量子极化态与经典极化态的比较：当多极计数时
Quantum versus classical polarization states: when multipoles count
摘要：
我们主张一个简单的多极展开的极化密度矩阵。由此产生的多极子被用来构建真正的quasibprobability分布，出现作为一个总和的连续时刻的斯托克斯变量;第一个对应的经典图片上的庞加莱球。我们采用特定的情况下的$Q$功能制定一个完整的层次结构的措施，正确评估高阶极化相关性。
英文摘要：
We advocate for a simple multipole expansion of the polarization density matrix. The resulting multipoles are used to construct bona fide quasiprobability distributions that appear as a sum of successive moments of the Stokes variables; the first one corresponding to the classical picture on the Poincare sphere. We employ the particular case of the $Q$ function to formulate a whole hierarchy of measures that properly assess higher-order polarization correlations.
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