In parameter estimation, nuisance parameters refer to parameters that are not of interest but
nevertheless affect the precision of estimating other parameters of interest. For instance, the …

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 …

The purpose of quantum technologies is to explore how quantum effects can improve on
existing solutions for the treatment of information. Quantum photonics sensing holds great …

Quantum sensing is one of the arenas that exemplifies the superiority of quantum
technologies over their classical counterparts. Such superiority, however, can be diminished …

Phase estimation, at the heart of many quantum metrology and communication schemes,
can be strongly affected by noise, whose amplitude may not be known, or might be subject …

The measurement problem for the optical phase has been traditionally attacked for
noiseless schemes or in the presence of amplitude or detection noise. Here we address the …

Quantum metrology protocols allow us to surpass precision limits typical to classical
statistics. However, in recent years, no-go theorems have been formulated, which state that …

The laws of quantum mechanics allow to perform measurements whose precision
supersedes results predicted by classical parameter estimation theory. That is, the precision …

We propose a computationally efficient method to derive the unitary evolution that a
quantum state is most sensitive to. This allows one to determine the optimal use of an …

A generic qubit unitary operator affected by depolarizing noise is duplicated and inserted in
a quantum switch process, realizing a superposition of causal orders. The characterization …