We show that the theory of operator quantum error correction can be naturally generalized by allowing constraints not only on states but also on observables. The resulting theory describes the… (More)

Quantum f -divergences are a quantum generalization of the classical notion of f divergences, and are a special case of Petz’ quasi-entropies. Many well-known distinguishability measures of quantum… (More)

We study the approximate correctability of general algebras of observables, which represent hybrid quantum-classical information. This includes approximate quantum error correcting codes and… (More)

We derive necessary and sufficient conditions for the approximate correctability of a quantum code, generalizing the Knill-Laflamme conditions for exact error correction. Our measure of success of… (More)

We derive simple necessary and sufficient conditions under which a quantum channel obtained from an arbitrary perturbation from the identity can be reversed on a given code to the lowest order in… (More)

Information-theoretical quantities such as statistical distinguishability typically result from optimisations over all conceivable observables. Physical theories, however, are not generally… (More)

By allowing to measure the magnetic field distribution inside a material, muon spin rotation experiments have the potential to provide valuable information about microscopic properties of… (More)

Diamond crystal S and p01 ycrystal l i ne diamond fi lms have been depos i e y t h e microwave plasma ass i s t ed C V D method from C H / H mixtures. The i n: :oncentration of methane, the pressure,… (More)

Beam dynamics applications and components of the beamline experimental controls system at the Swiss Light Source (SLS) have benefitted from a distributed and heterogeneous computing environment in… (More)