News flash:
On May 24, reporters learned from the University of Science and Technology of China that the university's Quantum Physics and Quantum Information Laboratory, led by Professor Pan Jianwei, recently made important progress in the experimental field of quantum communication. They successfully achieved concentration of quantum entangled states, and by using this technology, for the first time internationally they experimentally realized the most critical unit device in long-distance quantum communication — the quantum repeater, laying the foundation for future long-distance quantum communication. On the 23rd, the authoritative international physics journal Physical Review Letters published their research results, "Experimental Realization of Quantum Entanglement Concentration and Quantum Repeater." On the 22nd, the British journal Nature also published, as a cover article, a paper by Dr. Pan Jianwei and his colleagues titled "Experimental Research on Purification of Arbitrary Entangled States."
As an emerging discipline still under development, quantum communication technology is more effective than the communication methods now widely in use, and can achieve complete secrecy in the true sense. In recent years, a series of major breakthroughs have been made internationally in the experimental field of quantum communication. It has already become possible to successfully verify quantum cryptography, quantum dense coding, and teleportation of quantum states by using single-photon sources or entangled photon pairs. However, the above schemes have only been realized within the short-distance range of quantum communication (tens of kilometers). There are still serious difficulties for mankind to carry out long-distance quantum communication, and the biggest obstacle is that the unavoidable photon loss and decoherence effects in the communication channel cannot be overcome.
Theoretical research has already shown that people can effectively overcome this difficulty by using entanglement swapping and entanglement purification techniques. And the quantum repeater, as a combination of the two, has been called by internationally renowned physicists Zo lle r and G is in and others "the hope for realizing long-distance quantum communication in the future." A reviewer for Physical Review Letters believed that Pan Jianwei and others' research result "very timely reports the experimental realization of the quantum repeater, and it constitutes an important advance in the experimental field of long-distance quantum communication."
Because the probability of simultaneously producing two pairs of entangled photon pairs in experiments is very low, experimental verification of the quantum repeater has always been a major difficult problem in the international experimental field of quantum information. After long-term research, the Quantum Physics and Quantum Information Laboratory led by Professor Pan Jianwei obtained, in the autumn of 2002, the brightest entangled-pair source in the world. Using this entangled-state source, the researchers in the laboratory successfully developed a four-photon entanglement source with a brightness one hundred times higher than the previous world record, and on this basis realized quantum entanglement concentration and the quantum repeater. Scientists believe this research result will become a basic tool in the future realization of long-distance quantum communication.
On May 24, reporters learned from the University of Science and Technology of China that the university's Quantum Physics and Quantum Information Laboratory, led by Professor Pan Jianwei, recently made important progress in the experimental field of quantum communication. They successfully achieved concentration of quantum entangled states, and by using this technology, for the first time internationally they experimentally realized the most critical unit device in long-distance quantum communication — the quantum repeater, laying the foundation for future long-distance quantum communication. On the 23rd, the authoritative international physics journal Physical Review Letters published their research results, "Experimental Realization of Quantum Entanglement Concentration and Quantum Repeater." On the 22nd, the British journal Nature also published, as a cover article, a paper by Dr. Pan Jianwei and his colleagues titled "Experimental Research on Purification of Arbitrary Entangled States."
As an emerging discipline still under development, quantum communication technology is more effective than the communication methods now widely in use, and can achieve complete secrecy in the true sense. In recent years, a series of major breakthroughs have been made internationally in the experimental field of quantum communication. It has already become possible to successfully verify quantum cryptography, quantum dense coding, and teleportation of quantum states by using single-photon sources or entangled photon pairs. However, the above schemes have only been realized within the short-distance range of quantum communication (tens of kilometers). There are still serious difficulties for mankind to carry out long-distance quantum communication, and the biggest obstacle is that the unavoidable photon loss and decoherence effects in the communication channel cannot be overcome.
Theoretical research has already shown that people can effectively overcome this difficulty by using entanglement swapping and entanglement purification techniques. And the quantum repeater, as a combination of the two, has been called by internationally renowned physicists Zo lle r and G is in and others "the hope for realizing long-distance quantum communication in the future." A reviewer for Physical Review Letters believed that Pan Jianwei and others' research result "very timely reports the experimental realization of the quantum repeater, and it constitutes an important advance in the experimental field of long-distance quantum communication."
Because the probability of simultaneously producing two pairs of entangled photon pairs in experiments is very low, experimental verification of the quantum repeater has always been a major difficult problem in the international experimental field of quantum information. After long-term research, the Quantum Physics and Quantum Information Laboratory led by Professor Pan Jianwei obtained, in the autumn of 2002, the brightest entangled-pair source in the world. Using this entangled-state source, the researchers in the laboratory successfully developed a four-photon entanglement source with a brightness one hundred times higher than the previous world record, and on this basis realized quantum entanglement concentration and the quantum repeater. Scientists believe this research result will become a basic tool in the future realization of long-distance quantum communication.
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