355 citations · 683 across the 7 of their papers we have counts for
6 papers · 1 filter
Jointly constrained semidefinite bilinear programming with an application to Dobrushin curves
Stefan Huber, Robert Koenig, Marco Tomamichel
We propose a branch-and-bound algorithm for minimizing a bilinear functional of the form \[ f(X,Y) = \mathrm{tr}((X\otimes Y)Q)+\mathrm{tr}(AX)+\mathrm{tr}(BY) , \] of pairs of Her…
The classical capacity of quantum thermal noise channels to within 1.45 bits
Robert Koenig, Graeme Smith
We find a tight upper bound for the classical capacity of quantum thermal noise channels that is within bits of Holevo's lower bound. This lower bound is achievable using…
Post-selection technique for quantum channels with applications to quantum cryptography
Matthias Christandl, Robert Koenig, Renato Renner
We propose a general method for studying properties of quantum channels acting on an n-partite system, whose action is invariant under permutations of the subsystems. Our main resu…
The Bounded Storage Model in The Presence of a Quantum Adversary
Robert Koenig, Barbara M. Terhal
An extractor is a function E that is used to extract randomness. Given an imperfect random source X and a uniform seed Y, the output E(X,Y) is close to uniform. We study properties…
One-and-a-half quantum de Finetti theorems
Matthias Christandl, Robert Koenig, Graeme Mitchison +1
We prove a new kind of quantum de Finetti theorem for representations of the unitary group U(d). Consider a pure state that lies in the irreducible representation U_{mu+nu} for You…
Universally composable privacy amplification against quantum adversaries
Renato Renner, Robert Koenig
Privacy amplification is the art of shrinking a partially secret string Z to a highly secret key S. We show that, even if an adversary holds quantum information about the initial s…