Quantum metrology studies the ultimate limit of precision in estimating a physical quantity if
quantum strategies are exploited. Here we investigate the evolution of a two-level atom as a …

We investigate the ultimate estimation precision, characterized by the quantum Fisher
information, of a two-level atom as a detector which is coupled to massless scalar field in the …

We study the quantum metrology for a pair of entangled Unruh-Dewitt detectors when one of
them is accelerated and coupled to a massless scalar field. Comparing with previous …

We address the issue of precisely estimating small parameters encoded in a general linear
transformation of the modes of a bosonic quantum field. Such Bogoliubov transformations …

We study the parameter estimation for excitations of Dirac fields in the expanding Robertson–
Walker universe. We employ quantum metrology techniques to demonstrate the possibility …

We probe the κ κ-deformation of spacetime using a two-level atom as a detector coupled to a
κ κ-deformed massless scalar field which is invariant under a κ κ-Poincaré algebra and …

We describe a quantum limit to the measurement of classical spacetimes. Specifically, we
formulate a quantum Cramér-Rao lower bound for estimating the single parameter in any …

We address the quantum estimation of parameters encoded into the initial state of two
modes of a Dirac field described by relatively accelerated parties. By using the quantum …

It has recently been reported that, under an operational definition of time, quantum clocks
would get entangled through gravitational effects. Here, an alternative scenario is studied …

We firstly revisit the importance, naturalness and limitations of the so-called optical metrics
for describing the propagation of light rays in the limit of geometric optics. We then exemplify …