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- University of OxfordGB31 papers
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22 papers · 2 filters
Entanglement-Enhanced Quantum Key Distribution
Olli Ahonen, Mikko Mottonen, Jeremy L. O'Brien
We present and analyze a quantum key distribution protocol based on sending entangled N-qubit states instead of single-qubit ones as in the trail-blazing scheme by Bennett and Bras…
Counterexamples to additivity of minimum output p-Renyi entropy for p close to 0
Toby Cubitt, Aram W. Harrow, Debbie Leung +2
Complementing recent progress on the additivity conjecture of quantum information theory, showing that the minimum output p-Renyi entropies of channels are not generally additive f…
The de Finetti theorem for test spaces
Jonathan Barrett, Matthew Leifer
We prove a de Finetti theorem for exchangeable sequences of states on test spaces, where a test space is a generalization of the sample space of classical probability theory and th…
Assessing non-Markovian dynamics
M. M. Wolf, J. Eisert, T. S. Cubitt +1
We investigate what a snapshot of a quantum evolution - a quantum channel reflecting open system dynamics - reveals about the underlying continuous time evolution. Remarkably, from…
Higher entropic uncertainty relations for anti-commuting observables
Stephanie Wehner, Andreas Winter
Uncertainty relations lie at the very core of quantum mechanics, and form the cornerstone of essentially all quantum cryptographic applications. In particular, they play an importa…
Composable Security in the Bounded-Quantum-Storage Model
Stephanie Wehner, Jürg Wullschleger
We present a simplified framework for proving sequential composability in the quantum setting. In particular, we give a new, simulation-based, definition for security in the bounde…