Physics – Quantum Physics
Scientific paper
2008-04-11
J. Math. Phys. 49, 102107 (2008)
Physics
Quantum Physics
18 pages, 2 figures, typos fixed, introduction expanded
Scientific paper
10.1063/1.2992977
A random unitary channel is one that is given by a convex combination of unitary channels. It is shown that the conjectures on the additivity of the minimum output entropy and the multiplicativity of the maximum output $p$-norm can be equivalently restated in terms of random unitary channels. This is done by constructing a random unitary approximation to a general quantum channel. This approximation can be constructed efficiently, and so it is also applied to the computational problem of distinguishing quantum circuits. It is shown that the problem of distinguishing random unitary circuits is as hard as the problem of distinguishing general mixed state circuits, which is complete for the class of problems that have quantum interactive proof systems.
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