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 top housing authority has noted "overall positive changes" in the real estate market, as homebuyer confidence was revived by a series of beneficial measures announced by major Chinese cities since September to boost the country's property markets.
The Ministry of Housing and Urban-Rural Development said most cities have seen a rise in visits to property projects by over 50 percent from a year ago.
Thanks to new policy adjustments on Sept 30, both transaction volume and inquiries for second-hand homes in Beijing increased notably during the week-long National Day holiday, which runs from Oct 1 to 7.
"On Oct 1, four orders were signed at our store and on Oct 2, one order was signed, bringing the total number to five. This marks a historical peak in our transaction records," said Liu Qiujing, a house agent at Huilongguan sub-branch of Lianjia Real Estate Brokerage in Beijing.
She also reported that property viewings at her store stood at 39 groups during the holiday, an increase of 15 groups over the previous week.
According to a circular jointly issued by six municipal departments on Sept 30, non-Beijing residents are allowed to purchase homes inside the city's fifth ring road if they have a record of paying social insurance or individual income tax in the city for at least three years - down from five years as was previously required.
The new policies which took effect on Oct 1 also lift the housing purchase restrictions in Tongzhou District, where the Beijing Municipal Administrative Center is located, to allow the district's homebuying rules to comply with the city's unified property market policy.
Under the new rules, homebuyers face less financial pressure, as the minimum down payment ratio for individual commercial mortgages are reduced from 20 percent to 15 percent for first-home purchases, and from 30 percent to 20 percent for second homes.
"Following the introduction of the new regulations, buyers have shown a stronger willingness to purchase properties, acquiring them more swiftly. Clients with rigid demand for residential housing are swiftly entering the market. From the perspective of homebuyers, their confidence has significantly increased," said Liu.
Between Oct 1 and noon of Oct 3, on-site inquiries for second-hand homes in Beijing jumped by 104.1 percent year on year, according to a report on the Ministry of Housing and Urban-Rural Development.
China's housing market sees positive changes following eased homebuying rules
