Entanglement is a quintessential quantum mechanical phenomenon with no classical
equivalent. First discussed by Einstein, Podolsky, and Rosen and formally introduced by …

We identify five selected open problems in the theory of quantum information, which are
rather simple to formulate, are well studied in the literature, but are technically not easy. As …

The quantum Cramér-Rao bound for the joint estimation of the centroid and the separation
between two incoherent point sources cannot be saturated. As such, the optimal …

The goal of quantum metrology is to improve measurements' sensitivities by harnessing
quantum resources. Metrologists often aim to maximize the quantum Fisher information …

Relevant metrological scenarios involve the simultaneous estimation of multiple parameters.
The fundamental ingredient to achieve quantum-enhanced performance is based on the use …

We identify the multiparameter sensitivity of entangled spin states, such as spin-squeezed
and Dicke states that are spatially distributed into several addressable spatial modes …

We report an experiment estimating the three parameters of a general rotation. The scheme
uses quantum states attaining the ultimate precision dictated by the quantum Cramér-Rao …

Distributed quantum sensing enables the estimation of multiple parameters encoded in
spatially separated probes. While traditional quantum sensing is often focused on estimating …

Quantum theory allows the traversing of multiple channels in a superposition of different
orders. When the order in which the channels are traversed is controlled by an auxiliary …

The quest for precision in parameter estimation is a fundamental task in different scientific
areas. The relevance of this problem thus provided the motivation to develop methods for …