Derivation of quantum Chernoff metric with perturbation expansion method

作者：Zhong Wei; Ma Jian; Liu Jing; Wang Xiao-Guang^*

来源：Chinese Physics B, 2014, 23(9): 090305.

DOI：10.1088/1674-1056/23/9/090305

• quantum Chernoff metric
• Hellinger distance
• perturbation expansion

We investigate a measure of distinguishability defined by the quantum Chernoff bound, which naturally induces the quantum Chernoff metric over a manifold of quantum states. Based on a quantum statistical model, we alternatively derive this metric by means of perturbation expansion. Moreover, we show that the quantum Chernoff metric coincides with the infinitesimal form of the quantum Hellinger distance, and reduces to the variant version of the quantum Fisher information for the single-parameter case. We also give the exact form of the quantum Chernoff metric for a qubit system containing a single parameter.

• 出版日期2014-9
• 单位浙江大学