1] Kuang Yaming Honors School, Nanjing Univeresity, Nanjing, Jiangsu 210093, China [2] Department of Modern Physics and the Collaborative Innovation Center for Quantum Information and Quantum Frontiers, University of Science and Technology of China, Hefei, Anhui 230026, China.
1] Department of Mathematics, Shanghai Jiaotong University, Shanghai 200240, China [2] Department of Physics and Astronomy, University College London, WC1E 6BT London, United Kingdom.
Sci Rep. 2014 Feb 7;4:4036. doi: 10.1038/srep04036.
An essential feature of genuine quantum correlation is the simultaneous existence of correlation in complementary bases. We reveal this feature of quantum correlation by defining measures based on invariance under a basis change. For a bipartite quantum state, the classical correlation is the maximal correlation present in a certain optimum basis, while the quantum correlation is characterized as a series of residual correlations in the mutually unbiased bases. Compared with other approaches to quantify quantum correlation, our approach gives information-theoretical measures that directly reflect the essential feature of quantum correlation.
真正量子关联的一个基本特征是互补基中关联的同时存在。我们通过定义基于基变换不变性的测度来揭示量子关联的这一特征。对于一个两体量子态，经典关联是在某个最优基中存在的最大关联，而量子关联则表现为相互无偏基中的一系列剩余关联。与其他量化量子关联的方法相比，我们的方法给出了直接反映量子关联基本特征的信息论测度。
