Critical quantum metrology relies on the extreme sensitivity of a system's eigenstates near
the critical point of a quantum phase transition to Hamiltonian perturbations. This means that …

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 …

This work compares the performance of single-and two-qubit probes for estimating several
phase rotations simultaneously under the action of different noisy channels. We compute the …

Polarization is one of light's most versatile degrees of freedom for both classical and
quantum applications. The ability to measure light's state of polarization and changes …

One key aspect of quantum metrology, measurement incompatibility, is evident only through
the simultaneous estimation of multiple parameters. The symmetric logarithmic derivative …

Quantum phase estimation is fundamental to advancing quantum science and technology.
While much of the research has concentrated on estimating a single phase, the …

In quantum multi-parameter estimation, the uncertainty in estimating unknown parameters is
lower-bounded by Cram\'{e} r-Rao bound (CRB), defined as an inverse of the Fisher …

Recently a widely used computation expression for quantum Fisher information was shown
to be discontinuous at the parameter points where the rank of the parametric density …

In this paper we address a special case of'sloppy'quantum estimation procedures which
happens in the presence of intertwined parameters. A collection of parameters are said to be …

Estimating transmission or loss is at the heart of spectroscopy. To achieve the ultimate
quantum resolution limit, one must use probe states with definite photon number and …