technology
This Chinese device can detect trains running underground

Chinese researchers have demonstrated a handheld quantum magnetometer by successfully tracking an underground subway train, as detailed in a study published in Acta Physica Sinica.
The handheld quantum magnetometer was developed by Peng Xinhua and his team at the University of Science and Technology of China.
The study detailing its development was published in Acta Physica Sinica on September 14.
Despite its small size, the de... [489 chars]
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