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We study an arbitrary non-equilibrium dynamics of a quantum bipartite systemcoupled to a reservoir. For its characterization, we present a fluctuationtheorem (FT) that explicitly addresses the quantum correlation of subsystemsduring the thermodynamic evolution. To our aim, we designate the local and theglobal states altogether in the time-forward and the time-reversed transitionprobabilities. In view of the two-point measurement scheme, only the globalstates are subject to measurements whereas the local states are used only as anaugmented information on the composite system. We specifically derive a FT insuch a form that relates the entropy production of local systems in thetime-forward transition to the change of quantum correlation in thetime-reversed transition. This also leads to a useful thermodynamic inequalityand we illustrate its advantage by an example of an isothermal process onWerner states.

Information Fluctuation Theorem for an Open Quantum Bipartite System