Latest news with #LongGuilu
South China Morning Post
25-02-2025
- Science
- South China Morning Post
Back to the future: Chinese team's record transmission lays ground for quantum internet
Chinese scientists have set a transmission record in quantum secure direct communication, which brings the technology to the internet dial-up speed of the 1990s and sets the stage for a future quantum internet. Advertisement The team's new quasi-quantum secure direct communication (QSDC) protocol set both a transmission and a distance world record with a transmission rate of 2.38 kilobits per second (kbps) over 104.8km (65 miles) of standard telecommunications optical fibre. This speed allows for the secure transmission of text, voice, and image files in quantum states, making it potentially useful for securely sending small amounts of sensitive information – such as financial data or information vital for national security. 05:00 Does the arrival of China's low-cost DeepSeek mean the end of Nvidia's chip dominance? Does the arrival of China's low-cost DeepSeek mean the end of Nvidia's chip dominance? 'This system paved the way for the practical application of QSDC and offers a unique method to detect eavesdropping online, which is crucial in certain circumstances,' the team wrote in a paper published in the peer-reviewed journal Science Advances on February 21. Inventor of the QSDC technology Long Guilu, a physics professor at Tsinghua University and vice-president of the Beijing Academy of Quantum Information Sciences, said the protocol could also be used for constructing a quantum internet. Unlike the classical internet, in which information is transmitted as bits, a quantum internet would aim to enhance internet capabilities and security by leveraging quantum bits, or qubits, and quantum phenomena to achieve ultra-secure connection. Advertisement 'Prototype quantum internet based on this protocol has already been built in our lab,' Long said.
Times of Oman
24-02-2025
- Science
- Times of Oman
Chinese researchers develop system for quantum direct communication
Beijing: A team of Chinese researchers proposed a theory of one-way quantum direct communication and successfully developed a practical system, advancing quantum direct communication from a concept to the stage of practical application. According to a study recently published in Science Advances, researchers from the Beijing Academy of Quantum Information Sciences, Tsinghua University, and North China University of Technology set a record in a standard optical fibre communication test with a transmission distance of 104.8 km. They achieved stable transmission at a rate of 2.38 kilobit per second for 168 consecutive hours. Quantum direct communication was previously proposed by a team led by Long Guilu from Tsinghua University, one of the corresponding authors of the study paper. It enables secure communication by utilising quantum states and features characteristics, such as eavesdropping detection and prevention, compatibility with existing networks, simplified management processes, and covert transmission. The core challenge in this field is achieving secure and reliable communication using quantum states with extremely low energy. These states are highly susceptible to interference in quantum channels characterised by high noise, high loss, and the risk of eavesdropping. Previous research used bidirectional protocols, in which both communicating parties had to transmit quantum states back and forth. This resulted in significant system loss and severely limited communication performance improvement. "In 2022, we set a world record for quantum direct communication over 100 kilometers, but the rate was only 0.5 bit per second, which allowed transmission of messages with very few characters," Long recalled. He explained that one-way transmission could halve the distance of quantum state transmission, significantly reducing loss, which is the key to improving the performance of quantum direct communication. The researchers developed high-noise and high-loss channel coding and other key technologies to propose a theoretical method for one-way quantum direct communication. They resolved the technical challenges and completed the development of the communication terminal. The new system's communication rate has increased by 4,760 times compared with the one developed in 2022, significantly enhancing the performance of quantum direct communication. According to Long, quantum direct communication systems are expected to be widely applied in fields with extremely high requirements for information security, such as government affairs and finance. There are two main types of quantum secure communication. One is quantum key distribution, which uses quantum states to generate keys while transmitting encrypted information through classical communication. Its advantage is the high transmission rate. The other is quantum direct communication, which directly transmits information using quantum states. In the event of eavesdropping, the quantum states can self-destruct to ensure information security.
