Chinese scientists have achieved a groundbreaking milestone by constructing the world's first quantum network specifically designed to detect dark matter. This innovative network connects two laboratories in the eastern Chinese cities of Hefei and Hangzhou, spanning a distance of over 300 kilometers. The research, published in Nature, showcases an unprecedented level of sensitivity in the search for axions, hypothetical particles believed to make up the universe's 'missing mass.'
Dark matter, comprising 26.8% of the cosmos, remains elusive, interacting solely through gravity. When Earth traverses these invisible boundaries, axions may exert a brief tug on atomic nuclei, generating fleeting signals akin to a snowflake landing in a crowded square. To capture these subtle whispers, scientists from the University of Science and Technology of China employed a distributed approach, deploying five synchronized sensors across both cities. This method effectively filters local interference by requiring simultaneous signal appearances at multiple sites.
Furthermore, the study introduces new quantum amplification techniques that amplify weak signals by a factor of one hundred, while extended coherence times broaden the detection window to minutes. Despite no definitive dark matter encounters during the two-month observation period, the team set the most stringent constraints on axion-nucleon coupling across a specific mass range, surpassing astronomical observations by up to 40 times.
Peng Xinhua, co-corresponding author of the study, envisions expanding this 'quantum net' globally and into space, potentially transforming our understanding of the universe's hidden structure. This breakthrough opens up exciting possibilities for humanity's exploration of the cosmos, inviting further research and discussion on the nature of dark matter and its elusive particles.
