【摘 要】
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We introduce the concentrated information of tripartite quantum states.For three parties Alice,Bob,and Charlie,it is defined as the maximal mutual informati
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We introduce the concentrated information of tripartite quantum states.For three parties Alice,Bob,and Charlie,it is defined as the maximal mutual information achievable between Alice and Charlie via local operations and classical communication performed by Charlie and Bob.The gap between classical and quantum concentrated information is proven to be an operational figure of merit for a state merging protocol involving shared mixed states and no distributed entanglement.We derive upper and lower bounds on the concentrated information,and obtain a closed expression for arbitrary pure tripartite states in the asymptotic setting.We show that distillable entanglement,entanglement of assistance,and quantum discord can all be expressed in terms of the concentrated information,revealing the fundamental role of this concept in quantum information theory.(Joint work with Alexander Streltsov and Gerardo Adesso.)
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