ar X iv : q ua nt - p h / 99 11 12 1 v 1 3 0 N ov 1 99 9 Born - Oppenheimer Approximation near Level Crossing

ar X iv : q ua nt - p h / 96 11 02 3 v 1 14 N ov 1 99 6 The Capacity of Quantum Channel with General Signal States

It is shown that the capacity of a classical-quantum channel with arbitrary (possibly mixed) states equals to the maximum of the entropy bound with respect to all apriori distributions. This completes the recent result of Hausladen, Jozsa, Schumacher, Westmoreland and Wooters [5], who proved the equality for the pure state channel. 1. Information and capacity for quantum channel. We start by re...

ar X iv : q ua nt - p h / 99 03 01 5 v 2 2 0 M ar 1 99 9 Disentanglement of pure bipartite quantum states by local cloning

We discuss disentanglement of pure bipartite quantum states within the framework of the schemes developed for entanglement splitting and broadcasting of entanglement. 1 email: [email protected]

ua nt - p h / 99 11 12 1 v 2 2 7 Fe b 20 00 Born - Oppenheimer Approximation near Level Crossing

We consider the Born-Oppenheimer problem near conical intersection in two dimensions. For energies close to the crossing energy we describe the wave function near an isotropic crossing and show that it is related to generalized hypergeometric functions 0 F 3. This function is to a conical intersection what the Airy function is to a classical turning point. As an application we calculate the ano...

ar X iv : q ua nt - p h / 99 12 02 1 v 2 1 9 D ec 1 99 9 Overview of ” Structure behind Mechanics ”

This letter presents a new scenario to solve the structural or conceptual problems remained in quantum mechanics and to reconstruct the basic theory of mechanics. PACS numbers: 03.65.Ca, 03.65.Bz, 11.10.Ef, 02.40.-k

ar X iv : q ua nt - p h / 04 11 17 2 v 1 2 3 N ov 2 00 4 Information and Entropy in Quantum Theory