Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 43: Quantum Information: Concepts and Methods VI
Q 43.5: Talk
Wednesday, March 25, 2015, 15:30–15:45, K/HS1
Concentrating Information — •Alexander Streltsov1, Soojoon Lee2, and Gerardo Adesso3 — 1ICFO, Castelldefels (Barcelona), Spain — 2Kyung Hee University, Seoul, Korea — 3University of Nottingham, Nottingham, United Kingdom
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 shown 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. In this situation, one-way classical communication is shown to be sufficient for optimal information concentration.