Incoherent dynamics in neutron-matter interaction

Regimes of strong light-matter coupling under incoherent excitation

We study a two-level system (atom, superconducting qubit or quantum dot) strongly coupled to the single photonic mode of a cavity, in the presence of incoherent pumping and including detuning and dephasing. This system displays a striking quantum to classical transition. On the grounds of several approximations that reproduce to various degrees exact results obtained numerically, we separate five regimes of operations, that we term "linear", "quantum", "lasing", "quenching" and "thermal". In the fully quantized picture, the lasing regime arises as a condensation of dressed states and manifests…

Dynamical Semigroup Description of Coherent and Incoherent Particle-Matter Interaction

The meaning of statistical experiments with single microsystems in quantum mechanics is discussed and a general model in the framework of non-relativistic quantum field theory is proposed, to describe both coherent and incoherent interaction of a single microsystem with matter. Compactly developing the calculations with superoperators, it is shown that the introduction of a time scale, linked to irreversibility of the reduced dynamics, directly leads to a dynamical semigroup expressed in terms of quantities typical of scattering theory. Its generator consists of two terms, the first linked to …

消除非相干噪声：多传感器暗物质探测中的相干量子方法

Eliminating Incoherent Noise: A Coherent Quantum Approach in Multi-Sensor Dark Matter Detection

本研究提出一种利用多量子传感器网络量子相干性的暗物质探测新方案，通过基矢变换操作消除非相干背景噪声，经解析与模拟验证，信号强度随传感器数平方增强、噪声仅线性增长，为下一代暗物质搜寻提供新路径。

Incoherent-mediator for quantum state transfer in the ultrastrong coupling regime

We study quantum state transfer between two qubits coupled to a common quantum bus that is constituted by an ultrastrong coupled light-matter system. By tuning both qubit frequencies on resonance with a forbidden transition in the mediating system, we demonstrate a high-fidelity swap operation even though the quantum bus is thermally populated. This proposal may have applications on hot quantum information processing within the context of ultrastrong coupling regime of light-matter interaction.

非相干激发下腔QED的各区域：从弱耦合到深强耦合

Regimes of Cavity-QED under Incoherent Excitation: From Weak to Deep Strong Coupling

本文研究了二能级原子与量子化单模电磁场系统在非相干激发下、任意光-物质耦合强度下的光子通量发射率，解决了超强耦合区域的理论问题，并证明所有结果均具有规范不变性。

Steering Interchange of Polariton Branches via Coherent and Incoherent Dynamics

Controlling light-matter based quantum systems in the strong coupling regime allows for exploring quantum simulation of many-body physics in nowadays architectures. For instance, the atom-field interaction in a cavity QED network provides control and scalability for quantum information processing. Here, we propose the control of single- and two-body Jaynes-Cummings systems in a non-equilibrium scenario, which allows us to establish conditions for the coherent and incoherent interchange of polariton branches. Our findings provide a systematic approach to manipulate polaritons interchange, that …