在宇宙布下“监听系统”！我国新增量子神器

Core Viewpoint - The research team from the University of Science and Technology of China has developed an innovative nuclear spin quantum precision measurement technology, establishing the world's first quantum sensing network based on atomic nuclear spins, significantly enhancing the sensitivity for dark matter detection and providing a new pathway to unravel this cosmic mystery [1][2]. Group 1: Quantum Sensing Technology - The team has overcome the challenge of detecting transient signals from inert gas atom (129Xe) nuclear spins, enabling the storage of microsecond-level dark matter topological defect structure signals into nearly minute-level nuclear spin coherence states [2]. - The newly developed nuclear spin quantum amplification technology has amplified weak signals by at least 100 times, achieving a spin rotation detection sensitivity of approximately 1 micro-radian, which is an improvement of about four orders of magnitude compared to previous laboratory detection technologies [2]. Group 2: Dark Matter Detection Network - The intercity quantum sensing network, consisting of five self-developed nuclear spin quantum sensors distributed between Hefei and Hangzhou, utilizes satellite synchronization to achieve distributed quantum sensing over a span of 320 kilometers, forming a highly sensitive dark matter signal identification system [4]. - The long baseline of the network allows for distinguishable signal delays and phase differences between real dark matter events at different nodes, effectively suppressing local interference and reducing the false alarm rate by about three orders of magnitude [4]. Group 3: Experimental Results and Implications - After two months of continuous observation and data analysis from the quantum sensing network, the research team did not find statistically significant topological defect crossing events, leading to the most stringent laboratory limits on axion-neutron coupling in a wide mass range from 10 peV to 0.2 μeV [5]. - Particularly around 84 peV, the upper limit of the coupling scale reached 4.1×10^10 GeV, surpassing the astrophysical limits from supernova SN1987A by 40 times, providing a means to explore physical parameter spaces beyond astronomical observations [5]. Group 4: Future Directions and Strategic Importance - This research not only offers a new approach for detecting topological defect dark matter but also opens new directions for searching for axion stars and other transient phenomena beyond the standard model, potentially forming a multi-messenger observation network with gravitational wave observatories [7]. - The team plans to enhance detection sensitivity by another 10,000 times through global networking and space deployment, pushing the boundaries of physical exploration [7]. - The rapid iteration of AI technology and the intensifying global technological competition highlight the strategic significance of quantum technology as a core potential area in the new wave of technological revolution [7].