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 …

Quantum-enhanced measurements exploit quantum mechanical effects for increasing the
sensitivity of measurements of certain physical parameters and have great potential for both …

Quantum metrology is one of the most promising applications of quantum technologies. The
aim of this research field is the estimation of unknown parameters exploiting quantum …

Quantum metrology holds the promise of an early practical application of quantum
technologies, in which measurements of physical quantities can be made with much greater …

A few decades ago, quantum optics stood out as a new domain of physics by exhibiting
states of light with no classical equivalent. The first investigations concerned single photons …

The problem of time in quantum gravity calls for a relational solution. Using quantum
reduction maps, we establish a previously unknown equivalence between three approaches …

Genuinely quantum states of a harmonic oscillator may be distinguished from their classical
counterparts by the Glauber-Sudarshan P representation—a state lacking a positive P …

We investigate the ultimate precision achievable in Gaussian quantum metrology. We derive
general analytical expressions for the quantum Fisher information matrix and for the …

Multiparameter estimation is a general problem that aims at measuring unknown physical
quantities, obtaining high precision in the process. In this context, the adoption of quantum …

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 …