Chinese scientists achieve breakthrough in long-distance terahertz wireless communication

Chinese scientists have successfully transmitted high-definition video signals over kilometers using terahertz wireless communication technology, marking the world's first case to apply superconducting terahertz receivers to long-distance wireless communication systems.

Terahertz waves refer to electromagnetic waves with wavelengths between 3,000 and 30 micrometers, sitting between microwaves and optical infrared frequencies. Research into the terahertz range deepens the understanding of fundamental scientific questions in physics, astronomy, and information science. Applications for terahertz technology span various fields, including astronomical observation, biomedical science, and data transmission, with significant implications for cutting-edge research, national economic development, and security.

The experiment was carried out from Sept 27 to Oct 1 at the submillimeter-wave astronomical observation base at an altitude of over 4,000 meters located on the Qinghai-Xizang Plateau. Researchers from the Purple Mountain Observatory under Chinese Academy of Sciences led the experiment with other teams.

"For example, if we see microwave communication as a two-lane road, then terahertz communication, due to its broader and richer spectrum resources, is like expanding that road to six or eight lanes. The significance of the superconducting detection technology we used this time lies in its high sensitivity. It's like having better-performing cars on this wider road, with almost no energy loss, allowing the signals to travel much farther," said Li Jing, researcher at the Purple Mountain Observatory.

This experiment has fully demonstrated the unique advantages of using superconducting receivers in terahertz communication, laying critical technical foundation for future space and air-to-ground high-capacity terahertz communication, as well as the construction of a multi-disciplinary platform at the submillimeter-wave observatory.

Chinese scientists achieve breakthrough in long-distance terahertz wireless communication

Chinese scientists achieve breakthrough in long-distance terahertz wireless communication

China's express delivery sector continued to post significant growth in the first 11 months of 2025, handling over 180 billion parcels to record a nearly 15 percent year-on-year increase, official data showed on Tuesday.

According to the State Post Bureau, the country's China's broader postal industry, which includes express delivery services, saw a total of 196.75 billion parcels from January through November, marking a 12.9 percent rise from the same period in 2024.

The postal industry's total business revenue exceeded 1.63 trillion yuan (over 230 billion U.S. dollars), up 6.7 percent year on year, the data showed.

Specifically, the overall express delivery revenue reached nearly 1.36 trillion yuan, a 7.1 percent increase compared to the previous year.

Same-city express deliveries amounted to 14.47 billion parcels, a 2.2 percent year-on-year increase, while cross-region deliveries surged by 16.3 percent to 162.44 billion parcels.

The total volume of express deliveries to overseas countries and China's Hong Kong, Macao and Taiwan regions reached 3.83 billion parcels, a year-on-year increase of 11.3 percent.

In November alone, China's postal industry handled 19.49 billion parcels, up 3.8 percent year on year. Among these, more than 18 billion parcels were handled in express delivery sector, up 5 percent year on year.

In November, the postal industry's business revenue, excluding the direct business revenue of Postal Savings Bank, reached 162.68 billion yuan (over 23 billion U.S. dollars), a year-on-year decrease of 2.0 percent.

Specifically, express delivery revenue reached 137.65 billion yuan (around 19.5 billion U.S. dollars), showing a year-on-year decrease of 3.7 percent.

China's express delivery sector posts double-digit growth in first 11 months