Superactivation of the Asymptotic Zero-Error Classical Capacity of a Quantum Channel

Authors:
Toby S. Cubitt;Jianxin Chen;Aram W. Harrow
Affiliations:
Departamento de Análisis Matemático, Universidad Complutense de Madrid, Madrid, Spain;Department of Mathematics & Statistics, University of Guelph, Guelph, Canada;Dept. of Comp. Sci. & Eng., U. of Washington, Seattle, WA, USA
Venue:
IEEE Transactions on Information Theory
Year:
2011

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Abstract

The zero-error classical capacity of a quantum channel is the asymptotic rate at which it can be used to send classical bits perfectly so that they can be decoded with zero probability of error. We show that there exist pairs of quantum channels, neither of which individually have any zero-error capacity whatsoever (even if arbitrarily many uses of the channels are available), but such that access to even a single copy of both channels allows classical information to be sent perfectly reliably. In other words, we prove that the zero-error classical capacity can be superactivated. This result is the first example of superactivation of a classical capacity of a quantum channel.