The science of quantum information has arisen over the last two decades centered on the
manipulation of individual quanta of information, known as quantum bits or qubits. Quantum …

There are fundamental limits to the accuracy with which one can determine the state of a
quantum system. I give an overview of the main approaches to quantum state discrimination …

An optimum quantum measurement that minimizes the average probability of error is
considered for symmetric quantum states. The positive operator-valued measure (POM) …

We consider the problem of constructing measurements optimized to distinguish between a
collection of possibly nonorthogonal quantum states. We consider a collection of pure states …

We consider the problem of designing an optimal quantum detector to minimize the
probability of a detection error when distinguishing among a collection of quantum states …

We consider a channel coding for sending classical information through a quantum channel
with a given ensemble of quantum states (letter states). As is well known, it is generically …

We develop a sufficient condition for the least-squares measurement (LSM), or the square-
root measurement, to minimize the probability of a detection error when distinguishing …

Quantum channels can describe all transformations allowed by quantum mechanics. We
adapt two existing works [S. Lloyd and L. Viola, Phys. Rev. A 65, 010101 (2001) PLRAAN …

We analyze the performance of the error probability and the mutual information for
quadrature amplitude modulation (QAM) and phase-shift keying systems based on quantum …

We propose and experimentally demonstrate a near-optimal discrimination scheme for the
quadrature phase shift keying (QPSK) protocol. We show in theory that the performance of …