The extraordinary sensitivity of plasmonic sensors is well-known in the optics and photonics
community. These sensors exploit simultaneously the enhancement and the localization of …

The wave-particle duality of light introduces two fundamental problems to imaging, namely,
the diffraction limit and the photon shot noise. Quantum information theory can tackle them …

Quantum metrology is one of the most promising applications of quantum technologies. The
aim of this research field is the estimation of unknown parameters exploiting quantum …

Attaining pure single-photon emission is key for many quantum technologies, from optical
quantum computing to quantum key distribution and quantum imaging. The past 20 years …

The interest in a system often resides in the interplay among different parameters governing
its evolution. It is thus often required to access many of them at once for a complete …

Free electrons are essential in such diverse applications as electron microscopes,
accelerators and photoemission spectroscopy. However, the space charge effects of many …

Only with the simultaneous estimation of multiple parameters are the quantum aspects of
metrology fully revealed. This is due to the incompatibility of observables. The fundamental …

Quantum entanglement and squeezing have significantly improved phase estimation and
imaging in interferometric settings beyond the classical limits. However, for a wide class of …

An array of radiatively coupled emitters provides a platform for generating, storing and
manipulating quantum light. However, the simultaneous positioning and tuning of several …

In the study of quantum limits to parameter estimation, the high dimensionality of the density
operator and that of the unknown parameters have long been two of the most difficult …