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The Two-State-Vector formalism and the Entangled Histories formalism areattempts to better understand quantum correlations in time. The main objectiveof this paper is to show that, with appropriately defined scalar products, bothformalisms can be made isomorphic. We show that they treat operators and stateson equal footing leading to the same statistics for all measurements. Inparticular, we discuss the topic of quantum correlations in time and show howthey can be generated and analyzed in a consistent way in these formalisms.Furthermore, we elaborate on a novel behavior of quantum histories of evolvingmultipartite systems which do not exhibit global non-local correlations in timebut nevertheless can lead to entangled reduced histories characterizingevolution of an arbitrarily chosen sub-system.

Entangled Histories vs. the Two-State-Vector Formalism - Towards a Better Understanding of Quantum Temporal Correlations