Quantum observation scheme universally identifying causalities from correlations
Quantum observation scheme universally identifying causalities from correlations
复制标题
量子观测方案普遍从相关性中识别因果关系
DOI:
10.1103/physreva.101.062103
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发表时间:
2020-06
影响因子:
2.9
通讯作者:
Dawei Song
中科院分区:
文献类型:
--
作者:
Chenguang Zhang;Yuexian Hou;Dawei Song
It has long been recognized as a difficult problem to determine whether the observed statistical correlation between two classical variables arise from causality or from common causes. Recent research has shown that in quantum theoretical framework, the mechanisms of entanglement and quantum coherence provide an advantage in tackling this problem. In some particular cases, quantum common causes and quantum causality can be effectively distinguished using observations only. However, these solutions do not apply to all cases. There still exist enormous cases in which quantum common causes and quantum causality can not be distinguished. In this paper, along the line of considering unitary transformation as causality in the quantum world, we formally show quantum common causes and quantum causality are universally separable. Based on the analysis, we further provide a general method to discriminate the two.
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