All our former experience with application of quantum theory seems to say that what is
predicted by quantum formalism must occur in the laboratory. But the essence of quantum …

Multiphoton interference reveals strictly nonclassical phenomena. Its applications range
from fundamental tests of quantum mechanics to photonic quantum information processing …

We provide necessary and sufficient conditions for separability of mixed states of n-particle
systems. The conditions are formulated in terms of maps which are positive on product …

The “entanglement of formation” of a mixed state ρ of a bipartite quantum system can be
defined as the minimum number of singlets needed to create an ensemble of pure states …

Quantum information theory is a branch of science at the frontier of physics, mathematics,
and information science, and offers a variety of solutions that are impossible using classical …

The question of how many entangled or, respectively, separable states there are in the set of
all quantum states is considered. We propose a natural measure in the space of density …

The superposition principle plays the most central role in all considerations of quantum
information, and in most of the" gedanken" experiments and even the paradoxes of quantum …

It is shown that any separable state on the Hilbert space H= H 1⊗ H 2 can be written as a
convex combination of N pure product states with N≤(dimH) 2. Then a new separability …

We improve previously proposed conditions each measure of entanglement has to satisfy.
We present a class of entanglement measures that satisfy these conditions and show that …

We propose a scheme for using an unmodulated and unmeasured spin chain as a channel
for short distance quantum communications. The state to be transmitted is placed on one …