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 …

Nonclassical states of light find applications in enhancing the performance of optical
interferometric experiments, with notable example of gravitational-wave detectors. Still, the …

Quantum Machine Learning bridges the gap between abstract developments in quantum
computing and the applied research on machine learning. Paring down the complexity of the …

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 …

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 …

Every restriction on quantum operations defines a resource theory, determining how
quantum states that cannot be prepared under the restriction may be manipulated and used …

We consider process tomography for unitary quantum channels. Given access to an
unknown unitary channel acting on a d-dimensional qudit, we aim to output a classical …

We present a framework for the quantum enhanced estimation of multiple parameters
corresponding to noncommuting unitary generators. Our formalism provides a recipe for the …

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 …