标题： 暗态光子纠缠滤波器 显示英文标题

标题： Dark-state photonic entanglement filters

摘要： 在退相干存在的情况下保持纠缠仍然是量子技术面临的主要挑战。 最近的提案 [M.A. Selim 等人，Science 387, 1424 (2025)] 采用基于反宇称时间对称性的光子滤波器来恢复某些纠缠态，但这些方法需要复杂的、受对称性约束的波导结构和精确的环境工程。 在本工作中，我们表明这种严格的非厄米对称性约束对于纠缠滤波并非必要。 相反，我们识别出后选择以及通过简单光子设置中的破坏性干涉自然出现的暗态作为关键机制。 通过避免对特殊环境工程或非厄米对称性的需求，我们的方法显著简化了设计和架构，提高了通用性，并将适用范围扩展到之前研究的二聚体配置之外。 我们使用最小的波导网络设计验证了这一概念，提供了一种广泛可访问的稳健纠缠滤波途径。 显示英文摘要

摘要： Preserving entanglement in the presence of decoherence remains a major challenge for quantum technologies. Recent proposals [M.A. Selim et al., Science 387, 1424 (2025)] have employed photonic filters based on anti-parity-time symmetry to recover certain entangled states, but these approaches require intricate, symmetry-constrained waveguide architectures and precise bath engineering. In this work, we show that such strict non-Hermitian symmetry constraints are not necessary for entanglement filtering. Instead, we identify post-selection and the emergence of dark states -- arising naturally through destructive interference in simple photonic settings -- as the essential mechanisms. By avoiding the need for special bath engineering or non-Hermitian symmetries, our approach significantly simplifies the design and architecture, enhances universality, and extends applicability beyond previously studied dimer configurations. We demonstrate this concept using minimal waveguide network designs, offering a broadly accessible route to robust entanglement filtering.