We show that two quantities in quantum metrology that were thought to be the same, the
quantum Fisher information matrix and the Bures metric, are not the same. They differ at …

We investigate the interplay between gravity and the quantum coherence present in the
state of a pulse of light propagating in curved spacetime. We first introduce an operational …

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 how quantum systems that propagate in the spacetime of a rotating planet are
affected by the curved background. Spacetime curvature affects wavepackets of photons …

We consider quantum communication schemes where quantum optical signals are
exchanged between a source on Earth and a satellite. The background curved spacetime …

Spacetime curvature of the Earth deforms wave packets of photons sent from the Earth to
satellites, thus influencing the quantum state of light. We show that Gaussian steering of …

We address the estimation of the number of photons and temperature in a micromaser-type
system with Fock state and thermal fields. We analyze the behavior of the quantum Fisher …

Light wave-packets propagating from the Earth to satellites will be deformed by the curved
background spacetime of the Earth, thus influencing the quantum state of light. We show that …

The preparation of quantum systems and the execution of quantum information tasks
between distant users are always affected by gravitational and relativistic effects. In this …

We investigate the use of a nonlinear optical interferometer to estimate local gravitational
acceleration. We study a Mach–Zehnder interferometer (MZI) in an optical fountain …