This review aims at gathering the most relevant quantum multi-parameter estimation
methods that go beyond the direct use of the quantum Fisher information concept. We …

Quantum metrology can achieve far better precision than classical metrology, and is one of
the most important applications of quantum technologies in the real world. To attain the …

The interest in a system often resides in the interplay among different parameters governing
its evolution. It is thus often required to access many of them at once for a complete …

Quantum parameter estimation promises a high-precision measurement in theory; however,
how to design the optimal scheme in a specific scenario, especially under a practical …

Quantum technologies exploit entanglement to enhance various tasks beyond their classical
limits including computation, communication and measurements. Quantum metrology aims …

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

Quantum Fisher information matrix (QFIM) is a cornerstone of modern quantum metrology
and quantum information geometry. Apart from optimal estimation, it finds applications in …

We study quantum frequency estimation for N qubits subjected to independent Markovian
noise, via strategies based on time-continuous monitoring of the environment. Both physical …

We show that quantification of the performance of quantum-enhanced measurement
schemes based on the concept of quantum Fisher information (QFI) yields results that are …

Under ideal conditions, quantum metrology promises a precision gain over classical
techniques scaling quadratically with the number of probe particles. At the same time, no-go …