What multi-node network has achieved fundamental breakthroughs?

Multi-node "quantum" network has achieved fundamental breakthroughs. Academician of the Chinese Academy of Sciences, Professor Pan Jianwei of the University of Science and Technology of China, Professor Bao Xiaohui and others have made important progress in the study of quantum networks. They have successfully used multi-photon interference to entangle three separated cold atom quantum memories, laying the foundation for the construction of multi-node, long-distance quantum memories. The web laid the foundation.

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Chinese scholars have made fundamental breakthroughs in research on "multi-node quantum networks"

Academician of the Chinese Academy of Sciences, Professor Pan Jianwei of the University of Science and Technology of China, Professor Bao Xiaohui and others have studied quantum networks Important progress has been made, and multi-photon interference has been successfully used to entangle three separated cold-atom quantum memories, laying the foundation for building a multi-node, long-distance quantum network. The authoritative international academic journal "Nature Photonics" recently published this result, and the reviewer believed it was "a milestone in multi-node quantum network research."

Corresponding to the existing electronic computer network, quantum network refers to the interconnection between remote quantum processors. According to the degree of development, it can be divided into three types: quantum key network, quantum storage network and quantum computing network. stage.

Due to the important application value of quantum networks, international scientific and technological competition is very fierce. At present, quantum key networks are relatively mature and are entering large-scale applications, such as the "Beijing-Shanghai Trunk Line" for quantum secure communication that has been built in my country. In terms of the next stage of quantum storage networks, the current main scientific research goals are to expand the number of nodes and increase the distance between nodes.

The basic resource for building a quantum storage network is the quantum entanglement between light and atoms. The brightness and quality of the entanglement determine the scale and scale of the quantum network.

Based on the entanglement of high-brightness light and atoms, researchers successfully entangled three atomic ensemble quantum memories by preparing multiple pairs of entanglements and using 3-photon interference.

The three quantum memories in the experiment are located in two independent laboratories, connected by an 18-meter single-mode optical fiber. According to the researchers, combined with relevant new storage and entanglement technologies, they are expected to further increase the number of nodes in the future; using quantum frequency conversion technology to convert atomic wavelengths to the communication band is also expected to significantly expand the distance between nodes.

Extended information:

Quantum entanglement Quantum theory researchers have long discovered the key to quantum communication - quantum entanglement. Quantum entanglement describes such a phenomenon: two microscopic particles are located on both sides of the universe. No matter how far apart they are, as long as the two particles are quantum entangled with each other, by changing the quantum state of one particle, the other particle can be caused to be very far away. The state of one particle also changes, and the signal transcends the barriers of time and space and is sent directly to another particle.

This magical phenomenon is very similar to what we call "telepathy" in our lives. Two people who are far apart want to do the same thing at the same time, as if there is an invisible string holding them. personal.

This theoretically superior communication method has aroused the ambition of quantum scientists, who are trying to build a quantum network that is tens of millions of times faster than the current Internet.

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