggett模型：超越线性耗散的非马尔可夫开放量子动力学

The Phase-Coupled Caldeira-Leggett Model: Non-Markovian Open Quantum Dynamics beyond Linear Dissipation

本研究提出具有指数系统-浴耦合的相位耦合Caldeira-Leggett（PCL）模型，利用环境高斯特性得到约化密度算符的精确非马尔可夫运动方程，发现其动力学行为与传统线性耦合模型显著不同，为研究非线性量子耗散提供了新平台。

Decoherence of Coupled Quantum Oscillators: Going Beyond the Caldeira-Leggett Approximation

We calculate the reduced density matrix for a system of coupled harmonic oscillators in a bosonic heat bath using the Born-Markov approximation and show that the expectation values of position and momentum evolve like classical quantities. We consider the cases where every oscillator is coupled to its own reservoir and where all oscillators are coupled to the same heat bath, pointing out the differences between these two models. In particular, for systems coupled to a common reservoir, we present an uncommon dissipation mechanism, which disappears, when the dynamics of the system are gouverned…

适配的Caldeira-Leggett模型

Adapted Caldeira-Leggett Model

本文提出一种有限希尔伯特空间中的适配Caldeira-Leggett模型，支持完全可逆幺正演化，用于数值研究退相干与环境诱导超选择，避免主方程近似限制。

Momentum-space decoherence of distinguishable and identical particles in the Caldeira-Leggett formalism

In this work, momentum-space decoherence using minimum and nonminimum-uncertainty-product (stretched) Gaussian wave packets in the framework of Caldeira-Leggett formalism and under the presence of a linear potential is studied. As a dimensionless measure of decoherence, purity, a quantity appearing in the definition of the {\it linear entropy}, is studied taking into account the role of the stretching parameter. Special emphasis is on the open dynamics of the well-known cat states and bosons and fermions compared to distinguishable particles. For the cat state, while the stretching parameter s…

表面码的量子退相干：一种广义的卡雷迪拉-莱格格特方法

Quantum Decoherence of the Surface Code: A Generalized Caldeira-Leggett Approach

本文研究了主动纠错表面码与连续量子环境的退相干极限，通过广义卡雷迪拉-莱格格特框架，将逻辑量子比特的长期演化映射到边界共形场理论，揭示了短程环境中存在真正的热力学阈值。

双重 Caldeira-Leggett 形式体系内量子关联的动力学

Dynamics of Quantum Correlations within the double Caldeira-Leggett formalism

该研究在双重 Caldeira-Leggett 高温模型中比较共同与分离环境，揭示退相干和初始压缩对局域相干、熵、EPR 关联及纠缠动力学的不同作用。

An analytical relation between entropy production and quantum Lyapunov exponents for Gaussian bipartite systems

We study and compare the information loss of a large class of Gaussian bipartite systems. It includes the usual Caldeira-Leggett type model as well as Anosov models (parametric oscillators, the inverted oscillator environment, etc), which exhibit instability, one of the most important characteristics of chaotic systems. We establish a rigorous connection between the quantum Lyapunov exponents and coherence loss, and show that in the case of unstable environments coherence loss is completely determined by the upper quantum Lyapunov exponent, a behavior which is more universal than that of the C…

在计算机上通过实时路径积分研究Caldeira-Leggett模型中的量子退相干

Quantum decoherence in the Caldeira-Leggett model by the real-time path integral on a computer

本文利用实时路径积分与Lefschetz thimble方法对Caldeira-Leggett模型进行第一性原理计算，解析求得长时间演化后的约化密度矩阵，并验证了退相干时间对耦合常数和温度的依赖关系。

Caldeira-Leggett oscillator bath simulation of the Prokof'ev-Stamp spin bath in strong coupling limits

Open quantum systems are subject to interaction with their surrounding environments. The environments are in general complex and intractable. At low temperatures, quantum environments are mapped onto two simpler universality classes of models, namely oscillator bath and spin bath models. The two models are commonly recognized as completely distinct at strong coupling limits. In particular, it is believed, that they cause two different dissipative relaxation rates when they act on qubits. It is also believed that at such a limit the relaxation rate caused by the spin bath model cannot be simula…

退相干与从环境中提取信息之间的互补性

Complementarity between decoherence and information retrieval from the environment

针对开放量子系统中从环境提取信息的基本限制问题，推导出无反冲极限下的量子-经典混合解，应用于Caldeira-Leggett模型时揭示了可区分性长度与量子Fisher信息核，为间接观测精度设定了限制。

Testing Quantum Dissipation Theory with Electron Diffraction

Decoherence can be provided by a dissipative environment as described by the Caldeira-Leggett equation. This equation is foundational to the theory of quantum dissipation. However, no experimental test has been performed that measures for one physical system both the dissipation and the decoherence. Anglin and Zurek predicted that a resistive surface could provide such a dissipative environment for a free electron wave passing close to it. We propose that the electron wave's coherence and energy loss can be measured simultaneously by using Kapitza-Dirac scattering for varying light intensity.

开放量子系统的Krylov复杂度：耗散与退相干

Krylov Complexity for Open Quantum System: Dissipation and Decoherence

研究开放量子系统中Krylov复杂度，通过Lindblad主方程分析玻色子浴模型，重点探讨Caldeira-Leggett模型，发现耗散特性及退相干影响。

量子上下文性在经典极限中消失

How Quantum Contextuality disappears in the Classical Limit

本文研究了量子上下文性在经典极限中的消失问题，通过分析KCBS和Peres-Mermin实验方案在去极化通道中的动态，揭示开放系统如何抑制上下文性所需的相关性，导致经典化。

标度不变开放量子系统

Scale-Invariant Open Quantum Systems

本文建立了与标度不变环境耦合的开放量子系统的完整理论框架，通过唯一性定理推导出非马尔可夫记忆核和分数阶Caldeira-Leggett主方程，揭示了标度维数调控的丰富相结构，并应用于量子临界系统、暴胀宇宙学和高能天体物理中微子等物理系统。