Catalytic Decoupling of Quantum Information

TY - JOUR

T1 - Catalytic Decoupling of Quantum Information

AU - Majenz, Christian

AU - Berta, Mario

AU - Dupuis, Frédéric

AU - Renner, Renato

AU - Christandl, Matthias

PY - 2017/2/23

Y1 - 2017/2/23

N2 - 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.

AB - 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.

KW - quant-ph

U2 - 10.1103/physrevlett.118.080503

DO - 10.1103/physrevlett.118.080503

M3 - Journal article

C2 - 28282182

SN - 0031-9007

VL - 118

JO - Physical Review Letters

JF - Physical Review Letters

IS - 8

M1 - 080503

ER -