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Entropy Uncertainty Relations and Strong Sub-additivity of Quantum Channels
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quant-phmath.OA
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quantumentropychannelsgeneralizedinequalitystronguncertaintyalgebraic
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We prove an entropic uncertainty relation for two quantum channels, extending the work of Frank and Lieb for quantum measurements. This is obtained via a generalized strong super-additivity (SSA) of quantum entropy. Motivated by Petz's algebraic SSA inequality, we also obtain a generalized SSA for quantum relative entropy. As a special case, it gives an improved data processing inequality.
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