We consider the problem of reversing quantum dynamics, with the goal of preserving an initial state’s quantum entanglement or classical correlation with a reference system. We exhibit an approximate… Expand

A non-interactive scheme that enables A to both encrypt and authenticate an m qubit message by encoding it into m+s qubits, where the error probability decreases exponentially in the security parameter s, and a lower bound of 2m key bits for authenticating m qubits is given, which makes the protocol asymptotically optimal.Expand

It is shown that different applications may result in different channel capacities, and upper bounds on several of these capacities are proved based on the coherent information, which plays a role in quantum information theory analogous to that played by the mutual information in classical information theory.Expand

For finite-dimensional bipartite quantum systems, we find the exact size of the largest balls, in spectral ${l}_{p}$ norms for $1l~pl~\ensuremath{\infty},$ of separable (unentangled) matrices around… Expand

Are you looking to uncover the beginning of infinity explanations that transform the world Digitalbook. Correct here it is possible to locate as well as download the beginning of infinity… Expand

We present a new characterization of quantum theory in terms of simple physical principles that is different from previous ones in two important respects: first, it only refers to properties of… Expand

It is shown that a restricted class of encodings is sufficient to transmit any quantum source which may be transmitted on a given channel, and that the availability of an auxiliary classical channel from encoder to decoder does not increase the quantum capacity.Expand

A quantum algorithm that solves combinatorial optimization problems by quantum simulation of a classical simulated annealing process by exploiting quantum walks and the quantum Zeno effect induced by evolution randomization is described.Expand

We show that for an m-partite quantum system, there is a ball of radius 2{sup -(m/2-1)} in Frobenius norm, centered at the identity matrix, of separable (unentangled) positive semidefinite matrices.… Expand