Experimental investigation of classical and quantum correlations under decoherence

Jin-Shi Xu, Xiao-Ye Xu, Chuan-Feng Li (), Cheng-Jie Zhang, Xu-Bo Zou () and Guang-Can Guo
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Jin-Shi Xu: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS
Xiao-Ye Xu: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS
Chuan-Feng Li: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS
Cheng-Jie Zhang: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS
Xu-Bo Zou: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS
Guang-Can Guo: Key Laboratory of Quantum Information, University of Science and Technology of China, CAS

Nature Communications, 2010, vol. 1, issue 1, 1-6

Abstract: Abstract It is well known that many operations in quantum information processing depend largely on a special kind of quantum correlation, that is, entanglement. However, there are also quantum tasks that display the quantum advantage without entanglement. Distinguishing classical and quantum correlations in quantum systems is therefore of both fundamental and practical importance. In consideration of the unavoidable interaction between correlated systems and the environment, understanding the dynamics of correlations would stimulate great interest. In this study, we investigate the dynamics of different kinds of bipartite correlations in an all-optical experimental setup. The sudden change in behaviour in the decay rates of correlations and their immunity against certain decoherences are shown. Moreover, quantum correlation is observed to be larger than classical correlation, which disproves the early conjecture that classical correlation is always greater than quantum correlation. Our observations may be important for quantum information processing.

Date: 2010
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DOI: 10.1038/ncomms1005

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