路径简并量子干涉术用于引力波探测器中退相干抑制
Path-Degenerate Quantum Interferometry for Decoherence Mitigation in Gravitational-Wave Detectors
- Universität Hamburg（汉堡大学）
- Russian Quantum Center, Skolkovo IC（俄罗斯量子中心，斯科尔科沃创新中心）
- Faculty of Physics, M V Lomonosov Moscow State University（莫斯科国立大学物理学院）
机构由 AI 辅助整理，请以论文原文为准。
中文总结 AI 辅助
提出路径简并量子干涉方案，通过消除额外光学子系统并集成变分输出来抑制退相干，实验证明可增强信号并提升引力波探测器的量子噪声抑制能力。
中文摘要 AI 辅助
光学退相干会降低压缩光态中的量子关联，严重限制引力波探测器的量子非 demolition（QND）灵敏度。在此，我们提出路径简并量子干涉方案，该方案无需整个光学子系统——包括额外的滤波腔、辅助参量放大器和法拉第隔离器——从而大幅减少空间模式失配，同时固有地集成了变分输出，这是一项长期的理论提议，旨在进一步深化QND机制。我们实验演示了该方案的核心方面，实现了保持散粒噪声的信号增强，直接抵消了读出损耗的有害影响。通过仅整合和减少当前考虑的光学子系统来提供改进的信号-量子噪声比，我们的方法为即将到来的LIGO升级和下一代引力波观测站中增强的量子噪声抑制提供了一条高度优化的路径。
英文摘要
Optical decoherence degrades quantum correlations in squeezed states of light, severely limiting the quantum-nondemolition (QND) sensitivity of gravitational-wave detectors. Here, we propose the path-degenerate quantum interferometry scheme that obviates the need for entire optical subsystems---including additional filter cavities, auxiliary parametric amplifiers, and Faraday isolators---thereby drastically reducing spatial mode mismatches while inherently integrating variational output, a long-standing theoretical proposal to further deepen the QND regime. We experimentally demonstrate a core aspect of this scheme, achieving a shot-noise-preserving signal enhancement that directly counteracts the detrimental effects of readout loss. By delivering an improved signal-to-quantum-noise ratio solely through the consolidation and reduction of currently considered optical subsystems, our approach offers a highly optimized route toward enhanced quantum-noise reduction in upcoming LIGO upgrades and next-generation gravitational-wave observatories.
