It is a fundamental consequence of the superposition principle for quantum states that there
must exist nonorthogonal states, that is, states that, although different, have a nonzero …

We present, and analyze thoroughly, a highly symmetric and efficient scheme for the
determination of a single-qubit state, such as the polarization properties of photons emitted …

We address the problem of discriminating with minimal error probability two given quantum
operations. We show that the use of entangled input states generally improves the …

Electromagnetically induced transparency (EIT) and Autler-Townes (AT) splitting are two
phenomena that could be featured in a variety of three-level atomic systems. The considered …

The amount of information transmissible through a communications channel is determined
by the noise characteristics of the channel and by the quantities of available transmission …

We consider the problem of discriminating between states of a specified set with maximum
confidence. For a set of linearly independent states unambiguous discrimination is possible …

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 …

The problem of discriminating among given nonorthogonal quantum states is underlying
many of the schemes that have been suggested for quantum communication and quantum …

We present the optimal measurement strategy for distinguishing between three quantum
states exhibiting a mirror symmetry. The three states live in a two-dimensional Hilbert space …

We study the microwave absorption of a driven three-level quantum system, which is
realized by a superconducting flux quantum circuit (SFQC), with a magnetic driving field …