Quantum Fisher information matrix (QFIM) is a core concept in theoretical quantum
metrology due to the significant importance of quantum Cramér–Rao bound in quantum …

In both classical and quantum many-body physics, it is a core issue to characterize statistical
correlations among different degrees of freedom. From this point of view, a natural question …

Abstract The Einstein-Podolsky-Rosen (EPR) paradox plays a fundamental role in our
understanding of quantum mechanics, and is associated with the possibility of predicting the …

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 expand the toolbox for studying Bell correlations in multipartite systems by introducing
permutationally invariant Bell inequalities (PIBIs) involving few-body correlators. First, we …

Magnons, as fundamental quasiparticles that emerge in elementary spin excitations, hold a
big promise for innovating quantum technologies in information coding and processing. By …

We demonstrate that the many-body nonlocality witnessed by a broad family of Bell
inequalities is a resource for ultraprecise metrology. We formulate a general scheme which …

Quantum mechanics offers the possibility of unconditionally secure communication between
multiple remote parties. Security proofs for such protocols typically rely on bounding the …

We introduce a permutationally invariant multipartite Bell inequality for many-body three-
level systems and use it to explore a possible connection between the presence of …

We analyze the conditional states in which one part of a split spin-squeezed state is left,
upon performing a collective spin measurement on the other part. For appropriate …