中国科学家研制出一款光学钟，其稳定性和不确定度均超过10^{-19}水平，与全球少数顶级实验室相当。该成果发表于《计量学》杂志，可能助力中国在重新定义秒方面发挥领先作用。
中国已跻身全球顶级计时行列，研制出一款新型光学钟。该钟的关键参数——稳定性和不确定度——均超过10^{-19}水平，这一成就仅由少数实验室实现，包括美国国家标准与技术研究院和德国国家标准实验室。团队在本月发表于《Metrologia》杂志的论文中报告了这一结果，其精度已超过重新定义秒所需的阈值。国家广播电视台CCTV称，这“允许中国在这一努力中发挥领先作用”。研究人员戴（Dai）于3月7日对CCTV表示：“它为使用光学钟检验基础物理、改进下一代卫星导航并构建统一超精密全球时间标准奠定了坚实基础。”光学钟是最精确的计时装置，利用激光在极低温下捕获锶和铷等原子，通过电子在能级间跃迁时发出的光频率来测量时间。该钟可能发展为更小、更稳定和便携的空间版本。关键词提及合肥、中国科学技术大学等，表明研究主要在中国进行。
由 AI 报道 AI 生成的图像
Physicists at MIT have developed a new microscope using terahertz light to directly observe hidden quantum vibrations inside a superconducting material for the first time. The device compresses terahertz light to overcome its wavelength limitations, revealing frictionless electron flows in BSCCO. This breakthrough could advance understanding of superconductivity and terahertz-based communications.
In an era dominated by digital precision, mechanical chronometer watches continue to symbolize the pursuit of accuracy in luxury horology. These timepieces, certified by independent bodies like COSC, connect modern enthusiasts to centuries-old innovations in timekeeping. The article explores their historical significance and ongoing relevance.
由 AI 报道
Researchers at the University of Science and Technology of China have developed the Jiuzhang 4.0 photonic quantum computing prototype, which manipulates 3,050 photons and sets a new record.
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.
由 AI 报道
China's China Spallation Neutron Source (CSNS) has reached a significant milestone in its Phase II construction, with its first beamline—the neutron technology development station—successfully producing a neutron beam. This marks the completion of equipment development and installation for the beamline. Located in Dongguan, Guangdong province, the facility operates like a super microscope, using neutrons to examine materials and support breakthroughs in renewable energy, aerospace, and bioscience.
Researchers at MIT have discovered that chaotic laser light can self-organize into a highly focused pencil beam, enabling 3D imaging of the blood-brain barrier 25 times faster than current methods. The technique allows real-time observation of drugs entering brain cells without fluorescent tags. This breakthrough could speed up development of treatments for neurological diseases like Alzheimer's and ALS.
由 AI 报道
Researchers from Kyoto University and Hiroshima University have created a new technique to identify W states, a complex form of quantum entanglement. The advance could support progress in quantum computing and communication.