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纠缠是量子理论中一种独特的现象，揭示了经典物理与量子物理之间的根本差异。虽然在微观尺度上已经观察到许多纠缠现象，但当涉及大尺度系统的相互作用时，纠缠往往非常微弱，此时实验设备的误差可能掩盖微弱信号，导致纠缠难以测得。为了提升对微弱纠缠信号的检测灵敏度，最近提出了一种基于量子导引的弱纠缠判据，可以有效地检测微弱的纠缠态。我们在理论上证明了该判据相比于传统纠缠目击者判据在弱纠缠检测能力方面具有明显优势。此外，我们通过光学实验验证了这一判据的可行性，实验结果为其有效性提供了关键支持，并展示了该判据在弱纠缠态检测中的创新性和可靠性。该判据作为一种有效的弱纠缠检测手段，有望在量子通信、量子计算等量子技术领域中得到广泛应用。Quantum entanglement is a defining feature of quantum mechanics and lies at the heart of many quantum technologies. While entanglement is routinely observed in small-scale systems, detecting weak entanglement in large or noisy systems remains a significant challenge, as experimental imperfections can easily obscure fragile quantum correlations. A new weak entanglement detection criterion based on quantum steering has recently been proposed as a potential alternative to conventional entanglement witnesses. In this work, we provide a theoretical analysis comparing the detection capabilities of the steering-based criterion with those of traditional entanglement witnesses under realistic measurement errors. The results show that the steering-based approach offers improved sensitivity for detecting weak entanglement. We further experimentally verify the feasibility of this steering-based criterion using a linear optical setup. The experimental results align well with theoretical predictions, confirming the practicality and reliability of the method. These findings establish the steering-based criterion as a promising and accessible tool for weak entanglement detection, with potential applications in quantum communication, quantum computing, and other areas of quantum information science.
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