Major Breakthrough in Quantum Information Research at USTC

  • Major Breakthrough in Quantum Information Research at USTC
    update:2010-04-29

        On April 20, 2010, the inaugural issue of Nature Communications published the research results from the CAS Key Laboratory of Quantum Information (KLOQI) led by USTC Professor and Academician Guo Guangcan. In their study of classical and quantum correlations under environmental decoherence, they found for the first time that it is possible for quantum correlation not to be destroyed by the environment. This was the third of a series of major findings reported by the lab in a period of four months. The other two had been published earlier in the world-renowned Physical Review Letters.

        It has always been a challenge for researchers to solve the problem of environmental destruction of quantum correlations which are fragile as an important resource in quantum communications and quantum computing. In their research, the group headed by Dr. Li Chuanfeng at KLOQI prepared various Bell diagonal states in optical systems, performed their transmission as initial states under environmental decoherence, and experimentally investigated the evolution of correlations. They were the first in the world to discover an initial state whose quantum correlation is not destroyed in a wide-ranging area of decoherence and is referred to as a quantum correlation without a subspace of decoherence. They also verified the sudden change in quantum and classical correlations in the evolution of decoherence and demonstrated that, during the evolution of certain special initial states, quantum correlation might be larger than classical correlation, thereby disproving the early conjecture that classical correlation is always greater than quantum correlation. Their findings will greatly facilitate the physical study and related applications of quantum correlations, and deepen the investigation into quantum correlation without a subspace of decoherence and sudden change in the evolution of correlations.
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On May 11, the Nature Publishing Group released Nature Publishing Index 2010 China, remarking “a dramatic rise in the quality of research being published by China”. University of Science and Technology of China is ranked 3rd of TOP 10 Institutions in Index 2010 China.

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