Title: Ge-based Quantum Sensors for Low-Energy Physics Show Chinese title

Title: 基于锗的量子传感器用于低能物理

Abstract: We present \textbf{GeQuLEP} (Germanium-based Quantum Sensors for Low-Energy Physics), a conceptual design for an advanced quantum sensing platform integrating high-purity germanium (Ge) crystals with engineered phononic crystal cavities. At cryogenic temperatures, these cavities naturally host dipole-bound states, effectively forming quantum dots coupled to radio-frequency quantum point contact (RF-QPC) readout systems. This innovative coupling approach promises ultra-sensitive phonon-mediated charge detection through phonon-induced charge displacement. GeQuLEP is specifically designed to achieve exceptionally low detection thresholds, theoretically enabling single primary phonon sensitivity with anticipated energy depositions as low as \textbf{0.00745~eV}. This unprecedented sensitivity, if realized experimentally, would provide unique access to searches for low-mass dark matter down to the keV/$c^2$ mass range via nuclear and electronic recoils. Additionally, GeQuLEP aims to facilitate the real-time detection of solar \textit{pp} neutrinos through coherent elastic neutrino--nucleus scattering (CE$\nu$NS). By combining phonon-based quantum transduction with quantum-classical hybrid readout schemes, the GeQuLEP architecture represents a scalable, contact-free phonon spectroscopy design that could significantly advance the capabilities of ultra-low-energy rare-event detection at the quantum limit. Show Chinese abstract

Abstract: 我们提出\textbf{几何LEP}（基于锗的低能物理量子传感器），这是一种先进的量子传感平台的概念设计，将高纯度锗（Ge）晶体与工程化声子晶体腔集成在一起。 在低温下，这些腔体自然地容纳偶极子束缚态，有效地形成与射频量子点接触（RF-QPC）读出系统耦合的量子点。 这种创新的耦合方法通过声子诱导的电荷位移，有望实现超灵敏的声子介导电荷检测。 GeQuLEP 特别设计以实现极低的探测阈值，理论上能够实现单个初级声子的灵敏度，预期能量沉积低至\textbf{0.00745 电子伏特}。 如果在实验中实现这种前所未有的灵敏度，将为通过核和电子反冲搜索质量低至 keV/$c^2$的低质量暗物质提供独特的途径。 此外，GeQuLEP 旨在通过相干弹性中微子-核散射（CE$\nu$NS）实现实时检测太阳\textit{pp}中微子。 通过结合基于声子的量子转换与量子-经典混合读出方案，GeQuLEP 架构代表了一种可扩展的、非接触式声子光谱设计，可能显著提升量子极限下的超低能稀有事件探测能力。