Hierarchy in temporal quantum correlations

Huan Yu Ku, Shin Liang Chen, Neill Lambert, Yueh Nan Chen, Franco Nori

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Einstein-Podolsky-Rosen (EPR) steering is an intermediate quantum correlation that lies in between entanglement and Bell nonlocality. Its temporal analog, temporal steering, has recently been shown to have applications in quantum information and open quantum systems. Here we show that there exists a hierarchy among the three temporal quantum correlations: temporal inseparability, temporal steering, and macrorealism. Given that the temporal inseparability can be used to define a measure of quantum causality, similarly the quantification of temporal steering can be viewed as a weaker measure of direct cause and can be used to distinguish between direct cause and common cause in a quantum network.

Original languageEnglish
Article number022104
JournalPhysical Review A
Issue number2
Publication statusPublished - 2018 Aug 2

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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