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Catalytic decoupling of quantum information

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MAJENZ Christian BERTA Mario DUPONT DUPUIS Frédéric RENNER Renato CHRISTANDL Matthias

Druh Článek v odborném periodiku
Časopis / Zdroj Physical Review Letters
Fakulta / Pracoviště MU

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Citace
Doi http://dx.doi.org/10.1103/PhysRevLett.118.080503
Obor Teorie informace
Klíčová slova quantum information; information theory
Popis The decoupling technique is a fundamental tool in quantum information theory with applications ranging from thermodynamics to many-body physics and black hole radiation whereby a quantum system is decoupled from another one by discarding an appropriately chosen part of it. Here, we introduce catalytic decoupling, i.e., decoupling with the help of an independent system. Thereby, we remove a restriction on the standard decoupling notion and present a tight characterization in terms of the max-mutual information. The novel notion unifies various tasks and leads to a resource theory of decoupling.
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