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- International Solvay InstitutesBE71 papers
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5 papers · 2 filters
Symmetry-assisted adversaries for quantum state generation
Andris Ambainis, Loïck Magnin, Martin Roetteler +1
We introduce a new quantum adversary method to prove lower bounds on the query complexity of the quantum state generation problem. This problem encompasses both, the computation of…
Secure device-independent quantum key distribution with causally independent measurement devices
Lluis Masanes, Stefano Pironio, Antonio Acin
Device-independent quantum key distribution aims to provide key distribution schemes whose security is based on the laws of quantum physics but which does not require any assumptio…
A family of loss-tolerant quantum coin flipping protocols
N. Aharon, S. Massar, J. Silman
We present a family of loss-tolerant quantum strong coin flipping protocols; each protocol differing in the number of qubits employed. For a single qubit we obtain a bias of 0.4, r…
Mutually Unbiased Bases and Semi-definite Programming
Stephen Brierley, Stefan Weigert
A complex Hilbert space of dimension six supports at least three but not more than seven mutually unbiased bases. Two computer-aided analytical methods to tighten these bounds are…
Symmetry, Compact Closure and Dagger Compactness for Categories of Convex Operational Models
Howard Barnum, Ross Duncan, Alexander Wilce
In the categorical approach to the foundations of quantum theory, one begins with a symmetric monoidal category, the objects of which represent physical systems, and the morphisms…