中国科学技术大学研究人员成功部署多模量子中继网络，在14.5公里光纤中实现物质-物质纠缠。
该系统名为“Xinghan-2”，于5月7日在《自然光子学》期刊上发表。它解决了量子通信中的一个关键瓶颈，同时实现高传输速率和高保真度。
研究团队由李传锋和周宗权领导。他们开发了一种时间测量协议，结合多模量子存储器，使光子无需同时到达中间站。
评审专家指出，该系统的纠缠分布速率比以往城市量子中继快100多倍。保真度达到78.6%，并使用现有光纤基础设施。
李传锋表示，这是目前报道的最长物质-物质纠缠距离，并从实验室走向实际城市网络应用。
An international team of researchers has achieved a milestone in quantum communication by teleporting the polarization state of a single photon between two separate quantum dots over a 270-meter open-air link. The experiment, conducted at Sapienza University of Rome, demonstrates the potential for quantum relays in future quantum networks. The findings were published in Nature Communications.
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Qunnect, a Brooklyn-based company, has created technology to share quantum-entangled photons for secure communication networks. The firm recently achieved entanglement swapping over 17.6 kilometers of fiber-optic cables between Brooklyn and Manhattan. This advancement supports the development of an unhackable quantum internet.
Physicists at the University of Vienna have conducted an experiment demonstrating a superposition of different temporal orders in quantum events, using entangled photons and a Bell inequality equivalent. The results deviate significantly from classical expectations, suggesting indefinite causal order is a fundamental quantum feature. However, several experimental loopholes remain open.
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Researchers at East China Normal University have developed a new imaging technique that captures ultrafast events in trillionths of a second, revealing both brightness and structural changes in a single shot. The method, called compressed spectral-temporal coherent modulation femtosecond imaging (CST-CMFI), tracks phenomena like plasma formation and electron movement. Yunhua Yao, the team leader, described it as a major advance for physics, chemistry, and materials science.
China's Zhengzhou core node has doubled its chips to 60,000 from 30,000 since early February trials, becoming the nation's most powerful scientific intelligent computing infrastructure, CCTV reported.