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We introduce the informational correlation $E^{AB}$ between two interactingquantum subsystems $A$ and $B$ of a quantum system as the number of arbitraryparameters $\varphi_i$ of a unitary transformation $U^A$ (locally performed onthe subsystem $A$) which may be detected in the subsystem $B$ by the localmeasurements. This quantity indicates whether the state of the subsystem $B$may be effected by means of the unitary transformation applied to the subsystem$A$. Emphasize that $E^{AB}\neq E^{BA}$ in general. The informationalcorrelations in systems with tensor product initial states are studied in moredetails. In particular, it is shown that the informational correlation may bechanged by the local unitary transformations of the subsystem $B$. However,there is some non-reducible part of $E^{AB}(t)$ which may not be decreased byany unitary transformation of the subsystem $B$ at a fixed time instant $t$.Two examples of the informational correlations between two parties of the fournode spin-1/2 chain are studied.

Informational correlation between two parties of a quantum system: short spin-1/2 chains with XY Hamiltonian