京都大学和广岛大学的研究人员开发并实验验证了识别W态多光子量子纠缠的新方法，填补了长达25年的技术空白1。这一突破基于W态的循环移位对称性这一数学特性，利用光子量子电路和量子傅里叶变换来实现测量1。
研究团队在三光子系统中完成了实验验证，成功区分了不同类型的三光子W态1。项目负责人Shigeki Takeuchi表示："25多年后，我们终于获得了W态的纠缠测量，以及三光子W态的真正实验演示"1。这项研究成果已发表于《科学进展》期刊2025年第11卷第37期1。该方法的实现有望在量子传送、量子通信和量子计算等领域推动进展1。
Researchers from Kyoto University and Hiroshima University have achieved a significant breakthrough in quantum physics by developing and experimentally validating a new method for identifying W-state multi-photon quantum entanglement, resolving a technical gap that has persisted for over 25 years 1. The approach leverages the cyclic symmetry properties of W-states and employs photonic quantum circuits combined with quantum Fourier transformation to achieve measurement and identification of three-photon W-states 1.
The experimental demonstration successfully distinguished between different types of three-photon W-states, marking the first genuine experimental validation of W-state entanglement measurement 1. According to researcher Shigeki Takeuchi, "After more than 25 years, we have finally obtained the entanglement measurement of W-states and a true experimental demonstration of three-photon W-states" 1. The findings, published in Science Advances Volume 11, Issue 37 in 2025 (DOI: 10.1126/sciadv.adx4180), are expected to advance the development of quantum teleportation, quantum communication, and quantum computing 1.
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