What does the Tsinghua quantum entanglement make a breakthrough?

category:Internet
 What does the Tsinghua quantum entanglement make a breakthrough?


In the future, quantum communication and Quantum Internet will not only be realized through quantum interface, but also the communication and network speed will be greatly improved. Recently, the research team of Professor Duan Luming, a professor of cross information research at Tsinghua University, announced that it has made important progress in the field of quantum information, for the first time to achieve quantum entanglement between 25 quantum interfaces. The research paper has been published in the April 20th issue of science progress published in the American Journal of science. What does the publication of this result mean? It has a more efficient quantum interface, which is used to transform the quantum information between the transfer particles (photons) and the stored particles (usually atoms). It is an important interface between quantum memory or quantum computing unit and optical quantum communication channel. Therefore, quantum interface is also a basic component in quantum communication. Quantum is the smallest unit that can show the characteristics of a material or physical quantity. Particles also refer to the smallest material component that can exist in a free state. Therefore, in physics, the phenomenon of interaction between two or more than two particles is called quantum entanglement. Entanglement is the smallest substance, such as particles (photons), contact, superposition, and entanglement between atoms, that is, information transmission and communication, and it is precisely because of this communication that quantum communications, quantum computers, and Quantum Internet can be realized. Instantaneous transfer has an interface The Duan Luming team, through the beam splitting technique, realized the quantum entanglement between 25 quantum interfaces for the first time through experiments, which was about 6 times higher than the entanglement between the 4 quantum interfaces with the highest record. This means that not only can quantum communication and Quantum Internet be networked, but also communication and Internet speeds will be greatly improved in the future. From the history of human communication, it is already a leap from the telephone line (though broadband) to the optical fiber, and the speed and traffic flow is only hundreds of times higher. But if we use quantum communication, the transmission efficiency will be more than billion or trillions of times higher than that of 5Gs optical fiber channel. Of course, quantum communication needs medium. Light beam or optical fiber is an important medium for transmitting particles. In all information carriers, the photon runs fastest, so the beam is both information carrier and information itself. The research shows that high speed laser may be a better medium for quantum communication. High speed laser communication technology can complete high speed data transmission and break through the limited bottleneck of high resolution satellite imaging data transmission, so it can form a instantaneous transmission of quantum network. In June 2017, Pan Jianwei, the academician of the Chinese Academy of Sciences and Professor Pan Jianwei of the University of Science & Technology China, used the Mo-tse quantum scientific experiment satellite to carry out the experiment. At the communication distance of 1200 kilometers, the average quantum decoy light source on the satellite sent 40 million signal photons per second. The one over orbit docking experiment could generate 300KBs safety. The average bit rate is up to 1.1kb/s. This technology is known as bi-directional quantum entanglement distribution, and its transmission efficiency is 20 orders of magnitude higher than that of the current ground fiber channel at the same distance, that is, to increase trillions of billion times. What is this concept? Its about the distance between a person walking to Mars and the speed of light reaching Mars. In other words, the optical fiber Internet will download a high-definition movie within one second, and the quantum Internet can download hundreds of millions of HD movies in one second. Setting up a prerequisite for quantum networks Quantum interface not only makes information transmission faster and more accurate. The quantum interface developed by Duan Luming team is to ensure accurate docking of the corresponding particles. Because any quantum particle can be entangled by interaction, and the particles are entangled with many environmental particles in the outside world, resulting in noise. In the past, the entanglement produced by particles and the external environment particles was considered uncontrollable. Now, with the quantum interface, the entanglement of the particles can be butted accurately, forming a pure and controllable entanglement, establishing the single line connection of the quantum signal and not interfering with each other. Therefore, this is a foundation for Quantum Internet and quantum communication. Another foundation for building quantum Internet is to build quantum networks. In addition to using beam or laser to transmit quantum information, some scientists have built mixed quantum networks in experiments. However, there is more reason to build pure quantum networks because it is a more secure Internet. The characteristics of quantum communication are inseparable, duplicated and measured, so it is not easy to be deciphered and eavesdropped. Indivisibility makes it impossible for eavesdropper to measure quantum separation. Even forced measurements can leave traces, changing the state of the quantum and exposing the eavesdropping behavior. Moreover, the quantum itself is uncertain. Even if the eavesdropper intercept the quantum, it can not precisely restore the correct quantum state, and get the wrong information. Therefore, quantum network can enable users to communicate in a secure and secure state. With the quantum network and the quantum interface connecting thousands of households, the quantum Internet can be realized. Therefore, the present research has further laid a solid foundation for quantum communication. Zhang Tiankan (scholar) source: Beijing News Editor: Bai Xin _NT4464 However, there is more reason to build pure quantum networks because it is a more secure Internet. The characteristics of quantum communication are inseparable, duplicated and measured, so it is not easy to be deciphered and eavesdropped. Indivisibility makes it impossible for eavesdropper to measure quantum separation. Even forced measurements can leave traces, changing the state of the quantum and exposing the eavesdropping behavior. Moreover, the quantum itself is uncertain. Even if the eavesdropper intercept the quantum, it can not precisely restore the correct quantum state, and get the wrong information. Therefore, quantum network can enable users to communicate in a secure and secure state. With the quantum network and the quantum interface connecting thousands of households, the quantum Internet can be realized. Therefore, the present research has further laid a solid foundation for quantum communication. Zhang Tiankan (scholar)