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 …

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 …

Combining quantum and Bayesian principles leads to optimality in metrology, but the
optimization equations involved are often hard to solve. This Letter mitigates this problem …

The objective of the proposed macroscopic quantum resonators (MAQRO) mission is to
harness space for achieving long free-fall times, extreme vacuum, nano-gravity, and …

Many quantum statistical models are most conveniently formulated in terms of non-
orthogonal bases. This is the case, for example, when mixtures and superpositions of …

We make use of the powerful formalism of quantum parameter estimation to assess the
characteristic rates of a continuous spontaneous localization (CSL) model affecting the …

Quantum-enhanced sensing promises to improve the performance of sensing tasks using
nonclassical probes and measurements that require far fewer scene-modulated photons …

Spontaneous wavefunction collapse theories provide the possibility to resolve the
measurement problem of quantum mechanics. However, the best experimental tests have …

Space offers exciting opportunities to test the foundations of quantum physics using
macroscopic quantum superpositions. It has been proposed to perform such tests in a …

The objective of the proposed MAQRO mission is to harness space for achieving long free-
fall times, extreme vacuum, nano-gravity, and cryogenic temperatures to test the foundations …