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Review on quantum discord of bipartite and multipartite systems |
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PP: 69-77 |
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Author(s) |
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Jian-Song Zhang,
Ai-Xi Chen,
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Abstract |
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| Quantum information and computation, based on quantum correlations of quantum systems, is one of the promising new
fields of physics and information science. Entanglement is the key resource of quantum information processing. However, it is shown
recently that quantum entanglement is not the only kind of quantum correlations useful for quantum information processing. Quantum
systems without any entanglement can still be helpful for quantum information processing since unentangled systems could have
another kind of quantum correlations – quantum discord. Thus, quantum discord has drawn much attention in recent years. Here, we
briefly review the concepts and properties of quantum discord. Several measures of discord including the original measure of discord,
relative entropy-based discord, geometric discord, global discord, Gaussian discord, are reviewed and discussed. |
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