The statistical error in any estimation can be reduced by repeating the measurement and
averaging the results. The central limit theorem implies that the reduction is proportional to …

Quantum mechanics, through the Heisenberg uncertainty principle, imposes limits on the
precision of measurement. Conventional measurement techniques typically fail to reach …

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 …

We point out a general framework that encompasses most cases in which quantum effects
enable an increase in precision when estimating a parameter (quantum metrology). The …

Recently, there has been much interest in a new kind of “unspeakable” quantum information
that stands to regular quantum information in the same way that a direction in space or a …

The simultaneous quantum estimation of multiple parameters can provide a better precision
than estimating them individually. This is an effect that is impossible classically. We review …

This book is the revised English edition of the Japanese book Introduction to Quantum
Information Theory, which systematically describes quantum information theory and was …

Simultaneous estimation of multiple parameters in quantum metrological models is
complicated by factors relating to the (i) existence of a single probe state allowing for optimal …

We study multiparameter sensing of two-dimensional (2D) and three-dimensional (3D)
vector fields within the Bayesian framework for SU (2) quantum interferometry. We establish …

We present a method for optimizing quantum circuits architecture, based on the notion of a
quantum comb, which describes a circuit board where one can insert variable subcircuits …